Set thru type chuck

[swd]

So yall get a set tru and not use it as a set tru chuck, just leave it alone? The whole point in a set tru chuck is to be able to move it and not lose grip on the part

This ^^^^

 

[shortgrass]

I have found that the set trues are like most other scroll chucks, they don't repeat when opened and closed. Close, but not perfect.

They are 'good' for several parts of the same OD, but after that you should check 'um.

 

[Dusty Stevens]

I like buck chucks, bison are acceptable but the cheapest id recommend. Bucks seem to repeat a lot better. But a set tru is adjustable for that reason. If you loosen the jaws its best to check your work

 

[shortgrass]

Bison was pretty good when they were made in Poland, but they have moved else where. I have owned this Buck I have long enough that was "Made in the USA".

 

[tobnpr]

Set tru chucks- "good" ones that aren't clapped out and bell-mouthed- are for second ops, same as a four jaw- or collets. Damn near collet accuracy without needing to screw with collets or be limited by their size, or the need to dial in a 4-jaw.

I just got my 8" and am waiting for the backplate, my 6" six-jaw is repeatable to . 0002-.0003 with anything i chuck up.

 

[AckleymanII]

I have a 6 Jaw buck chuck and outboard spider. I dial in a barrel darn quick.

I use a heavy copper winding that came off a very large electric motor in a wrap around the barrel shank located where the throat will be.

When I dial in to the 0.0000, then chamber, there is no run out, then turn shank and thread. Run out in the new throat comes from taking heavy threading cuts which is NEVER more than .0003 on a bad day. Taking smaller cuts turning the shank and threading translates to more time spent, but also .0000-.0001 run out MAX.

Takes less than a minute to check your work in the various stages.

 

[Dusty Stevens]

I have a 6 Jaw buck chuck and outboard spider. I dial in a barrel darn quick.

I use a heavy copper winding that came off a very large electric motor in a wrap around the barrel shank located where the throat will be.

When I dial in to the 0.0000, then chamber, there is no run out, then turn shank and thread. Run out in the new throat comes from taking heavy threading cuts which is NEVER more than .0003 on a bad day. Taking smaller cuts turning the shank and threading translates to more time spent, but also .0000-.0001 run out MAX.

Takes less than a minute to check your work in the various stages.

I like to totally shank em up then go back and dial em in again to make sure its still on. I take extremely heavy thread cuts compared to what you do. My final cut is .005

 

[AckleymanII]

Dusty, pardon my being thick headed, what is "shank them up" to you?

I tried taking .005 cuts on threading for the first three cuts, then .003, then .002, then .001 or less. Has me scratching my head on how things are moving around. I figure that the copper is compressing from side pressure, but that is a WAG on my part. Always looking for a better way, not quicker. Keeping the alignment is what I strive for...what ever it takes. Old pharts got to play!!!

 

[Dusty Stevens]

Dusty, pardon my being thick headed, what is "shank them up" to you?

I tried taking .005 cuts on threading for the first three cuts, then .003, then .002, then .001 or less. Has me scratching my head on how things are moving around. I figure that the copper is compressing from side pressure, but that is a WAG on my part. Always looking for a better way, not quicker. Keeping the alignment is what I strive for...what ever it takes. Old pharts got to play!!!

Yes i mean totally fit the barrel shank and set the nose spacing since threading and setting up the shank is probably where youll get knocked off if anywhere. If its moving during your threading at .005 you need to revisit everything from your tool, oil, and chuck setup. I use 10awg romex wire stripped to copper. I take .020 a pass threading with no issues

 

[AckleymanII]

Thanks Dusty! I am using a thickness of about 12 awg. Also, with my lathe, it maybe what I just have to live with, but will turn over a few rocks to look for more Easter Eggs.

 

[Dusty Stevens]

Thanks Dusty! I am using a thickness of about 12 awg. Also, with my lathe, it maybe what I just have to live with, but will turn over a few rocks to look for more Easter Eggs.

Spiders are notorious for slipping under chatter. Try some aluminum

 

[Danny1788]

Spiders are notorious for slipping under chatter. Try some aluminum

I replaced all my aluminum/copper spiders with steel ball bearings and feet. But I still use the 1/4” copper grounding wire around the barrel on the 6jaw because clamping force doesn’t change when adjustments are made. Their is no change.

 

[Bamban]

Any 4J combination chuck users here?

 

[coontz74]

I take .020 a pass threading with no issues

Whoa......that’s quite a bite while threading.....clamped down with a cheater bar, I couldn’t/wouldn’t take that big of a cut.....my nerves would explode.....

 

[Dusty Stevens]

Whoa......that’s quite a bite while threading.....clamped down with a cheater bar, I couldn’t/wouldn’t take that big of a cut.....my nerves would explode.....

Give it a try. I used to take .005 or so but stan taylor convinced me to take some real cuts. Once you get set up good youll love it

 

[sdean]

Give it a try. I used to take .005 or so but stan taylor convinced me to take some real cuts. Once you get set up good youll love it

If it came from Stan I might give it a try. I think he invented lathes.

 

[Walt Krafft]

I usually go .020, .010, .010, .010, a couple of spring passes, .005, .005, .005, .005, .003, spring passes until it doesn't cut anything and it is usually done on a 1.062-16 thread. Straight in feed. 800 rpm. Positive cutting carbide insert. Flood coolant.

 

[Dusty Stevens]

Anybody ever use a shars chuck? Says theyre certified to .0005tir and are a third or more off a gator or buck or bison

 

[coontz74]

Anybody ever use a shars chuck? Says theyre certified to .0005tir and are a third or more off a gator or buck or bison

Long answer......
I have some machinists friends that buy a lot of Shars products and recommend them to me constantly. They are not gunsmiths, but a couple of them are known around here for the go to’s on extremely accurate parts.

Short answer......
They like Shars chucks...

 

[Dusty Stevens]

Long answer......
I have some machinists friends that buy a lot of Shars products and recommend them to me constantly. They are not gunsmiths, but a couple of them are known around here for the go to’s on extremely accurate parts.

Short answer......
They like Shars chucks...

Ive bought a lot of stuff from them i dont use much like 1-2” thread mics and other tooling and its been fine every time.