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Repairing A Keyway Question.

Discussion in 'QUESTIONS & ANSWERS (Get Help Fast Here!)' started by savarin, Dec 4, 2016.

  1. savarin

    savarin Active User H-M Supporter-Premium

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    I am re-visiting some earlier rough work on my telescope in an effort to improve things.
    I originally cut a 3mm keyway in a 12mm shaft that skewed slightly so I want to recut it straight.
    Also making new tight fitting keys.
    What would be the better method?
    Using the original 3mm end mill and make two cuts in the old keyway widening it by .5mm each side producing a 4mm keyway
    or
    using a 4mm end mill and cutting over the original keyway cutting both sides at the same time also producing a 4mm keyway.
    Unfortunately without a mill I cant use a woodruff cutter.
     
  2. David S

    David S Canada Active User H-M Supporter-Premium

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    I am not an expert, but I think your first suggestion would be best.

    David
     
  3. Ebel440

    Ebel440 United States Active User Active Member

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    Use the 3mm and 2 cuts. The 4mm could cut oversize.
     
    talvare likes this.
  4. savarin

    savarin Active User H-M Supporter-Premium

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    3mm x 2 cuts sounds good to me. Thanks
     
  5. Ulma Doctor

    Ulma Doctor Infinitely Curious H-M Supporter-Premium

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    i agree, 3mm x 2 ! good luck Sav!
     
  6. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    If you go to 4 mm you will also have to make the depth deeper in both pieces if you use a standard square key. You can machine a key to a custom dimension (3 x 4mm) to fit instead.
     
  7. savarin

    savarin Active User H-M Supporter-Premium

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    Ha Ha Bob, the accuracy of my machining means I have to make everything to fit what I did before.:laughing:
     
  8. 12bolts

    12bolts Global Moderator Staff Member Active Member

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    Charles,
    Could you mount a woodruff cutter in your chuck and use your vertical slide to move the shaft. Might be a bit iffy getting in there that close to the chuck?

    Cheers Phil
     
  9. savarin

    savarin Active User H-M Supporter-Premium

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    maybe next time Phil.
    Its done
    keyways-cut.jpg
    keyways.jpg
    way better that the original but still not perfect. Hopefully good enough.
     
  10. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    Oh, yes, I know that story well... Cut to fit, paint to match... 8^)
     
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  11. bfd

    bfd United States H-M Supporter - Premium Content H-M Supporter-Premium

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    bob its cut to size beat to fit paint to match ha ha ha bill
     
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  12. dave_r_1

    dave_r_1 Canada Active Member Active Member

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    my work resembles that...except for the paint to match...
     

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