1. #1
    I need to mount a 13mm drill chuck onto a stepper motor shaft (don't ask!)

    It seems most 13mm drill chucks come with a 1/2" female thread. Therefore I need a stepper motor shaft (M8) to 'drill chuck' thread widget/adapter ....obviously no such beast exists.

    Now then, I could lay out for a 1/2" 24tpi UNF die ...but this is a one off that I'll never use again...so that not very cost effective. Therefore I was wondering ...would it be do-able to just re-tap the drill chuck's existing female 1/2" 24tpi UNF thread...to be an M12? (because I already have metric taps/dies)

    Or will this be problematic?! (one issue jumps out, is that 12mm is slightly smaller than 1/2")

    (btw the end result - if I get there - will be under light load)

  2. #2
    Why not buy (or borrow) a 1/2" UNF bolt, cut the head off then drill it out to suit your stepper then put in a couple of grub screws in to hold it place.

    JD!

  3. #3
    Thinking about it, leave the head on then you can screw the chuck up to it and also put the grub screws through the flats on the head.

  4. #4
    Quote Originally Posted by HiltonSteve View Post
    Why not buy (or borrow) a 1/2" UNF bolt, cut the head off then drill it out to suit your stepper then put in a couple of grub screws in to hold it place.

    JD!

    Super idea.... I guess some folks know how to go about this the right way & some folks don't (I'll be in the latter camp - so thank heavens for forums like this!)

    (BTW: For once, I already have some suitable 1/2" 24tpi bolts!)

  5. #5
    Are you sure it's 1/2" x 24 ?

    Most chucks I have seen are 1/2" x 20 UNF
    BTW Steve if you 'borrow' a bolt what happens when the guy wants it back and you have gronched it up ? :question::question:

    .
    John S -

  6. #6
    I was basing the "borrow" coment on what people say to me when they want to "borrow" something, nine times out of ten I never see it again....!

  7. #7
    Quote Originally Posted by John S View Post
    Are you sure it's 1/2" x 24 ?

    Most chucks I have seen are 1/2" x 20 UNF
    BTW Steve if you 'borrow' a bolt what happens when the guy wants it back and you have gronched it up ? :question::question:

    .
    It's great to nestle in the bosom of those that know.

    I went and checked what I'd bought, transpires I bought a 10mm chuck (not a 13mm chuck)

    http://cgi.ebay.co.uk/ws/eBayISAPI.d...lenotsupported

    "3/8" x 24 thread."


    Fortunately, the bolts I have were specifically bought for it at the time (a failed idea that I had, that I can now re-use these bolts for)

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