I do it upside down, in front of the work, with the motor running backwards (clockwise as you face the spindle).? Works great.
On Saturday, April 26, 2025 at 11:26:55 AM PDT, David Robertson <david@...> wrote:
Evan¡ what am I missing. If the tool is upside down behind the work, normal rotation would be called for¡ right?
David Robertson
On Apr 25, 2025, at 9:09?PM, Evan via groups.io <AEDLewis@...> wrote:
? I made a parting tool holder that holds the tool upside down on the back of the cross slide and run the motor backwards (with a clamp for the screw-on chuck). ?This works great. We had long discussions on the Boxford Users Group (io). ?I think the main difference is that the swarf drops out with gravity and does not get jammed in beside the cutting tool. There are many theories. ?Often I just use an ordinary QCTP and only bother to set up the reverse rotation if I am having trouble.
--
Evan
Lathe: 1955 Boxford Model A with screw cutting gearbox, power feed with several accessories, hand tools and a pillar drill press.
Try my Free Online Gear train Software:
You enter a thread pitch or TPI and it shows you a range of gear trains and gearbox setting to use and even a scale drawing of the gear train.
It also includes calculations for taper turning by the tailstock offset method, and cutting speeds.
It includes the specifications for many thread types eg metric, UNC, BSW, and BA.
Displays drill sizes for tapping threads at any percent thread depth (with full explanations).
My YouTube Channel and Playlist about using an engineers lathe: ?
Project to build a Greek Hero steam engine and measure its power output:?
|
Evan¡ what am I missing. If the tool is upside down behind the work, normal rotation would be called for¡ right?
David Robertson
toggle quoted message
Show quoted text
On Apr 25, 2025, at 9:09?PM, Evan via groups.io <AEDLewis@...> wrote:
? I made a parting tool holder that holds the tool upside down on the back of the cross slide and run the motor backwards (with a clamp for the screw-on chuck). ?This works great. We had long discussions on the Boxford Users Group (io). ?I think the main difference is that the swarf drops out with gravity and does not get jammed in beside the cutting tool. There are many theories. ?Often I just use an ordinary QCTP and only bother to set up the reverse rotation if I am having trouble.
--
Evan
Lathe: 1955 Boxford Model A with screw cutting gearbox, power feed with several accessories, hand tools and a pillar drill press.
Try my Free Online Gear train Software:
You enter a thread pitch or TPI and it shows you a range of gear trains and gearbox setting to use and even a scale drawing of the gear train.
It also includes calculations for taper turning by the tailstock offset method, and cutting speeds.
It includes the specifications for many thread types eg metric, UNC, BSW, and BA.
Displays drill sizes for tapping threads at any percent thread depth (with full explanations).
My YouTube Channel and Playlist about using an engineers lathe: ?
Project to build a Greek Hero steam engine and measure its power output:?
|
Re: A visit to a scale model steam locomotive factory in Colorado
I am in a tiny town called Strasburg, 36 miles (60km) east of Denver.? I was chatting to the camping ground staff about Goldmine Experience in Thames, and they told me that there is an engineering firm making scale model steam locomotives (about 19¡± gauge) just around the corner. Within walking distance.? It was 4 pm on Friday, but I ran over.? The 85 year-old owner (Marlin Uhrich) gave me a wonderful 2.5 hour tour of his private factory. ?He has all kinds of old manual machine tools (no CNC). He also has a foundry with a cupola furnace capable of melting 3 tons of cast iron. ?
?
I took loads of photos and talked about Goldmine Experience, when it suddenly dawned on me that he may be able to help with replacing the displacement oilers that were stolen from our steam engines. He said he has about 18 of them. I spotted two on the shelf and offered $50 each. He said he would take $75 each. This is a bit cheaper than the quote we had from a dealer in UK at 1250 pounds each plus shipping!? So I bought them both and will ship them from Tennessee to Thames later in May.
?
?
These are the oilers I bought.?
We call them displacement oilers, but he said they are hydrostatic Michigan oilers. ?
Our steam engines are British and this would be US terminology.
The one on the left needs minor repairs.
The sight glass is broken and it needs a new tap handle.
?
?
?
Marlin and I talking with his apprentice.
?
?
A steam locomotive they just completed and steamed up for the first time this week.
?
?
?
?
Another locomotive he has been working on for years.
?
?
?
?
?
?
Milling machine.
Ex US Air Force.
?
?
Apprentice pointing out a shaper. They are not used very much these days.
We had one at our High School in Te Puke, NZ.
?
?
A slotting machine like Nelson¡¯s.
?
?
?
?
The foundry shop.
These days he has more artists coming to cast art work, than actual engineers.
?
?
?
A large planar. Similar to a shaper but the work-piece moves backwards and forwards on the bed.
?
?
A small steam engine used to inject water into a boiler.
It has a displacement oiler.
?
?
?
The cupola furnace for producing molten cast iron for sand casting.
?
?
The foundry with a stack of sand casting boxes called copes and drags.
?
?
?
Here they are making a device very similar to a collet that is used to clamp the pipe of an oil drilling rig with an unusual diameter of 6-7/8 inches.? It was turned on a solid base, then 6 sections brazed before cutting slots using the dividing head seen in the next photo. When finished the brazing will be removed to release the 6 segments. Then hardened grippers are fitted inside to grip the pipe. (Rockwell hardness 65).
?
?
The milling machine set up to cut the slots. Radial head on the right.
?
?
The small hardened grippers.
?
?
Marlin¡¯s boiler.
?
?
?
A spinning lathe which he used for making oil lamps for railway carriages (see below).
?
?
Another workshop.
?
?
?
Overhead belt system driven by steam or electricity. It runs very quietly (Like Nelson¡¯s).
?
?
Crane.
?
?
?
One of the lamps he made from spun brass.
?
?
--
Evan
Lathe: 1955 Boxford Model A with screw cutting gearbox, power feed with several accessories, hand tools and a pillar drill press.
Try my Free Online Gear train Software:
You enter a thread pitch or TPI and it shows you a range of gear trains and gearbox setting to use and even a scale drawing of the gear train.
It also includes calculations for taper turning by the tailstock offset method, and cutting speeds.
It includes the specifications for many thread types eg metric, UNC, BSW, and BA.
Displays drill sizes for tapping threads at any percent thread depth (with full explanations).
My YouTube Channel and Playlist about using an engineers lathe: ?
Project to build a Greek Hero steam engine and measure its power output:?
|
Re: A visit to a scale model steam locomotive factory in Colorado
They have been known to work on the real thing too! Strasbourg Locomotive Works! BTDT?? Bill
Probably old amusement parks.
--
Lone Tree, Colorado? ?USA
|
Parting is such sweet sorrow!
On Friday, 25 April 2025, 03:56:51 GMT+1, Mike W via groups.io <mike.wilkens@...> wrote:
Yesterday I had to part off some aluminum (6061), 24mm diameter, and remembered that I had had endless trouble previously with this operation - regardless of material.
?
So this time I took off the quick change toolpost and re-installed the original four-way.? The parting off process went smoothly with none of the problems I'd encountered before.? It did get jammed once - I was running the motor too slowly.? (I don't have a low gear anymore.)? Didn't matter if I used oil or not, or went fast or slow.? It was as easy as any other operation.
?
Something about how the QC extends over the compound - one of the weak parts of these lathes - lessens the rigidity necessary to do this operation well.
?
-Mike
?
|
Re: A visit to a scale model steam locomotive factory in Colorado
Probably old amusement parks.
--
Lone Tree, Colorado? ?USA
|
Re: A visit to a scale model steam locomotive factory in Colorado
Wow. What an amazing place.
But I gotta ask: who uses 19" gauge locomotives?
|
Re: A visit to a scale model steam locomotive factory in Colorado
Hi Evan Thanks for sharing you experience and those great photos and commentary. Cheers Allen.
|
A visit to a scale model steam locomotive factory in Colorado
I am in a tiny town called Strasburg, 36 miles (60km) east of Denver.? I was chatting to the camping ground staff about Goldmine Experience in Thames, and they told me that there is an engineering firm making scale model steam locomotives (about 19¡± gauge) just around the corner. Within walking distance.? It was 4 pm on Friday, but I ran over.? The 85 year-old owner (Marlin Uhrich) gave me a wonderful 2.5 hour tour of his private factory. ?He has all kinds of old manual machine tools (no CNC). He also has a foundry with a cupola furnace capable of melting 3 tons of cast iron. ?
?
I took loads of photos and talked about Goldmine Experience, when it suddenly dawned on me that he may be able to help with replacing the displacement oilers that were stolen from our steam engines. He said he has about 18 of them. I spotted two on the shelf and offered $50 each. He said he would take $75 each. This is a bit cheaper than the quote we had from a dealer in UK at 1250 pounds each plus shipping!? So I bought them both and will ship them from Tennessee to Thames later in May.
?
?
These are the oilers I bought.?
We call them displacement oilers, but he said they are hydrostatic Michigan oilers. ?
Our steam engines are British and this would be US terminology.
The one on the left needs minor repairs.
The sight glass is broken and it needs a new tap handle.
?
?
?
Marlin and I talking with his apprentice.
?
?
A steam locomotive they just completed and steamed up for the first time this week.
?
?
?
?
Another locomotive he has been working on for years.
?
?
?
?
?
?
Milling machine.
Ex US Air Force.
?
?
Apprentice pointing out a shaper. They are not used very much these days.
We had one at our High School in Te Puke, NZ.
?
?
A slotting machine like Nelson¡¯s.
?
?
?
?
The foundry shop.
These days he has more artists coming to cast art work, than actual engineers.
?
?
?
A large planar. Similar to a shaper but the work-piece moves backwards and forwards on the bed.
?
?
A small steam engine used to inject water into a boiler.
It has a displacement oiler.
?
?
?
The cupola furnace for producing molten cast iron for sand casting.
?
?
The foundry with a stack of sand casting boxes called copes and drags.
?
?
?
Here they are making a device very similar to a collet that is used to clamp the pipe of an oil drilling rig with an unusual diameter of 6-7/8 inches.? It was turned on a solid base, then 6 sections brazed before cutting slots using the dividing head seen in the next photo. When finished the brazing will be removed to release the 6 segments. Then hardened grippers are fitted inside to grip the pipe. (Rockwell hardness 65).
?
?
The milling machine set up to cut the slots. Radial head on the right.
?
?
The small hardened grippers.
?
?
Marlin¡¯s boiler.
?
?
?
A spinning lathe which he used for making oil lamps for railway carriages (see below).
?
?
Another workshop.
?
?
?
Overhead belt system driven by steam or electricity. It runs very quietly (Like Nelson¡¯s).
?
?
Crane.
?
?
?
One of the lamps he made from spun brass.
?
?
--
Evan
Lathe: 1955 Boxford Model A with screw cutting gearbox, power feed with several accessories, hand tools and a pillar drill press.
Try my Free Online Gear train Software:
You enter a thread pitch or TPI and it shows you a range of gear trains and gearbox setting to use and even a scale drawing of the gear train.
It also includes calculations for taper turning by the tailstock offset method, and cutting speeds.
It includes the specifications for many thread types eg metric, UNC, BSW, and BA.
Displays drill sizes for tapping threads at any percent thread depth (with full explanations).
My YouTube Channel and Playlist about using an engineers lathe: ?
Project to build a Greek Hero steam engine and measure its power output:?
|
I made a parting tool holder that holds the tool upside down on the back of the cross slide and run the motor backwards (with a clamp for the screw-on chuck). ?This works great. We had long discussions on the Boxford Users Group (io). ?I think the main difference is that the swarf drops out with gravity and does not get jammed in beside the cutting tool. There are many theories. ?Often I just use an ordinary QCTP and only bother to set up the reverse rotation if I am having trouble.
--
Evan
Lathe: 1955 Boxford Model A with screw cutting gearbox, power feed with several accessories, hand tools and a pillar drill press.
Try my Free Online Gear train Software:
You enter a thread pitch or TPI and it shows you a range of gear trains and gearbox setting to use and even a scale drawing of the gear train.
It also includes calculations for taper turning by the tailstock offset method, and cutting speeds.
It includes the specifications for many thread types eg metric, UNC, BSW, and BA.
Displays drill sizes for tapping threads at any percent thread depth (with full explanations).
My YouTube Channel and Playlist about using an engineers lathe: ?
Project to build a Greek Hero steam engine and measure its power output:?
|
I too use a "norman" style tool post, but mine is mounted on a 1.0 inch diameter post. I works quite well and I have been using it for about?20?years now. Drawings and photos are available.? Regards, John?Mattis (retired mechanical engineer)
On Fri, Apr 25, 2025 at 10:50?AM Mark Kimball via <markkimball51= [email protected]> wrote: I made a Norman style QCTP based on Ralph Patterson's drawings.? It has a large (~1.25") mounting post.? The tool holders are pretty beefy as well.? This all provides worry-free parting off, as long as the tool is sharp and at the proper height, and the compound gibs are properly adjusted.?
?
The first commercial QCTP I got for my lathe was just too lightweight.? That thing DID cause all kinds of headaches.
|
I've found parting to be much easier with a "T" shaped HSS blade, mounted with the minimum length of blade protruding out of the tool holder. It's worth the effort of modifying the tool holder to properly mount the blade.
?
Roy
?
?
|
I made a Norman style QCTP based on Ralph Patterson's drawings.? It has a large (~1.25") mounting post.? The tool holders are pretty beefy as well.? This all provides worry-free parting off, as long as the tool is sharp and at the proper height, and the compound gibs are properly adjusted.?
?
The first commercial QCTP I got for my lathe was just too lightweight.? That thing DID cause all kinds of headaches.
|
I part Al all the time with little problem...
toggle quoted message
Show quoted text
On 4/25/2025 11:13 AM, Ralph Hulslander via groups.io wrote: Once I parted aluminium successfuly, like a piece of butter, since then I
have had to use a hack saw for aluminium or steel.
On Thu, Apr 24, 2025, 10:56 PM Mike W via groups.io <mike.wilkens=
[email protected]> wrote:
Yesterday I had to part off some aluminum (6061), 24mm diameter, and
remembered that I had had endless trouble previously with this operation -
regardless of material.
So this time I took off the quick change toolpost and re-installed the
original four-way. The parting off process went smoothly with none of the
problems I'd encountered before. It did get jammed once - I was running
the motor too slowly. (I don't have a low gear anymore.) Didn't matter if
I used oil or not, or went fast or slow. It was as easy as any other
operation.
Something about how the QC extends over the compound - one of the weak
parts of these lathes - lessens the rigidity necessary to do this operation
well.
-Mike
|
I have had great success with a parting-off tool that takes a push-in insert (all metals). Always do it close to the chuck and never with a fixed steady or a tailstock centre.
Rgrds
MFS?
On Fri, 25 Apr 2025 at 17:13, Ralph Hulslander via <rhulslander= [email protected]> wrote: Once I parted aluminium successfuly, like a piece of butter, since then I have had to use a hack saw for aluminium or steel.
Yesterday I had to part off some aluminum (6061), 24mm diameter, and remembered that I had had endless trouble previously with this operation - regardless of material.
?
So this time I took off the quick change toolpost and re-installed the original four-way.? The parting off process went smoothly with none of the problems I'd encountered before.? It did get jammed once - I was running the motor too slowly.? (I don't have a low gear anymore.)? Didn't matter if I used oil or not, or went fast or slow.? It was as easy as any other operation.
?
Something about how the QC extends over the compound - one of the weak parts of these lathes - lessens the rigidity necessary to do this operation well.
?
-Mike
?
|
Once I parted aluminium successfuly, like a piece of butter, since then I have had to use a hack saw for aluminium or steel.
Yesterday I had to part off some aluminum (6061), 24mm diameter, and remembered that I had had endless trouble previously with this operation - regardless of material.
?
So this time I took off the quick change toolpost and re-installed the original four-way.? The parting off process went smoothly with none of the problems I'd encountered before.? It did get jammed once - I was running the motor too slowly.? (I don't have a low gear anymore.)? Didn't matter if I used oil or not, or went fast or slow.? It was as easy as any other operation.
?
Something about how the QC extends over the compound - one of the weak parts of these lathes - lessens the rigidity necessary to do this operation well.
?
-Mike
?
|
Yesterday I had to part off some aluminum (6061), 24mm diameter, and remembered that I had had endless trouble previously with this operation - regardless of material.
?
So this time I took off the quick change toolpost and re-installed the original four-way.? The parting off process went smoothly with none of the problems I'd encountered before.? It did get jammed once - I was running the motor too slowly.? (I don't have a low gear anymore.)? Didn't matter if I used oil or not, or went fast or slow.? It was as easy as any other operation.
?
Something about how the QC extends over the compound - one of the weak parts of these lathes - lessens the rigidity necessary to do this operation well.
?
-Mike
?
|
Re: New Lead Screw Bearings And Installing A Mystery Rod
I dunno what's up with that hex rod but I did something similar to address backlash in the lead screw.? I didn't use angular contact bearings, I used thrust bearings.? I did it by machining a replacement bearing? block, which has the same outside dimensions as the OEM version.? I saw no point in using steel so it's 6061 aluminum.
?
The job was done to improve the performance of my LS hand crank mod.? My LS is 16TPI so the Z motion is a little coarse compared to the cross slide and compound feed screws @20TPI.? I also added a DRO on the Z axis so it can function as a long-throw compound.....for some things.? I still need the top slide for threading so it's not going in the scrap bin.? But for a lot of stuff I can use the plinth, which is good in terms of improved rigidity.
?
Mark
|
Re: New Lead Screw Bearings And Installing A Mystery Rod
OK, that works. Yes, I Have seen this. That guy does some fabulous stuff. I have been subscribed for quite a while.
Thanks.
Sent from ProtonMail, Swiss-based encrypted email.
Sent with Proton Mail secure email.
toggle quoted message
Show quoted text
On Monday, April 21st, 2025 at 11:54 PM, mike allen via groups.io <animal@...> wrote: It's not you , it's me . that means that I sent a machining link to
a bunch of buds instead of the music link I thought I was sending .
try this
For some unknown reason I have been unable to post comments on youtube
now for a couple of years & I also no longer have the button to hit to
send the video to my TV .
sorry bout the link
animal
On 4/21/25 11:49 PM, Phil via groups.io wrote:
Is it just me?
I'm not seeing any kind of link. Youtube or something?
Sent from ProtonMail, Swiss-based encrypted email.
Sent with Proton Mail secure email.
On Monday, April 21st, 2025 at 11:45 PM, mike allen via groups.io animal@... wrote:
I just kinda tripped over this earlier tonite figured there may be some
vids here that some of ya folks may be interested in .
this is the one I watched , but the guy/gal has lots of good vids
|
Re: New Lead Screw Bearings And Installing A Mystery Rod
It's not you , it's me . that means that I sent a machining link to
a bunch of buds instead of the music link I thought I was sending .
try this
For some unknown reason I have been unable to post comments on youtube
now for a couple of years & I also no longer have the button to hit to
send the video to my TV .
sorry bout the link
animal
toggle quoted message
Show quoted text
On 4/21/25 11:49 PM, Phil via groups.io wrote: Is it just me?
I'm not seeing any kind of link. Youtube or something?
Sent from ProtonMail, Swiss-based encrypted email.
Sent with Proton Mail secure email.
On Monday, April 21st, 2025 at 11:45 PM, mike allen via groups.io <animal@...> wrote:
I just kinda tripped over this earlier tonite figured there may be some
vids here that some of ya folks may be interested in .
this is the one I watched , but the guy/gal has lots of good vids
|
Evan
John Mattis