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I Need a 3 Jaw Chuck
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Hey guys, I have a 12" (101.07403) I've reached a level of frustration having on a 4 jaw chuck and am ready to get a 3 jaw.? I don't mind setting up the work in a 4 jaw but removing the work to check something and then having to re-chuck it is getting tiresome. There are a few on ebay currently of different brands with the 1 1/2- 8 threads.? (Atlas, Cushman, etc) Should I try one of the older used chucks or try a new Shars or something similar or stick with an old one?? I would like to find an Atlas 6" diam chuck but they aren't cheap.? Am I rolling the dice either direction with accuracy? Thanks for the input and advice. -Jody |
开云体育
Jody, Buck chucks are adjustable for runout and are cool. A bit pricier but worth it
Typos are courtesy of autocorrect.
From: [email protected] <[email protected]> on behalf of Jody <jp4lsu@...>
Sent: Saturday, April 18, 2020 2:44:42 PM To: [email protected] <[email protected]> Subject: [atlas-craftsman IO] I Need a 3 Jaw Chuck ?
Hey guys,
I have a 12" (101.07403) I've reached a level of frustration having on a 4 jaw chuck and am ready to get a 3 jaw.? I don't mind setting up the work in a 4 jaw but removing the work to check something and then having to re-chuck it is getting tiresome.
There are a few on ebay currently of different brands with the 1 1/2- 8 threads.? (Atlas, Cushman, etc)
Should I try one of the older used chucks or try a new Shars or something similar or stick with an old one?? I would like to find an Atlas 6" diam chuck but they aren't cheap.? Am I rolling the dice either direction with accuracy?
Thanks for the input and advice.
-Jody
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Thanks Andrei, I've come across some of them and yes a bit pricey.? Especially as I'm about to pony up for a new air compressor.? Maybe I can manage my frustration a bit longer to find a deal.? I was making spider for the lathe and thought it would be a good project for some experience and it became very frustrating and time consuming taking the work out of the chuck to test fit threads, flip around to bore ID on one end and clean up OD after work was completed.? Not to mention I don't have a QCGB so that added to time and frustration as well when switching back and forth boring, threading, boring & cutting. -Jody On Sat, Apr 18, 2020 at 1:46 PM Andrei <calciu1@...> wrote:
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开云体育
You can probably live with a cheaper 3-jaw for a while, if the compressor is a priority. But it is odd that you did not have a 3 jaw. That is the workhorse of a lathe and the 4-jaw comes always later. From: [email protected] <[email protected]> on behalf of Jody <jp4lsu@...>
Sent: Saturday, April 18, 2020 2:52:42 PM To: [email protected] <[email protected]> Subject: Re: [atlas-craftsman IO] I Need a 3 Jaw Chuck ?
Thanks Andrei,
I've come across some of them and yes a bit pricey.? Especially as I'm about to pony up for a new air compressor.? Maybe I can manage my frustration a bit longer to find a deal.? I was making spider for the lathe and thought it would be a good project
for some experience and it became very frustrating and time consuming taking the work out of the chuck to test fit threads, flip around to bore ID on one end and clean up OD after work was completed.?
Not to mention I don't have a QCGB so that added to time and frustration as well when switching back and forth boring, threading, boring & cutting.
-Jody
On Sat, Apr 18, 2020 at 1:46 PM Andrei <calciu1@...> wrote:
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I agree Andrei, 3 jaw is standard equipment.? This was my grandfathers lathe and he bought it from his brother who was an electrician and did a lot of conduit and maybe some work on boxes with it as well.? So maybe the 4 jaw met his needs better.? Maybe the 3 jaw went missing at some point as well. -Jody On Sat, Apr 18, 2020 at 2:23 PM Andrei <calciu1@...> wrote:
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toggle quoted message
Show quoted text
From: [email protected] <[email protected]> on behalf of Jody <jp4lsu@...>
Sent: Saturday, April 18, 2020 3:30:27 PM To: [email protected] <[email protected]> Subject: Re: [atlas-craftsman IO] I Need a 3 Jaw Chuck ?
I agree Andrei, 3 jaw is standard equipment.? This was my grandfathers lathe and he bought it from his brother who was an electrician and did a lot of conduit and maybe some work on boxes with it as well.? So maybe the 4 jaw met his needs better.? Maybe
the 3 jaw went missing at some point as well.
-Jody
On Sat, Apr 18, 2020 at 2:23 PM Andrei <calciu1@...> wrote:
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Not necessarily. The first (and so far only) chuck I bought for my TH42 is a Shars 4-jaw. It came with an Atlas-branded chuck shaped object that was so far out it's pitiful. I'm trying to get better at threading so I can make an ER32 chuck. And one of these days I'm going to take another shot at figuring out if it's one of the jaws or the scroll causing the problem.? Bill in OKC William R. Meyers, MSgt, USAF(Ret.) A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects. LAZARUS LONG (Robert A. Heinlein)
On Saturday, April 18, 2020, 02:23:44 PM CDT, Andrei <calciu1@...> wrote:
You can probably live with a cheaper 3-jaw for a while, if the compressor is a priority. But it is odd that you did not have a 3 jaw. That is the workhorse of a lathe and the 4-jaw comes always later. From: [email protected] <[email protected]> on behalf of Jody <jp4lsu@...>
Sent: Saturday, April 18, 2020 2:52:42 PM To: [email protected] <[email protected]> Subject: Re: [atlas-craftsman IO] I Need a 3 Jaw Chuck ?
Thanks Andrei,
I've come across some of them and yes a bit pricey.? Especially as I'm about to pony up for a new air compressor.? Maybe I can manage my frustration a bit longer to find a deal.? I was making spider for the lathe and thought it would be a good project
for some experience and it became very frustrating and time consuming taking the work out of the chuck to test fit threads, flip around to bore ID on one end and clean up OD after work was completed.?
Not to mention I don't have a QCGB so that added to time and frustration as well when switching back and forth boring, threading, boring & cutting.
-Jody
On Sat, Apr 18, 2020 at 1:46 PM Andrei <calciu1@...> wrote:
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开云体育?
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I went to ebay for a used one. Took a little searching but found one that
looked okay for a little over a hundred dollars plus
shipping. It arrived and I put it on my lathe and it checked out .005 out.? I
had reground the jaws in another chuck and was pleased so I ground the jaws
on this one and it turned out less than .0015 run out.? The reason for
buying another 3 jaw chuck was so I could have one set up for inside holding
and one for outside holding.? I also bought separate jaws sets from
ebay and that was a crap shoot but did allow me to save a good chuck with very
bad jaws. Chris in WA |
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Used Atlas or Buck VS decent quality Chinese.
This group is terrific, but sometimes gets obsessive about things like the TIR of a three jaw chuck.
I was taught from the beginning that one should always assume that the 3-jaw runout was most likely not adequate for the finished toerances. The solution was to set up your work flow so that the majority of the turned diameters, the facings and any internal diameters requiring high concentricity were all turned at once without removing the work from the chuck. That way, the runout of the chuck doesn't matter; the TIR would be the TIR of the lathe spindle, not the chuck. Then, if you were lucky and the back side of the piece only needed facing or a couple of diameters that you could turn in the original setup, you could remove the workpiece, put it back in the chuck, reversed, and face the remaining surfaces pretty well, even with some runout. If the back side also needed high tolerance concentricity with the front side, you went to a four jaw chuck and indicated the piece to tolerance. Or, if you had a good bored through hole, you could put the piece on an arbor between centers and finish turning the remaining diameters.
Now I'm not saying that it's not nice to have a 3-jaw with 0.0015" TIR. The question is, do you need it to do high quality work and how much are you willing to pay for that luxury. I'd certainly fix a 3-jaw that has 0.015" or 0.020" runout. I'd live with one with less. Of course if the chuck is badly bell mouthed, that would raise safety concerns and I'd re-grind the jaws.
I've been pretty happy with the decent quality Chinese 3-jaw I bought for my 10" Atlas and I don't even know what the TIR is. The convenience of having a 3-jaw is fabulous and the accuracy can be managed with good old fashioned technique.
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开云体育I rolled the dice on ebay and found an Atlas 3 jaw.? $115 after shipping.? I'll see how it works in a week or so. -Jody? Sent via the Samsung Galaxy S10+, an AT&T 5G Evolution capable smartphone 开云体育-------- Original message -------- From: Chris <chrisandjudy@...> Date: 4/18/20 3:09 PM (GMT-06:00) Subject: Re: [atlas-craftsman IO] I Need a 3 Jaw Chuck ?
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I went to ebay for a used one. Took a little searching but found one that
looked okay for a little over a hundred dollars plus
shipping. It arrived and I put it on my lathe and it checked out .005 out.? I
had reground the jaws in another chuck and was pleased so I ground the jaws
on this one and it turned out less than .0015 run out.? The reason for
buying another 3 jaw chuck was so I could have one set up for inside holding
and one for outside holding.? I also bought separate jaws sets from
ebay and that was a crap shoot but did allow me to save a good chuck with very
bad jaws. Chris in WA |
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On 04/18/2020 01:44 PM, Jody wrote:
Hey guys,Years ago I bought a Phase-II adjustable chuck (knockoff of a Buck Adjust-tru) and it was a wonderful improvement. Even though I had ground the tips of my old chuck, the grooves for the jaws were a little worn, and it never gripped perfectly. The new chuck with reversible jaws grips wonderfully, and can be adjusted so that almost any size part will immediately be within about .001" runout. I picked it up with one of the tool flyer companies had a sale going on. One of the best things I ever did! Jon |
开云体育On 04/18/2020 01:46 PM, Andrei wrote:
And, I think they stopped making these about 5 years ago.? There are import clones, I have a Phase-II. An 8" Buck Adjust-Tru chuck was listed at close to $1000 when they last made them. Jon |
开云体育
The Chinese SunOu chucks are pretty decent, if you can find them. Good enough for us, amateurs, maybe not as good for production.
Typos are courtesy of autocorrect.
From: [email protected] <[email protected]> on behalf of rfmarchi1 via groups.io <rfmarchi@...>
Sent: Saturday, April 18, 2020 4:25:42 PM To: [email protected] <[email protected]> Subject: Re: [atlas-craftsman IO] I Need a 3 Jaw Chuck ?
Used Atlas or Buck VS decent quality Chinese.
This group is terrific, but sometimes gets obsessive about things like the TIR of a three jaw chuck.
I was taught from the beginning that one should always assume that the 3-jaw runout was most likely not adequate for the finished toerances. The solution was to set up your work flow so that the majority of the turned diameters, the facings and any internal
diameters requiring high concentricity were all turned at once without removing the work from the chuck. That way, the runout of the chuck doesn't matter; the TIR would be the TIR of the lathe spindle, not the chuck. Then, if you were lucky and the back side
of the piece only needed facing or a couple of diameters that you could turn in the original setup, you could remove the workpiece, put it back in the chuck, reversed, and face the remaining surfaces pretty well, even with some runout. If the back side also
needed high tolerance concentricity with the front side, you went to a four jaw chuck and indicated the piece to tolerance. Or, if you had a good bored through hole, you could put the piece on an arbor between centers and finish turning the remaining diameters.
Now I'm not saying that it's not nice to have a 3-jaw with 0.0015" TIR. The question is, do you need it to do high quality work and how much are you willing to pay for that luxury. I'd certainly fix a 3-jaw that has 0.015" or 0.020" runout. I'd live with
one with less. Of course if the chuck is badly bell mouthed, that would raise safety concerns and I'd re-grind the jaws.
I've been pretty happy with the decent quality Chinese 3-jaw I bought for my 10" Atlas and I don't even know what the TIR is. The convenience of having a 3-jaw is fabulous and the accuracy can be managed with good old fashioned technique.
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toggle quoted message
Show quoted text
From: [email protected] <[email protected]> on behalf of Jon Elson <elson@...>
Sent: Saturday, April 18, 2020 4:32:28 PM To: [email protected] <[email protected]> Subject: Re: [atlas-craftsman IO] I Need a 3 Jaw Chuck ?
On 04/18/2020 01:44 PM, Jody wrote: Hey guys,Years ago I bought a Phase-II adjustable chuck (knockoff of a Buck Adjust-tru) and it was a wonderful improvement. Even though I had ground the tips of my old chuck, the grooves for the jaws were a little worn, and it never gripped perfectly. The new chuck with reversible jaws grips wonderfully, and can be adjusted so that almost any size part will immediately be within about .001" runout. I picked it up with one of the tool flyer companies had a sale going on. One of the best things I ever did! Jon |
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toggle quoted message
Show quoted text
From: [email protected] <[email protected]> on behalf of Jody <jp4lsu@...>
Sent: Saturday, April 18, 2020 4:27:59 PM To: [email protected] <[email protected]> Subject: Re: [atlas-craftsman IO] I Need a 3 Jaw Chuck ?
I rolled the dice on ebay and found an Atlas 3 jaw.? $115 after shipping.? I'll see how it works in a week or so.
-Jody?
Sent via the Samsung Galaxy S10+, an AT&T 5G Evolution capable smartphone
-------- Original message --------
From: Chris <chrisandjudy@...>
Date: 4/18/20 3:09 PM (GMT-06:00)
Subject: Re: [atlas-craftsman IO] I Need a 3 Jaw Chuck
?
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I went to ebay for a used one. Took a little searching but found one that looked okay for a little over a hundred dollars plus shipping.
It arrived and I put it on my lathe and it checked out .005 out.? I had reground the jaws in another chuck and was pleased so I ground the jaws on
this one and it turned out less than .0015 run out.? The reason for buying another 3 jaw chuck was so I could have one set up for inside holding
and one for outside holding.? I also bought separate jaws sets from ebay and that was a crap shoot but did allow me to save a good chuck with very bad jaws.
Chris in WA
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开云体育I guess you would need to make a back plate for it.? Looks pretty nice. -jody Sent via the Samsung Galaxy S10+, an AT&T 5G Evolution capable smartphone 开云体育-------- Original message -------- From: Andrei <calciu1@...> Date: 4/18/20 4:48 PM (GMT-06:00) Subject: Re: [atlas-craftsman IO] I Need a 3 Jaw Chuck
If that does not work, you can check this one out next:
Typos are courtesy of autocorrect.
From: [email protected] <[email protected]> on behalf of Jody <jp4lsu@...>
Sent: Saturday, April 18, 2020 4:27:59 PM To: [email protected] <[email protected]> Subject: Re: [atlas-craftsman IO] I Need a 3 Jaw Chuck ?
I rolled the dice on ebay and found an Atlas 3 jaw.? $115 after shipping.? I'll see how it works in a week or so.
-Jody?
Sent via the Samsung Galaxy S10+, an AT&T 5G Evolution capable smartphone
-------- Original message --------
From: Chris <chrisandjudy@...>
Date: 4/18/20 3:09 PM (GMT-06:00)
Subject: Re: [atlas-craftsman IO] I Need a 3 Jaw Chuck
?
?
I went to ebay for a used one. Took a little searching but found one that looked okay for a little over a hundred dollars plus shipping.
It arrived and I put it on my lathe and it checked out .005 out.? I had reground the jaws in another chuck and was pleased so I ground the jaws on
this one and it turned out less than .0015 run out.? The reason for buying another 3 jaw chuck was so I could have one set up for inside holding
and one for outside holding.? I also bought separate jaws sets from ebay and that was a crap shoot but did allow me to save a good chuck with very bad jaws.
Chris in WA
|
开云体育
Buck is no longer USA made, still nice though.
Maybe 2 years ago we got a new Bison "set true" 3 jaw chuck at work for a new CNC lathe. $900.00 for an 8" chuck with the back plate! Yikes!
It's ok.
Manual stuff with precision,4 jaw!
3 jaws are great for quick stuff and hex stock.
Dave
On April 18, 2020 at 5:03 PM Jeff Chadima <jeff.chadima@...> wrote: ? |
开云体育??? ??? I got my 6" 3 jaw with soft jaws & backplate from CDCO several years back& have been happy with it . you will have to do the backplate work before mounting , but ya need to do that with any threaded chuck ya get . ??? ??? I put just the backplate on the spindle backwards &
shaved almost 3/4" of the plate so as to cut down on the chuck
overhang ??? ??? animal On 4/18/2020 11:44 AM, Jody wrote:
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开云体育Buy one that requires a backing plate.? It will cost more to but the chuck and the backing plate, but it is probably the best way to get one that runs true to your spindle. ? Dan Coleman |
Bill in OKC too
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