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  1. #1
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    Default Keyway acceptable limits

    A question for you machinist guys, how much sideways play can a key have in its keyway...

    This is on a brand new machine thats been sent back for repair and this is the result they sent back


    ....................................................................

  2. #2
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    When I make them they're a firm push fit to a light tap fit. Key stock is usually slightly oversize, you file or grind it to a good fit.

    That key/recess is waaaay too sloppy. I could do better with a chisel and angle grinder.

    PDW

  3. #3
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    How much play you ask. Zero in my opinion. That is disgraceful.
    Nev.

  4. #4
    elanjacobs is offline Furniture maker and machine doctor
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    Default

    That keyway looks pretty chewed up anyway, just peen the sides over to hold the key tight

  5. #5
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    Default

    What does the key do?
    Looking at the finish on the shaft I am guessing it's not very critical, if it is critical I would be chasing better surfacefinish on the shaft, based on your photo it looks pretty rough and not capable of holding anything true for long.

  6. #6
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    It is a critical part as the shaft can be torqued in either direction and play against its opposing drive shaft will create problems as they need to rotate in unison, its a electric driven bead rolling machine.
    Thats the drive shaft that transfers into a stepped/offset gearbox to increase the depth capacity between the upper and lower shafts.
    ....................................................................

  7. #7
    elanjacobs is offline Furniture maker and machine doctor
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    Default

    Given that it's a new machine that already needs repair and the finish on both the turning and milling, would it be a fair guess that it's a fairly cheap piece of gear and you've simply got what you paid for?

  8. #8
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    A lot depends on what the key is doing. Years ago I had to file off half of a camshaft pulley key to get the cam timing correct in a competition engine intending to get it corrected after the imminent race meeting. The engine had to run for 6+ hours at speeds of up to 10,000 RPM. Two years later it was still operating perfectly when I built a replacement engine. In this case the load was not on the key but on bolt pushing the pulley against a flange on the camshaft.
    It depends on what the key is doing.

    Roger

  9. #9
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    Quote Originally Posted by elanjacobs View Post
    Given that it's a new machine that already needs repair and the finish on both the turning and milling, would it be a fair guess that it's a fairly cheap piece of gear and you've simply got what you paid for?
    Nope not a cheap bead roller, it aint no billet CNC'd Mitler Bros or top end Baileigh thats for sure but its no ebay special either, its a nearly 2k machine
    ....................................................................

  10. #10
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    if you have a engineers black book it has fits for keyways to the Australian standards. I don't have mine in front of me but to size or slight interference is standard, never clearance.

  11. #11
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    Laidley, SE Qld
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    Default

    If you can mention what bead roller you bought and where from that will be useful information to potential buyers.

    What failed and why, what sort of repair was necessary?

    Quote Originally Posted by Harry72 View Post
    It is a critical part as the shaft can be torqued in either direction and play against its opposing drive shaft will create problems as they need to rotate in unison, its a electric driven bead rolling machine.
    Thats the drive shaft that transfers into a stepped/offset gearbox to increase the depth capacity between the upper and lower shafts.

  12. #12
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    I wont reveal the brand/shop until I see what direction they take
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  13. #13
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    Default

    Based on the repair I am guessing SOUTH.

  14. #14
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    Default

    I think you already revealed it in one of your previous posts

  15. #15
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    Yes Com VC a good deduction dear Watson

    I've just been on the blower with them they have agreed to send a new machine out, they're on back order expected approx end of May.
    I asked them to look into the key sizing and placement on the shaft, Im thinking the key isn't full engaged into the drive cog and could be resolved by increasing the key and slot length to fully engage the cog... I just hope they get a proper fitter/turner machinist to look at it as they may have many more returns in future.
    It is a new machine line for them, possibly not from their regular manufacturers.
    ....................................................................

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