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  1. #51
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 5 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,062. Received thanks 228 times, giving thanks to others 5 times.
    I'd try the setup as is. The worst case scenario is the belt flaps far too much and causes resonance problems, and you then have to add some idler pulleys.

    If it does need a couple idlers added, I would probably add a couple rollers to the top, to drop the belt down in the middle and increase wrap on the ballscrew pulleys.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  2. #52
    Rigged up a tensioner using stuff on hand - including a Subaru timing belt idler bearing:

    Click image for larger version. 

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  4. #53
    First movement!!!


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  6. #54
    First movement!!!
    I don't think it will cut anything without a Z axis
    ..Clive
    The more you know, The better you know, How little you know

  7. #55
    Quote Originally Posted by wallyblackburn View Post
    Rigged up a tensioner using stuff on hand - including a Subaru timing belt idler bearing:

    Click image for larger version. 

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    Be careful not to over tension because will deflect the ball screws causing whip when at opposite end of travel. It would have actually been ok without a tensioner thou it's better down out of the way.

  8. #56
    Quote Originally Posted by wallyblackburn View Post
    First movement!!!
    Thats not movement that's a twitch.!. . . . Let it have it's head to shake the gremlins out.
    Last edited by JAZZCNC; 11-03-2018 at 08:15 AM.

  9. #57
    Quote Originally Posted by JAZZCNC View Post
    Be careful not to over tension because will deflect the ball screws causing whip when at opposite end of travel. It would have actually been ok without a tensioner thou it's better down out of the way.
    Interesting. Iíll back off the spring pressure and adjust as needed when itís actually working.

    Thanks!


    Sent from my iPhone using Tapatalk

  10. #58
    Quote Originally Posted by wallyblackburn View Post
    Interesting. I’ll back off the spring pressure and adjust as needed when it’s actually working.

    Thanks!


    Sent from my iPhone using Tapatalk
    Yes, that long run of belt, I would have probably around 10mm of easy deflection in it - you really do not want to "twang" timing belts like guitar strings ;)

    As long as they are not flapping in the breeze, the tension does not affect accuracy as much as you might think, but it will wear things out, cause resonance and generally not be good.

  11. #59
    What do you guys typically use for steps per revolution on your drivers?

    Thanks,
    Wallace

  12. #60
    Quote Originally Posted by wallyblackburn View Post
    What do you guys typically use for steps per revolution on your drivers?

    Thanks,
    Wallace
    Totally dependant on the mechanical setup - pulley sizes etc

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