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  1. #1
    Member
    Join Date
    Jul 2006
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    11

    Question TTS R8 collet

    Are there any alternatives to purchasing an R8 to TTS collet from Tormach?
    $39.95 seems really steep for a simple R8.....

  2. #2
    Junior Member
    Join Date
    Apr 2013
    Posts
    1705

    Re: TTS R8 collet

    The end of the collet needs to be flat rather than slightly convex as with most R8 collets. I seem to recall that someone posted an alternate source a few months ago. I suppose that you could grind the end on a normal collet to be flat.

  3. #3
    Registered
    Join Date
    Aug 2016
    Posts
    114

    Re: TTS R8 collet

    Tormach chops 100 thou or so off the end of the collet to recess it in the spindle now. Other than that, it's a standard 3/4" R8 collet, which can be bought from anyone.

  4. #4
    Member
    Join Date
    Jul 2006
    Posts
    11

    Re: TTS R8 collet

    Do ya know if their collets are close enough to be able to use more than one, and still use the same tool offset?
    Or are there collets one-offs?

    oh, thanks for the replies.....

  5. #5
    Junior Member
    Join Date
    Apr 2013
    Posts
    1705

    Re: TTS R8 collet

    The collets do not affect tool offsets. The collet nose is flat which allows the rim of the TTS holder to contact the spindle nose which gives a consistent offset.

  6. #6
    Registered
    Join Date
    Oct 2012
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    42

    Re: TTS R8 collet

    A word of warning. Having tested lots of collets there is wide variation in hole parallelism and TTS contact area when the collet is gripping. TTS is dependent on full length gripping the 3/4 shank and some collets only grip one end or the other of the shank.

  7. #7
    Registered
    Join Date
    Oct 2017
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    62

    Re: TTS R8 collet

    I'd think you'd need a different offset for different collets. TTS nets off the ground surface after the collet is drawn hone with a 3/4" tool in place. Multiple collets would need to be identical from the taper to the nose.

    Bruce

  8. #8
    Junior Member
    Join Date
    Apr 2013
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    1705

    Re: TTS R8 collet

    I don't believe that you are correct. A properly functioning TTS holder is gripped by the collet but its vertical position is solely determined by the spindle nose.

  9. #9
    Registered
    Join Date
    Oct 2017
    Posts
    62

    Re: TTS R8 collet

    Yes, you are correct. The TTS collet draws its nose up into the spindle, so the datum surface is the surface of the spindle, not the collet end. My mistake, thanks for setting me straight!

    Bruce

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