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Thread: 3 jaw chuck

  1. #16
    Join Date
    Jul 2016
    Location
    Colorado
    Posts
    95
    I have a nice 4-jaw but have used the set-tru 3-jaw for virtually everything. I actually two of them and a set-tru collet chuck. After using those I dislike the 4-jaw unless it's an odd shape I have to hold.

  2. #17
    Join Date
    Jul 2005
    Posts
    628
    Quote Originally Posted by RussellJ View Post
    There are 3-jaw lathe scroll chucks that can be be adjusted right on the lathe, all the manufactures below claim .0005" TIR repeatability.

    Buck Chuck called their chuck: Adjust-Tru chuck
    Pratt Burnard (PBA) calls their chuck: EZ-Set chuck
    Kalamazoo Chuck Mfg. calls their chuck: Micro Set
    Bison calls their chuck: SET-TRU
    Not all that useful when you want 0.0001

  3. #18
    Join Date
    Oct 2015
    Location
    Southwest VA
    Posts
    66
    The set tru or adjust tru chucks are super useful in the machine world and are excellent choices for rifle barrel work. You can dial in a rifle bore to under .0001 easy with good 4 groove cut rifle barrels and a set tru chuck. I have two 3 jaw and one 6 jaw set tru chucks. I would never go back to independent 4 jaw for rife barrel indicating. These things are worth every penny!

  4. #19
    Join Date
    Oct 2019
    Posts
    554
    sorry but it can be done, you are mistaken.
    bbl chambering,'

    Quote Originally Posted by brickeyee View Post
    Not all that useful when you want 0.0001

  5. #20
    Join Date
    Jan 2009
    Location
    Ca.
    Posts
    824
    One might be able to get it too .0001 and might being the key. But it won't remain there very long so not very realistic as any temp change would actually change it. Divide it by two per each side and you are looking at pretty much it being an impossibility.

  6. #21
    Join Date
    Oct 2019
    Posts
    554
    sorry but it just aint true.
    temp control in shop helps
    but
    temp works on all expansion..not just one direction.
    and its a 3 , so no pairs.

    set it up do the job move on

    Quote Originally Posted by Louis.J View Post
    One might be able to get it too .0001 and might being the key. But it won't remain there very long so not very realistic as any temp change would actually change it. Divide it by two per each side and you are looking at pretty much it being an impossibility.

  7. #22
    Join Date
    Nov 2006
    Location
    Augusta, Maine & Palm Coast, Fl
    Posts
    6,400

    Something one can do

    to their 3 jaw chuck to true it up is to fit the backing plate a few though smaller where it registers and then knock the chuck into alignment and finally tighten it up when it runs as true as one can get it. I did that to my Chinesium 3 jaw and got it to a few tenths.

    Pete

  8. #23
    Join Date
    Oct 2019
    Posts
    554
    it's an ADJUSTABLE 3 JAW CHUCK grip in the jaws, adjustment on the od
    Quote Originally Posted by Pete Wass View Post
    to their 3 jaw chuck to true it up is to fit the backing plate a few though smaller where it registers and then knock the chuck into alignment and finally tighten it up when it runs as true as one can get it. I did that to my Chinesium 3 jaw and got it to a few tenths.

    Pete

  9. #24
    Join Date
    Jan 2015
    Location
    Greenwood, Ca
    Posts
    229
    Chances are, temperature is not going to affect the runout much on a round part rotating in a round spindle.

    That said, I still bite my tongue when ever I see a gunsmith/rifle builder claiming tolerances that literally can’t be qualified in a home shop, or many “real” machine shops for that matter. Sure, I strive to have minimal to no visible runout on a tenth DTI, but I’m never going to claim machining to “better than a tenth”, because quite frankly, I’ve no way to qualify it. Investing in that metrology isn’t something I feel would pay off for a rifle builder.

  10. #25
    Join Date
    Oct 2019
    Posts
    554
    i did not see anyone say "machine to less than.0001".
    nor "better than a tenth"
    what i said was that dialing in to .0001 is possible in an adjustable 3 jaw chuck.

    Quote Originally Posted by Rubicon Prec. View Post
    Chances are, temperature is not going to affect the runout much on a round part rotating in a round spindle.

    That said, I still bite my tongue when ever I see a gunsmith/rifle builder claiming tolerances that literally can’t be qualified in a home shop, or many “real” machine shops for that matter. Sure, I strive to have minimal to no visible runout on a tenth DTI, but I’m never going to claim machining to “better than a tenth”, because quite frankly, I’ve no way to qualify it. Investing in that metrology isn’t something I feel would pay off for a rifle builder.

  11. #26
    Join Date
    Jan 2015
    Location
    Greenwood, Ca
    Posts
    229
    Quote Originally Posted by rsmithsr View Post
    i did not see anyone say "machine to less than.0001".
    nor "better than a tenth"
    what i said was that dialing in to .0001 is possible in an adjustable 3 jaw chuck.
    How do you qualify .0001”?

  12. #27
    Join Date
    Feb 2003
    Location
    Tennessee
    Posts
    6,564
    Quote Originally Posted by Rubicon Prec. View Post
    How do you qualify .0001”?

    With an Interapid dial indicator 0.00001??

    ,

  13. #28
    Join Date
    Oct 2019
    Posts
    554
    this is getting childish
    my indicators have marks on the dial.
    there are gaps between the marks.
    one can SEE less than .0001, but it is not a number.
    one can adjust to .0001 with time, a quality lathe and a quality indicator.

    i machine, i do not "qualify".

    Quote Originally Posted by Rubicon Prec. View Post
    How do you qualify .0001”?

  14. #29
    Join Date
    Jan 2009
    Location
    Ca.
    Posts
    824
    Rubicon Prec. I totaly agree all this does is to turn off the new folks from even trying to do their own barrel work. Besides that the price of a precision tool room lathe that possibly could is not even in the budget for most job shops let alone for a home hobby shop. What we should be talking about is what would be the acceptable tolerance be on the higher side and one that could be easily achieved on a typical home hobby gunsmithing lathe or an equal too. We need to encourage and not to discourage them from doing their own work.
    Last edited by Louis.J; 02-27-2021 at 01:52 PM.

  15. #30
    Join Date
    Oct 2019
    Posts
    554
    i paid $4600 for a 2 year old $12000 lathe (prices at the time).
    it was 220 3 phase...little "home" market. taken in trade by a commercial machine sales company.

    you are pretending that "because you cannot do it, or believe it cannot be done" we should not talk about it.
    bs
    rubicon is a FOR PROFIT BUSINESS...and as such does not fit in a discussion on home machinist.

    i am done

    Quote Originally Posted by Louis.J View Post
    Rubicon Prec. I totaly agree all this does is to turn off the new folks from even trying to do their own barrel work. Besides that the price of a precision tool room lathe that possibly could is not even in the budget for most job shops let alone for a home hobby shop. What we should be talking about is what would be the acceptable tolerance be on the higher side and one that could be easily achieved on a typical home hobby gunsmithing lathe or an equal too. We need to encourage and not to discourage them from doing their own work.

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