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IndustryArena Forum > Mechanical Engineering > Linear and Rotary Motion > Timing pulley slipping on gearbox shaft
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  1. #1
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    Timing pulley slipping on gearbox shaft

    Im not certain this is the correct forum category for this question... if not, please recommend correct forum topic.
    I have a custom built CBC Hotwire machine with 2 animatics motors (x&y), Apex dynamics gear boxes connected to steel timing belt pulleys. The x pulley is slipping a little. Enough to make circles with opposing flat sides. The x gearbox shaft key is worn & The 2 set screws have worn into the shaft a little. I can still run machine but it’s off a little due to x axis timing pulley play on shaft. New gearbox is $1,100 min. Looking to attempt fix before buying new gearbox and pulley because it will probably wear new shaft again. Looking for a suggestion on the strongest locking type pulley on the shaft to avoid future slip & wear on shaft and pulley key slot. I.E. adding flat sides to shaft for set screws, adding more set screws on new pulley, custom fabricating a timing pulley onto taper bushing? Or other ideas. This is probably a common issue I’d imagine.
    Thanks Bill
    Attached Thumbnails Attached Thumbnails C649388D-7FFF-4DDB-9185-8FEF5424BF54.jpg  
    Last edited by WilliamKinsey; 06-15-2019 at 06:56 AM.

  2. #2
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    Re: Timing pulley slipping on gearbox shaft

    Hhy don't you just remove the setscrews one at a time and drill a hole in the shaft and replace?
    Rod Webster
    www.vehiclemods.net.au

  3. #3
    Community Moderator ger21's Avatar
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    Re: Timing pulley slipping on gearbox shaft

    Put loctite on the shaft and pulley.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

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    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  4. #4
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    Re: Timing pulley slipping on gearbox shaft

    Thx or idea. do you recommend the strongest Loctite? Could I still pull of the pulley later on with pulley puller?

  5. #5
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    Re: Timing pulley slipping on gearbox shaft

    not sure if reply went thru. thanks for suggestion. I think that would help. I'll probably broach a new key slot in the pulley bore too. add a couple more set screws. and loctite everything.

  6. #6

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    Re: Timing pulley slipping on gearbox shaft

    Hi William - I Only use loctite on my pulleys. No screws or keys. I use permanent grade loctite. If you ever need to get them off a little heat from a heat gun and they come off easily. But the plan is for them never to come off. Peter

    The Difference Between Red, Blue, Green and Purple Threadlockers - Henkel Adhesive Technologies Blog

  7. #7
    Community Moderator ger21's Avatar
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    Re: Timing pulley slipping on gearbox shaft

    Quote Originally Posted by WilliamKinsey View Post
    Thx or idea. do you recommend the strongest Loctite? Could I still pull of the pulley later on with pulley puller?
    Yes, I'd use red loctite. If you need to remove it later, heat it with a torch, and you'll be able to pull it off.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  8. #8
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    Quote Originally Posted by ger21 View Post
    Yes, I'd use red loctite. If you need to remove it later, heat it with a torch, and you'll be able to pull it off.
    Thanks for info????

  9. #9
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    Thank you for the recommendation. And link. Whatever I end up doing loctite will be involved.

  10. #10
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    Re: Timing pulley slipping on gearbox shaft

    If you have a gap to fill as a worn shaft you might look at the Green Loctite, read the spec's before deciding.
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router

  11. #11
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    Re: Timing pulley slipping on gearbox shaft

    Thanks for input. ‘I’ll check out green loctite

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