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Re: Breaking carbide inserts parting off?
Parting in the front tool post on relatively small or light lathes can be a pain. I have a Myford ML7 at home. It's in nice nick, and I have NEVER succeeded in parting at the front. The tool digs in and snaps pretty well as soon as it touches. Fortunately, I have a rear toolpost that works a treat. If you look at a manual capstan lathe, parting is ALWAYS done from the back. I have recently acquired a rear toolpost for the railway's Colchester Triumph 2000 (AKA Clausing 15") and that will happily run a 4mm HSS blade. Internal screwcutting has now been promoted to my most feared operation in place of parting (I have to make 3 off 1 1/8 BSP nuts for steam pipe unions as soon as the 1 7/8 A/F Hex leaded gunmetal turns up).
The tool needs to be absolutely sharp. If you need to apply an increasing force to drive it in, that is a recipe for disaster.
If a hand ground blade, polish with a diamond file.
The tool must be narrow, and the smaller the lathe, the narrower the tool. I front part successfully with carbide on our 14.5" SB with taper turning attachment because that won't conveniently take a rear toolpost, but wouldn't use anything wider than a 3mm cutter. It is, nonetheless, nerve wracking.
If you look at (e.g.) the Iscar catalogue you will see dozens of different chip geometries on the same size of tip. Pick one with the correct geometry for the material you are cutting.
Work support is vital. Cut at no more than 1/4 diameter distance from the chuck or collet, and ensure they are TIGHT. Ensure there is at least 1.5 x diameter still in the chuck. If not, add a centre at the outer end whether you think it needs it or not. Neglect of any of this could result in the job deflecting badly in the chuck (etc.).
Trace and rectify any source of toolpost deflection under load. Have the compound slide set so that the sliding part is not overhanging the fixed part, and ensure that the leading corner of the toolpost is over solid metal. With the job moving downwards as in front cutting, any deflection results in the tool moving into the job, increasing the cutting force, which increases the deflection etc. With the job moving upwards as in rear cutting, the tool tends to deflect away from the job (phew!) This is why folk construct tool props for front parting.
On small lathes, part off at a relatively low speed, regardless of tool type.
Not sure about small quantities of cutting oil, but if parting something that normally takes coolant, even if optional, I would use coolant flow during parting, if available. Obviously not for cast iron or cheap brass.
Parting in stages that create a swarf anti jamming gap as described by someone else works well, especially if using the sort of carbide tip that is moulded to curl the edges of the swarf inwards and you are cutting material that produces springy swarf in spiral coils. That stuff can spring out towards flat as soon as it leaves the tip, and jam in the groove. Intermittent cutting helps by breaking that sort of swarf into shorter coils.
The cross feed during parting generally needs to be done manually, and slower than the slowest available powered feed.
I think that's all for the moment.
Eddie
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------ Original Message ------
From: "mike allen" <animal@...>
To: [email protected]
Cc: [email protected]
Sent: Friday, 21 Apr, 23 At 20:31
Subject: Re: [SouthBendLathe] Breaking carbide inserts parting off?
They have a rear mounted parting tool tool post they also sell . I should buy the crossslide & just have it here for when I'm ready to make one . I need to learn dovetails first . Rear Tool Post animal
On 4/21/2023 12:20 PM, Nick Andrews wrote:
This is on my 11" Sheldon lathe. No, haven't tried snugging the gibs but did lock the saddle. I guess if I am taking the time to make something, tweaking the gibs shouldn't seem like such a chore...
Interesting casting. Do you then just bolt your tool post on directly somehow?
On Fri, Apr 21, 2023 at 1:49?PM mike allen < animal@...> wrote: I've seen some of those parting tool supports that folks make on youtube in the past . Folks seem to like them , but then again its the guy that made it that says its bitchin . These folks make a longer crossslide casting that you machine to finish that allows you to put a tool post behind the work so your parting tool is mounted upside down , some folks say this is a huge improvement when parting . This is one of my projects on my list to make sometime . Are you locking the saddle & tightening the crossslide & compound gibs when parting ? animal
On 4/21/2023 11:25 AM, Nick Andrews wrote:
Now I know that for some folks parting off in the lathe is routine, but for some of us it's a real PITA. Or can be. I've tried using a nice HSS blade in a holder with lots of oil and freshly-ground tip and still got it pulling to one side, and now a 1-inch tall steel blade with carbide insert for the first time last night. Yeah, I broke the insert. And yes, it was a cheapo chinese insert. As delivered, the holder body was not well made and the bottom of the slot for the tool was tapered, causing a tilt in the cutoff blade of about 3 degrees or so. Imagine that from an ebay seller! So I put it in the the vise and milled the slot more parallel, which corrected the vertical angle of the cutoff blade, mostly. I tried to minimize stick-out but still got too much chatter. Part isn't that far out from the 4-jaw, but a tailstock center might've helped on chatter.
This is on a piece of 1.5" steel rod I got left from a construction project, no idea what alloy. Maybe I have the wrong speed going and need to crank it up for carbide cutting. Heard people say many home lathes struggle to spin fast enough for carbide but that seems unlikely. Haven't tested higher revs yet, wanted to get your thoughts.
I saw a youtube video this morning where a guy made a little foot from a piece of CRS that he bolted through his tool holder that sits on the top of the cross slide to keep it from bending down which seems interesting, but not sure if I could do that or not on my lathe.
|
Re: Breaking carbide inserts parting off?
??? ??? Yea , looks like it can be cut down some . These folks
sell the drawings separate so a guy/gal can make their own with
what they have . I don't see why it really has to be made from CI?
but maybe someone else here can school me/us on that matter . the
plans are only $ 6.00 for the tool post or the cross slide . I
thought I had read somewhere at one time that if you bought the
plans & then bought the casting later they would credit you on
the plans when purchasing the casting ?
??? ??? IIRC OKC Bill bought a crossslide kit from a guy that
bought it & never made it .
??? ??? animal
On 4/21/2023 1:29 PM, Andrei wrote:
toggle quoted message
Show quoted text
Looks like that rear parting tool is designed for 12 inch and
bigger lathes. You can probably shave down the casting and alter
the dovetails to make it work on your Sheldon.?
Andrei
??? ??? They have a rear mounted parting tool tool post they
also sell .? I should buy the crossslide & just have it
here for when I'm ready to make one . I need to learn
dovetails first .
??? ??? Rear Tool Post
??? ??? animal
On 4/21/2023 12:20 PM, Nick
Andrews wrote:
This is on my 11" Sheldon lathe.? No, haven't tried
snugging the gibs but did lock the saddle.? I guess if I
am taking the time to make something, tweaking the gibs
shouldn't seem like such a chore...
Interesting casting.? Do you then just bolt your tool
post on directly somehow?
On Fri, Apr 21, 2023 at
1:49?PM mike allen < animal@...> wrote:
??? ??? I've seen some of those parting tool supports
that folks make on youtube in the past . Folks seem to
like them ,? but then again its the guy that made it
that says its bitchin . These folks make a longer
crossslide casting that you machine to finish that
allows you to put a tool post behind the work so your
parting tool is mounted upside down , some folks say
this is a huge improvement when parting . This is one
of my projects on my list to make sometime . Are you
locking the saddle & tightening the crossslide
& compound gibs? when parting ?
??? ???
??? ??? animal
On 4/21/2023 11:25 AM, Nick Andrews wrote:
Now I know that for some folks parting off in
the lathe is routine, but for some of us it's a
real PITA.? Or can be.? I've tried using a nice
HSS blade in a holder with lots of oil and
freshly-ground tip and still got it pulling to one
side, and now a 1-inch tall steel blade with
carbide insert for the first time last night.?
Yeah, I broke the insert.? And yes, it was a
cheapo chinese insert.? As delivered, the holder
body was not well made and the bottom of the slot
for the tool was tapered, causing a tilt in the
cutoff blade of about 3 degrees or so.? Imagine
that from an ebay seller!? So I put it in the the
vise and milled the slot more parallel, which
corrected the vertical angle of the cutoff blade,
mostly.? I tried to minimize stick-out but still
got too much chatter.? Part isn't that far out
from the 4-jaw, but a tailstock center might've
helped on chatter.
This is on a piece of 1.5" steel rod I got left
from a construction project, no idea what alloy.?
Maybe I have the wrong speed going and need to
crank it up for carbide cutting.? Heard people say
many home lathes struggle to spin fast enough for
carbide but that seems unlikely.? Haven't tested
higher revs yet, wanted to get your thoughts.
I saw a youtube video this morning? where a guy
made a little foot from a piece of CRS that he
bolted through his tool holder that sits on the
top of the cross slide to keep it from bending
down which seems interesting, but not sure if I
could do that or not on my lathe.??
|
Re: Breaking carbide inserts parting off?
Looks like that rear parting tool is designed for 12 inch and bigger lathes. You can probably shave down the casting and alter the dovetails to make it work on your Sheldon.?
Andrei
toggle quoted message
Show quoted text
??? ??? They have a rear mounted parting tool tool post they also sell .? I should buy the crossslide & just have it here for when I'm ready to make one . I need to learn dovetails first .
??? ??? Rear Tool Post
??? ??? animal
On 4/21/2023 12:20 PM, Nick Andrews wrote:
This is on my 11" Sheldon lathe.? No, haven't tried snugging the gibs but did lock the saddle.? I guess if I am taking the time to make something, tweaking the gibs shouldn't seem like such a chore...
Interesting casting.? Do you then just bolt your tool post on directly somehow?
On Fri, Apr 21, 2023 at 1:49?PM mike allen < animal@...> wrote:
??? ??? I've seen some of those parting tool supports that folks make on youtube in the past . Folks seem to like them ,? but then again its the guy that made it that says its bitchin . These folks make a longer crossslide casting that you machine to finish
that allows you to put a tool post behind the work so your parting tool is mounted upside down , some folks say this is a huge improvement when parting . This is one of my projects on my list to make sometime . Are you locking the saddle & tightening the crossslide
& compound gibs? when parting ?
??? ???
??? ??? animal
On 4/21/2023 11:25 AM, Nick Andrews wrote:
Now I know that for some folks parting off in the lathe is routine, but for some of us it's a real PITA.? Or can be.? I've tried using a nice HSS blade in a holder with lots of oil and freshly-ground tip and still got it pulling to one side, and now a
1-inch tall steel blade with carbide insert for the first time last night.? Yeah, I broke the insert.? And yes, it was a cheapo chinese insert.? As delivered, the holder body was not well made and the bottom of the slot for the tool was tapered, causing a
tilt in the cutoff blade of about 3 degrees or so.? Imagine that from an ebay seller!? So I put it in the the vise and milled the slot more parallel, which corrected the vertical angle of the cutoff blade, mostly.? I tried to minimize stick-out but still got
too much chatter.? Part isn't that far out from the 4-jaw, but a tailstock center might've helped on chatter.
This is on a piece of 1.5" steel rod I got left from a construction project, no idea what alloy.? Maybe I have the wrong speed going and need to crank it up for carbide cutting.? Heard people say many home lathes struggle to spin fast enough for carbide
but that seems unlikely.? Haven't tested higher revs yet, wanted to get your thoughts.
I saw a youtube video this morning? where a guy made a little foot from a piece of CRS that he bolted through his tool holder that sits on the top of the cross slide to keep it from bending down which seems interesting, but not sure if I could do that
or not on my lathe.??
|
Re: Breaking carbide inserts parting off?
??? ??? They have a rear mounted parting tool tool post they also
sell .? I should buy the crossslide & just have it here for
when I'm ready to make one . I need to learn dovetails first .
??? ??? Rear Tool Post
??? ??? animal
On 4/21/2023 12:20 PM, Nick Andrews
wrote:
toggle quoted message
Show quoted text
This is on my 11" Sheldon lathe.? No, haven't tried
snugging the gibs but did lock the saddle.? I guess if I am
taking the time to make something, tweaking the gibs shouldn't
seem like such a chore...
Interesting casting.? Do you then just bolt your tool post
on directly somehow?
On Fri, Apr 21, 2023 at
1:49?PM mike allen < animal@...>
wrote:
??? ??? I've seen some of those parting tool supports
that folks make on youtube in the past . Folks seem to
like them ,? but then again its the guy that made it that
says its bitchin . These folks make a longer crossslide
casting that you machine to finish that allows you to put
a tool post behind the work so your parting tool is
mounted upside down , some folks say this is a huge
improvement when parting . This is one of my projects on
my list to make sometime . Are you locking the saddle
& tightening the crossslide & compound gibs? when
parting ?
??? ???
??? ??? animal
On 4/21/2023 11:25 AM, Nick Andrews wrote:
Now I know that for some folks parting off in the
lathe is routine, but for some of us it's a real
PITA.? Or can be.? I've tried using a nice HSS blade
in a holder with lots of oil and freshly-ground tip
and still got it pulling to one side, and now a 1-inch
tall steel blade with carbide insert for the first
time last night.? Yeah, I broke the insert.? And yes,
it was a cheapo chinese insert.? As delivered, the
holder body was not well made and the bottom of the
slot for the tool was tapered, causing a tilt in the
cutoff blade of about 3 degrees or so.? Imagine that
from an ebay seller!? So I put it in the the vise and
milled the slot more parallel, which corrected the
vertical angle of the cutoff blade, mostly.? I tried
to minimize stick-out but still got too much chatter.?
Part isn't that far out from the 4-jaw, but a
tailstock center might've helped on chatter.
This is on a piece of 1.5" steel rod I got left
from a construction project, no idea what alloy.?
Maybe I have the wrong speed going and need to crank
it up for carbide cutting.? Heard people say many home
lathes struggle to spin fast enough for carbide but
that seems unlikely.? Haven't tested higher revs yet,
wanted to get your thoughts.
I saw a youtube video this morning? where a guy
made a little foot from a piece of CRS that he bolted
through his tool holder that sits on the top of the
cross slide to keep it from bending down which seems
interesting, but not sure if I could do that or not on
my lathe.??
|
Re: Breaking carbide inserts parting off?
This is on my 11" Sheldon lathe.? No, haven't tried snugging the gibs but did lock the saddle.? I guess if I am taking the time to make something, tweaking the gibs shouldn't seem like such a chore...
Interesting casting.? Do you then just bolt your tool post on directly somehow?
On Fri, Apr 21, 2023 at 1:49?PM mike allen < animal@...> wrote:
??? ??? I've seen some of those parting tool supports that folks
make on youtube in the past . Folks seem to like them ,? but then
again its the guy that made it that says its bitchin . These folks
make a longer crossslide casting that you machine to finish that
allows you to put a tool post behind the work so your parting tool
is mounted upside down , some folks say this is a huge improvement
when parting . This is one of my projects on my list to make
sometime . Are you locking the saddle & tightening the
crossslide & compound gibs? when parting ?
??? ???
??? ??? animal
On 4/21/2023 11:25 AM, Nick Andrews
wrote:
Now I know that for some folks parting off in the lathe is
routine, but for some of us it's a real PITA.? Or can be.?
I've tried using a nice HSS blade in a holder with lots of oil
and freshly-ground tip and still got it pulling to one side,
and now a 1-inch tall steel blade with carbide insert for the
first time last night.? Yeah, I broke the insert.? And yes, it
was a cheapo chinese insert.? As delivered, the holder body
was not well made and the bottom of the slot for the tool was
tapered, causing a tilt in the cutoff blade of about 3 degrees
or so.? Imagine that from an ebay seller!? So I put it in the
the vise and milled the slot more parallel, which corrected
the vertical angle of the cutoff blade, mostly.? I tried to
minimize stick-out but still got too much chatter.? Part isn't
that far out from the 4-jaw, but a tailstock center might've
helped on chatter.
This is on a piece of 1.5" steel rod I got left from a
construction project, no idea what alloy.? Maybe I have the
wrong speed going and need to crank it up for carbide
cutting.? Heard people say many home lathes struggle to spin
fast enough for carbide but that seems unlikely.? Haven't
tested higher revs yet, wanted to get your thoughts.
I saw a youtube video this morning? where a guy made a
little foot from a piece of CRS that he bolted through his
tool holder that sits on the top of the cross slide to keep it
from bending down which seems interesting, but not sure if I
could do that or not on my lathe.??
|
Re: Breaking carbide inserts parting off?
For some truly amazing parting tool action check out Robin Renzetti: |
toggle quoted message
Show quoted text
On Apr 21, 2023, at 12:11 PM, Nick Andrews <nickjandrews@...> wrote:
I have the el cheapo Bauer one and yes it works well but the idea on the lathe is for a nice clean square cut and to be able to easily make thick washers, etc.
On Fri, Apr 21, 2023 at 1:28?PM Andrei <
calciu1@...> wrote:
I got one of these, Nick:?
Works great! You can use it at the bench vise and just about anywhere you have enough room to bring it in.?
Now I know that for some folks parting off in the lathe is routine, but for some of us it's a real PITA.? Or can be.? I've tried using a nice HSS blade in a holder with lots of oil and freshly-ground tip and still got it pulling to one side, and now a
1-inch tall steel blade with carbide insert for the first time last night.? Yeah, I broke the insert.? And yes, it was a cheapo chinese insert.? As delivered, the holder body was not well made and the bottom of the slot for the tool was tapered, causing a
tilt in the cutoff blade of about 3 degrees or so.? Imagine that from an ebay seller!? So I put it in the the vise and milled the slot more parallel, which corrected the vertical angle of the cutoff blade, mostly.? I tried to minimize stick-out but still got
too much chatter.? Part isn't that far out from the 4-jaw, but a tailstock center might've helped on chatter.
This is on a piece of 1.5" steel rod I got left from a construction project, no idea what alloy.? Maybe I have the wrong speed going and need to crank it up for carbide cutting.? Heard people say many home lathes struggle to spin fast enough for carbide
but that seems unlikely.? Haven't tested higher revs yet, wanted to get your thoughts.
I saw a youtube video this morning? where a guy made a little foot from a piece of CRS that he bolted through his tool holder that sits on the top of the cross slide to keep it from bending down which seems interesting, but not sure if I could do that
or not on my lathe.??
Re: Breaking carbide inserts parting off?
I have the el cheapo Bauer one and yes it works well but the idea on the lathe is for a nice clean square cut and to be able to easily make thick washers, etc.
On Fri, Apr 21, 2023 at 1:28?PM Andrei < calciu1@...> wrote:
I got one of these, Nick:?
Works great! You can use it at the bench vise and just about anywhere you have enough room to bring it in.?
Now I know that for some folks parting off in the lathe is routine, but for some of us it's a real PITA.? Or can be.? I've tried using a nice HSS blade in a holder with lots of oil and freshly-ground tip and still got it pulling to one side, and now a
1-inch tall steel blade with carbide insert for the first time last night.? Yeah, I broke the insert.? And yes, it was a cheapo chinese insert.? As delivered, the holder body was not well made and the bottom of the slot for the tool was tapered, causing a
tilt in the cutoff blade of about 3 degrees or so.? Imagine that from an ebay seller!? So I put it in the the vise and milled the slot more parallel, which corrected the vertical angle of the cutoff blade, mostly.? I tried to minimize stick-out but still got
too much chatter.? Part isn't that far out from the 4-jaw, but a tailstock center might've helped on chatter.
This is on a piece of 1.5" steel rod I got left from a construction project, no idea what alloy.? Maybe I have the wrong speed going and need to crank it up for carbide cutting.? Heard people say many home lathes struggle to spin fast enough for carbide
but that seems unlikely.? Haven't tested higher revs yet, wanted to get your thoughts.
I saw a youtube video this morning? where a guy made a little foot from a piece of CRS that he bolted through his tool holder that sits on the top of the cross slide to keep it from bending down which seems interesting, but not sure if I could do that
or not on my lathe.??
|
Re: Breaking carbide inserts parting off?
Make sure your tool is exactly perpendicular to the part/perfectly parallel to the cross-slide travel.? I have been at an angle but "the cross slide was pushing the tool perpendicular to the part" and kept binding, pushing off to side and breaking.
Ensure you are at spinning center of the part, not above and not below.
On Fri, Apr 21, 2023 at 2:49?PM ken campbell < deltainc@...> wrote: my first lathe was a 9 inch logan ...? needed a crutch approach to do cut-offs.? now I have a 13 inch Southbend ... seldom have trouble with cutoffs.
Stiffness is the key ... also so far my best cutoff tool is a blade with carbide insert.? mine is an expensive Iscar brand .? if you go chinese, at least go Shars or someone you can complain to .. heh.
with my 9 inch Logan, I got by ok with a slower but necessary method ::? ? run cutoff blade in about 2 widths deep, the start another cutoff cut inboard to same depth.? you are making a cutoff groove wider than your tool for chip clearance ... because chips are the biggest reason for failure in cutting off.? keep " double pecking " until the parting is done.??
hope this helps ...
oh, meanwhile keep an eye out for a bandsaw that takes a metal cutting blade ...  ?...?
|
Re: Breaking carbide inserts parting off?
my first lathe was a 9 inch logan ...? needed a crutch approach to do cut-offs.? now I have a 13 inch Southbend ... seldom have trouble with cutoffs.
Stiffness is the key ... also so far my best cutoff tool is a blade with carbide insert.? mine is an expensive Iscar brand .? if you go chinese, at least go Shars or someone you can complain to .. heh.
with my 9 inch Logan, I got by ok with a slower but necessary method ::? ? run cutoff blade in about 2 widths deep, the start another cutoff cut inboard to same depth.? you are making a cutoff groove wider than your tool for chip clearance ... because chips are the biggest reason for failure in cutting off.? keep " double pecking " until the parting is done.??
hope this helps ...
oh, meanwhile keep an eye out for a bandsaw that takes a metal cutting blade ...  ?...?
|
Re: Breaking carbide inserts parting off?
??? ??? I've seen some of those parting tool supports that folks
make on youtube in the past . Folks seem to like them ,? but then
again its the guy that made it that says its bitchin . These folks
make a longer crossslide casting that you machine to finish that
allows you to put a tool post behind the work so your parting tool
is mounted upside down , some folks say this is a huge improvement
when parting . This is one of my projects on my list to make
sometime . Are you locking the saddle & tightening the
crossslide & compound gibs? when parting ?
??? ???
??? ??? animal
On 4/21/2023 11:25 AM, Nick Andrews
wrote:
toggle quoted message
Show quoted text
Now I know that for some folks parting off in the lathe is
routine, but for some of us it's a real PITA.? Or can be.?
I've tried using a nice HSS blade in a holder with lots of oil
and freshly-ground tip and still got it pulling to one side,
and now a 1-inch tall steel blade with carbide insert for the
first time last night.? Yeah, I broke the insert.? And yes, it
was a cheapo chinese insert.? As delivered, the holder body
was not well made and the bottom of the slot for the tool was
tapered, causing a tilt in the cutoff blade of about 3 degrees
or so.? Imagine that from an ebay seller!? So I put it in the
the vise and milled the slot more parallel, which corrected
the vertical angle of the cutoff blade, mostly.? I tried to
minimize stick-out but still got too much chatter.? Part isn't
that far out from the 4-jaw, but a tailstock center might've
helped on chatter.
This is on a piece of 1.5" steel rod I got left from a
construction project, no idea what alloy.? Maybe I have the
wrong speed going and need to crank it up for carbide
cutting.? Heard people say many home lathes struggle to spin
fast enough for carbide but that seems unlikely.? Haven't
tested higher revs yet, wanted to get your thoughts.
I saw a youtube video this morning? where a guy made a
little foot from a piece of CRS that he bolted through his
tool holder that sits on the top of the cross slide to keep it
from bending down which seems interesting, but not sure if I
could do that or not on my lathe.??
|
Re: Breaking carbide inserts parting off?
I got one of these, Nick:?
Works great! You can use it at the bench vise and just about anywhere you have enough room to bring it in.?
toggle quoted message
Show quoted text
Now I know that for some folks parting off in the lathe is routine, but for some of us it's a real PITA.? Or can be.? I've tried using a nice HSS blade in a holder with lots of oil and freshly-ground tip and still got it pulling to one side, and now a
1-inch tall steel blade with carbide insert for the first time last night.? Yeah, I broke the insert.? And yes, it was a cheapo chinese insert.? As delivered, the holder body was not well made and the bottom of the slot for the tool was tapered, causing a
tilt in the cutoff blade of about 3 degrees or so.? Imagine that from an ebay seller!? So I put it in the the vise and milled the slot more parallel, which corrected the vertical angle of the cutoff blade, mostly.? I tried to minimize stick-out but still got
too much chatter.? Part isn't that far out from the 4-jaw, but a tailstock center might've helped on chatter.
This is on a piece of 1.5" steel rod I got left from a construction project, no idea what alloy.? Maybe I have the wrong speed going and need to crank it up for carbide cutting.? Heard people say many home lathes struggle to spin fast enough for carbide
but that seems unlikely.? Haven't tested higher revs yet, wanted to get your thoughts.
I saw a youtube video this morning? where a guy made a little foot from a piece of CRS that he bolted through his tool holder that sits on the top of the cross slide to keep it from bending down which seems interesting, but not sure if I could do that
or not on my lathe.??
|
Breaking carbide inserts parting off?
Now I know that for some folks parting off in the lathe is routine, but for some of us it's a real PITA.? Or can be.? I've tried using a nice HSS blade in a holder with lots of oil and freshly-ground tip and still got it pulling to one side, and now a 1-inch tall steel blade with carbide insert for the first time last night.? Yeah, I broke the insert.? And yes, it was a cheapo chinese insert.?
As delivered, the holder body was not well made and the bottom of the slot for the tool was tapered, causing a tilt in the cutoff blade of about 3 degrees or so.? Imagine that from an ebay seller!? So I put it in the the vise and milled the slot more parallel, which corrected the vertical angle of the cutoff blade, mostly.? I tried to minimize stick-out but still got too much chatter.? Part isn't that far out from the 4-jaw, but a tailstock center might've helped on chatter.
This is on a piece of 1.5" steel rod I got left from a construction project, no idea what alloy.? Maybe I have the wrong speed going and need to crank it up for carbide cutting.? Heard people say many home lathes struggle to spin fast enough for carbide but that seems unlikely.? Haven't tested higher revs yet, wanted to get your thoughts.
I saw a youtube video this morning? where a guy made a little foot from a piece of CRS that he bolted through his tool holder that sits on the top of the cross slide to keep it from bending down which seems interesting, but not sure if I could do that or not on my lathe.??
|
Re: Home Shop Machinist Magazines
Hi,
I'm the buyer and yeah, that link is part of the reason I spent a day driving to/from western NY.
I'll have some duplicates -- I've been a subscriber for the past ~10 years -- and will batch sell those on eBay after I sort things all out.
--jet
toggle quoted message
Show quoted text
On 4/16/2023 3:42 PM, John Burt wrote: Jim,
Thanks for the update. I'm glad they found a good home.
I hauled a big collection of my Dad's HSM 500 miles to my home, and you're right, that's a lot of weight and shipping wouldn't have made any sense.
3 years later and I'm still making my way through them.
I hope the buyer knows about the online index available here:
<>
That has been helpful to me, especially in the spreadsheet form, for finding articles/information of interest.
--
Jet Townsend
<>
HF: KC3HSO
PGP fingerprint: CBFF BB96 45F0 EC10 9649 030E 12AA 9DBF DC01 847E
|
Re: Home Shop Machinist Magazines
Good for you, but sorry for me! ;) Hopefully the new owner will get lots of use out of it!
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
Aphorisms to live by: Good judgement comes from experience. Experience comes from bad judgement.? SEMPER GUMBY!
Expect in one hand, expectorate in the other. See which one gets full first.
On Sunday, April 16, 2023 at 02:20:03 PM CDT, Jim Stack <jimstack25@...> wrote:
I know I'm a little late in posting this (I'm out of practice), but just a quick msg. to let everyone know my HSM magazine collection sold. Thanks everyone for the experience. ?-js
While maybe cheaper, a digital version just isn't the same, even if I printed it out in color at work.
On Mon, Apr 10, 2023 at 2:03?PM mike allen < animal@...> wrote:
??? ??? I just went to the HSM site case I was wonderin if the y
had the back issues on disc , but by the year not monthly disc . I
didn't see where they do that though other mag's offer that
feature .
??? ??? What I don't understand is why do some of the digital
month issues cost $ 8.50 & then the one next to it cost $ 5.00
. I was buying HSM & their other one for a while & out of
the 30-40 of them I have here from the last 10 years I think I
only found one article that was worth the price of the mag to me
& unfortunately I lost that issue & I don't remember which
issue it was? . Seems
to me that a 60-70 page magazine should have more than 5 articles
per month . I now get the magazine from England sent to my
computer every month . I also save $$$ that way cause I'm not
buying stuff from the add's , though I have bought from I think
Aerotrade (sp) before & the shipping to Ca US? was more
reasonable then alot of US shippers .
??? ??? end of rant
??? ??? animal
On 4/10/2023 8:28 AM, Bill in OKC too
via wrote:
I've been buying them as I
find one I need (for certain values of "need" anyway) since
ebay was a pup, and ordering from Village Press when I can't
find them any other way. Getting a bunch of them in one
swell foop would be really good. IIRC, oldest issue I have
is from early 90's, as that's about when I first found out
about them. Moved too often before then, and spent five
years overseas, too.?
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
Aphorisms
to live by:
Good judgement comes from experience.
Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise,
Adapt, and Overcome.
Physics
doesn't care about your schedule.
The
only reason I know anything is because I've done
it wrong enough times to START to know better.
Expect in one
hand, expectorate in the other. See which one
gets full first.
On Monday, April 10, 2023 at 10:18:39 AM CDT, John
Byghtn3 via <byghtn3@...>
wrote:
True,
but it is possible, as i bought 18 years of back
issues (6-12 issues at a time sometimes 99C per and
sometimes up to $6 per issue), from an eBay seller and
have a few dozen shipping boxes to show for it. HSM,
MW, DM, and Live Steam
.
This
offer at about $1.25 is an excellent bargain seeing as
99c was 7 years ago. Don't kick yourself for not
acting. The eBay guy is still there if you want to
wait at 99c-up.
.
This
effort would possibly be 4-5 boxes, 200 issues at 50
per box? 40 per box? altho. 40 years would be 480
issues of HSM 240 + MW240 plus a few specials, so
there are still some missing issues....
.
Your
call
.
Good
Luck
If I understood correctly, he has 40
years worth of magazines there. It's going to be
quite the effort to pack and ship. Quite a bit of
postage, too. Worth it to me, but I'll understand
if it's not worth it to him. :)
Bill in OKC
William
R. Meyers, MSgt, USAF(Ret.)?
Aphorisms to live by:
Good judgement comes from
experience. Experience comes from
bad judgement.?
SEMPER GUMBY!
Improvise, Adapt,
and Overcome.
Physics doesn't
care about your schedule.
The only reason I
know anything is because I've done it
wrong enough times to START to know
better.
Expect
in one hand, expectorate in the
other. See which one gets full
first.
On Sunday, April 9, 2023 at 10:56:51 PM CDT,
John Byghtn3 via <byghtn3@...>
wrote:
USPS
Media Mail is very economical...
but,
You
still have to pack them and carry them to
the post office.
Post
office may want to verify the contents as
well.
.
Good
Luck
On
4/9/2023 5:38 PM, Bill in OKC too via
wrote:
If you were willing to ship
them, I'd buy them. Unfortunately,
Oklahoma City doesn't seem to be local
to Niagara Falls.?
William R. Meyers, MSgt,
USAF(Ret.)
Aphorisms
to live by:
Good judgement comes from
experience. Experience comes
from bad judgement.?
SEMPER
GUMBY!
Improvise,
Adapt, and Overcome.
Physics
doesn't care about your
schedule.
The only
reason I know anything is
because I've done it wrong
enough times to START to know
better.
Expect
in one hand, expectorate
in the other. See which
one gets full first.
On Sunday, April 9, 2023 at 04:32:59
PM CDT, mike allen <animal@...>
wrote:
??? ??? If you can't sell them
you may see if theres a MakerSpace
in your area that would want them
.
??? ??? animal
On
4/9/2023 2:17 PM, Jim Stack wrote:
Hey Guys:
I'm starting to feel my age lately
and not been very active here for
quite a while.? I haven't gotten any
response from C.L. ?so I thought I'd
try here next.? I have a very large
collection of Home Shop Machinist
magazines in excellent condition
going back to 1982 thru the end of
2022.? My major interest now is
getting rid of the clutter that has
enveloped me for some time. I'm
offering the lot (more than 200
issues) to anyone that wants them
for any offer of ?$240 or more.
Further details can be found on the
Buffalo, NY Craigslist site, under
general.? The downside is you must
buy them all as I can't spend time
locating individual articles. I need
them all gone, and soon.? Shipping
is not available, so it has to be a
local pickup.? I live in western NYS
near Niagara Falls. Contact me any
way you can (no texting though) if
you are interested. ? Thanks. -js
|
Re: Home Shop Machinist Magazines
??? ??? I ave been looking for a semi recent back issue , I
bought it when it first came out but can not find it in any of my
magazine stacks . A guy wrote a article about a speeds & feeds
setup he built using a Arduino . I wanted to find it cause I was
interested in the code . It was from the last 2-3 years I couldn't
find it in any of the indexes for their 3 magazines , HSM MW &
Digital Workshop .
??? ??? If you remember & see it when your going through the
index or magazines please let? me know the issue date .? I will
buy the back issueif I can find which one it is? since I cannot
find my copy .
??? ??? thanks
??? ??? animal
On 4/16/2023 12:42 PM, John Burt wrote:
toggle quoted message
Show quoted text
Jim,
Thanks for the update. I'm glad they found a good home.
I hauled a big collection of my Dad's HSM 500 miles to my home,
and you're right, that's a lot of weight and shipping wouldn't
have made any sense.
3 years later and I'm still making my way through them.
I hope the buyer knows about the online index available here:
That has been helpful to me, especially in the spreadsheet form,
for finding articles/information of interest.
Now all I need is more time for the interesting projects and ideas
in those pages.
John
|
Re: Home Shop Machinist Magazines
Jim,
Thanks for the update. I'm glad they found a good home.
I hauled a big collection of my Dad's HSM 500 miles to my home, and you're right, that's a lot of weight and shipping wouldn't have made any sense.
3 years later and I'm still making my way through them.
I hope the buyer knows about the online index available here:
That has been helpful to me, especially in the spreadsheet form, for finding articles/information of interest.
Now all I need is more time for the interesting projects and ideas in those pages.
John
|
Re: Home Shop Machinist Magazines
I know I'm a little late in posting this (I'm out of practice), but just a quick msg. to let everyone know my HSM magazine collection sold. Thanks everyone for the experience. ?-js
While maybe cheaper, a digital version just isn't the same, even if I printed it out in color at work.
On Mon, Apr 10, 2023 at 2:03?PM mike allen < animal@...> wrote:
??? ??? I just went to the HSM site case I was wonderin if the y
had the back issues on disc , but by the year not monthly disc . I
didn't see where they do that though other mag's offer that
feature .
??? ??? What I don't understand is why do some of the digital
month issues cost $ 8.50 & then the one next to it cost $ 5.00
. I was buying HSM & their other one for a while & out of
the 30-40 of them I have here from the last 10 years I think I
only found one article that was worth the price of the mag to me
& unfortunately I lost that issue & I don't remember which
issue it was? . Seems
to me that a 60-70 page magazine should have more than 5 articles
per month . I now get the magazine from England sent to my
computer every month . I also save $$$ that way cause I'm not
buying stuff from the add's , though I have bought from I think
Aerotrade (sp) before & the shipping to Ca US? was more
reasonable then alot of US shippers .
??? ??? end of rant
??? ??? animal
On 4/10/2023 8:28 AM, Bill in OKC too
via wrote:
I've been buying them as I
find one I need (for certain values of "need" anyway) since
ebay was a pup, and ordering from Village Press when I can't
find them any other way. Getting a bunch of them in one
swell foop would be really good. IIRC, oldest issue I have
is from early 90's, as that's about when I first found out
about them. Moved too often before then, and spent five
years overseas, too.?
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
Aphorisms
to live by:
Good judgement comes from experience.
Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise,
Adapt, and Overcome.
Physics
doesn't care about your schedule.
The
only reason I know anything is because I've done
it wrong enough times to START to know better.
Expect in one
hand, expectorate in the other. See which one
gets full first.
On Monday, April 10, 2023 at 10:18:39 AM CDT, John
Byghtn3 via <byghtn3@...>
wrote:
True,
but it is possible, as i bought 18 years of back
issues (6-12 issues at a time sometimes 99C per and
sometimes up to $6 per issue), from an eBay seller and
have a few dozen shipping boxes to show for it. HSM,
MW, DM, and Live Steam
.
This
offer at about $1.25 is an excellent bargain seeing as
99c was 7 years ago. Don't kick yourself for not
acting. The eBay guy is still there if you want to
wait at 99c-up.
.
This
effort would possibly be 4-5 boxes, 200 issues at 50
per box? 40 per box? altho. 40 years would be 480
issues of HSM 240 + MW240 plus a few specials, so
there are still some missing issues....
.
Your
call
.
Good
Luck
If I understood correctly, he has 40
years worth of magazines there. It's going to be
quite the effort to pack and ship. Quite a bit of
postage, too. Worth it to me, but I'll understand
if it's not worth it to him. :)
Bill in OKC
William
R. Meyers, MSgt, USAF(Ret.)?
Aphorisms to live by:
Good judgement comes from
experience. Experience comes from
bad judgement.?
SEMPER GUMBY!
Improvise, Adapt,
and Overcome.
Physics doesn't
care about your schedule.
The only reason I
know anything is because I've done it
wrong enough times to START to know
better.
Expect
in one hand, expectorate in the
other. See which one gets full
first.
On Sunday, April 9, 2023 at 10:56:51 PM CDT,
John Byghtn3 via <byghtn3@...>
wrote:
USPS
Media Mail is very economical...
but,
You
still have to pack them and carry them to
the post office.
Post
office may want to verify the contents as
well.
.
Good
Luck
On
4/9/2023 5:38 PM, Bill in OKC too via
wrote:
If you were willing to ship
them, I'd buy them. Unfortunately,
Oklahoma City doesn't seem to be local
to Niagara Falls.?
William R. Meyers, MSgt,
USAF(Ret.)
Aphorisms
to live by:
Good judgement comes from
experience. Experience comes
from bad judgement.?
SEMPER
GUMBY!
Improvise,
Adapt, and Overcome.
Physics
doesn't care about your
schedule.
The only
reason I know anything is
because I've done it wrong
enough times to START to know
better.
Expect
in one hand, expectorate
in the other. See which
one gets full first.
On Sunday, April 9, 2023 at 04:32:59
PM CDT, mike allen <animal@...>
wrote:
??? ??? If you can't sell them
you may see if theres a MakerSpace
in your area that would want them
.
??? ??? animal
On
4/9/2023 2:17 PM, Jim Stack wrote:
Hey Guys:
I'm starting to feel my age lately
and not been very active here for
quite a while.? I haven't gotten any
response from C.L. ?so I thought I'd
try here next.? I have a very large
collection of Home Shop Machinist
magazines in excellent condition
going back to 1982 thru the end of
2022.? My major interest now is
getting rid of the clutter that has
enveloped me for some time. I'm
offering the lot (more than 200
issues) to anyone that wants them
for any offer of ?$240 or more.
Further details can be found on the
Buffalo, NY Craigslist site, under
general.? The downside is you must
buy them all as I can't spend time
locating individual articles. I need
them all gone, and soon.? Shipping
is not available, so it has to be a
local pickup.? I live in western NYS
near Niagara Falls. Contact me any
way you can (no texting though) if
you are interested. ? Thanks. -js
|
Re: Slot-milling worked out on my 10k
??? ??? Damn my bad , that was for the V-belt model . sorry bout
that .
??? ??? animal
On 4/11/2023 2:39 PM, Rogan Creswick
wrote:
toggle quoted message
Show quoted text
Huh, my lathe only has three steps in the
flat-belt step pulley.
My tach is giving numbers that "feel" right,
given how fast things seem to be moving:
509, 300, 175 direct drive
95, 84, 33 back gears
On Tue, Apr 11, 2023, 1:04 PM
mike allen < animal@...>
wrote:
??? ??? Thanks , heres the google #'s in case you want to
check yer tach
??? ??? 48,
80, 96, 137, 165 and 276 r.p.m. in backgear and 244,
415, 502, 706, 844 and 1435 r.p.m. in direct drive.
With V-belt drive the speeds became approximately: 52,
72, 95, 112, 130, 150, 195 and 265 r.p.m. in backgear
and 285, 370, 495, 570, 670, 1010 and 1365 in open gear.
??? ??? animal
On 4/11/2023 12:26 PM, Rogan Creswick wrote:
I don't know the spindle speed -- I have a
tach, but haven't measured & written down the speeds
at each setting -- as fas as it would go with my 1725rpm
motor, but there's a pulley exchange there that's likely
specific to my lathe.
For the crossfeed: I'm also not sure how the
gearbox translates to crossfeed speed.? I was using
the 224tpi / 0.0015" per rev gearbox setting.? Does
anyone know how that translates to a radial velocity?
On Tue, Apr 11, 2023
at 10:57?AM mike allen < animal@...>
wrote:
??? ??? What speed were you using ?
??? ??? animal
On 4/11/2023 9:00 AM, Rogan Creswick wrote:
Yeah, I was pretty worried about
that stick-out, but I only had three 3/16"
endmills; two of these, and one shorter 2-flute.
I wanted the extra flutes, given the speed
limits on my lathe, but these 4-flute
endmills?are fluted for a? *long* ways, and I
needed enough clean shank to indicate on.
I did break one of them in a test cut,
feeding by hand, though, so the power
cross-feed really made this possible.? I have
a really hard time feeding that slowly and
steadily by hand.
Thanks for the great video and
picture!? I'm amazed you were able to do
that slot with that end mill hanging out
that far. Nice. :-)
The other Jim B.
|
Re: Slot-milling worked out on my 10k
While rebuilding the head of my Bridgeport Series I variable speed, I wondered about the accuracy of the dial, so I bought a Jeff-special chinese digital optical tach from Amazon.? You apply a piece of reflective sticker to the spindle (or whatever you are checking), run the item and point the tach at the sticker.? With testing on multiple other things, it appears to be pretty accurate for the $15 or whatever it cost and seems to read pretty consistently.
On Tue, Apr 11, 2023 at 4:39?PM Rogan Creswick < creswick@...> wrote: Huh, my lathe only has three steps in the flat-belt step pulley.
My tach is giving numbers that "feel" right, given how fast things seem to be moving:
509, 300, 175 direct drive
95, 84, 33 back gears
On Tue, Apr 11, 2023, 1:04 PM mike allen < animal@...> wrote:
??? ??? Thanks , heres the google #'s in case you want to check
yer tach
??? ??? 48, 80, 96, 137, 165 and 276 r.p.m. in backgear and
244, 415, 502, 706, 844 and 1435 r.p.m. in direct drive. With V-belt
drive the speeds became approximately: 52, 72, 95, 112, 130,
150, 195 and 265 r.p.m. in backgear and 285, 370, 495, 570, 670,
1010 and 1365 in open gear.
??? ???
animal
On 4/11/2023 12:26 PM, Rogan Creswick
wrote:
I don't know the spindle speed -- I have a tach,
but haven't measured & written down the speeds at each
setting -- as fas as it would go with my 1725rpm motor, but
there's a pulley exchange there that's likely specific to my
lathe.
For the crossfeed: I'm also not sure how the gearbox
translates to crossfeed speed.? I was using the 224tpi /
0.0015" per rev gearbox setting.? Does anyone know how that
translates to a radial velocity?
On Tue, Apr 11, 2023 at
10:57?AM mike allen < animal@...>
wrote:
??? ??? What speed were you using ?
??? ??? animal
On 4/11/2023 9:00 AM, Rogan Creswick wrote:
Yeah, I was pretty worried about that
stick-out, but I only had three 3/16" endmills; two of
these, and one shorter 2-flute. I wanted the extra
flutes, given the speed limits on my lathe, but these
4-flute endmills?are fluted for a? *long* ways, and I
needed enough clean shank to indicate on.
I did break one of them in a test cut, feeding by
hand, though, so the power cross-feed really made this
possible.? I have a really hard time feeding that
slowly and steadily by hand.
Thanks for the great video and
picture!? I'm amazed you were able to do that slot
with that end mill hanging out that far. Nice. :-)
The other Jim B.
|
Re: Slot-milling worked out on my 10k
Huh, my lathe only has three steps in the flat-belt step pulley.
My tach is giving numbers that "feel" right, given how fast things seem to be moving:
509, 300, 175 direct drive
95, 84, 33 back gears
On Tue, Apr 11, 2023, 1:04 PM mike allen < animal@...> wrote:
??? ??? Thanks , heres the google #'s in case you want to check
yer tach
??? ??? 48, 80, 96, 137, 165 and 276 r.p.m. in backgear and
244, 415, 502, 706, 844 and 1435 r.p.m. in direct drive. With V-belt
drive the speeds became approximately: 52, 72, 95, 112, 130,
150, 195 and 265 r.p.m. in backgear and 285, 370, 495, 570, 670,
1010 and 1365 in open gear.
??? ???
animal
On 4/11/2023 12:26 PM, Rogan Creswick
wrote:
I don't know the spindle speed -- I have a tach,
but haven't measured & written down the speeds at each
setting -- as fas as it would go with my 1725rpm motor, but
there's a pulley exchange there that's likely specific to my
lathe.
For the crossfeed: I'm also not sure how the gearbox
translates to crossfeed speed.? I was using the 224tpi /
0.0015" per rev gearbox setting.? Does anyone know how that
translates to a radial velocity?
On Tue, Apr 11, 2023 at
10:57?AM mike allen < animal@...>
wrote:
??? ??? What speed were you using ?
??? ??? animal
On 4/11/2023 9:00 AM, Rogan Creswick wrote:
Yeah, I was pretty worried about that
stick-out, but I only had three 3/16" endmills; two of
these, and one shorter 2-flute. I wanted the extra
flutes, given the speed limits on my lathe, but these
4-flute endmills?are fluted for a? *long* ways, and I
needed enough clean shank to indicate on.
I did break one of them in a test cut, feeding by
hand, though, so the power cross-feed really made this
possible.? I have a really hard time feeding that
slowly and steadily by hand.
Thanks for the great video and
picture!? I'm amazed you were able to do that slot
with that end mill hanging out that far. Nice. :-)
The other Jim B.
|
Nick Andrews
Bill in OKC too
Jim Stack