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  1. #349
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    Mar 2011
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    Re: Best belt drive ever! (If I do say so myself)

    Also, how much down pressure is required between the idler rollers and the belt?
    Thanks

  2. #350
    Quote Originally Posted by tkms002 View Post
    Also, how much down pressure is required between the idler rollers and the belt?
    Thanks
    In answer to your previous question, yes the belt needs to be captured with side walls, flanges on the pulley or idlers do not work. As far as pressure between the idlers on the stack of two belts, no, no pressure. Close to zero clearance is best.
    Mike Visit my projects blog at: http://mikeeverman.com/
    http://www.bell-evermannews.com/ http://www.bell-everman.com

  3. #351
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    Mar 2012
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    Re: Best belt drive ever! (If I do say so myself)

    In my building gantry router cnc machine, 3 axis are through the timing belt drive connections to the ballscrews. No solid solution to the little non-synchronization between gantry drives or backlash are there then. May be the using of glass scale encoder is a solution. But it cannot be implemented in Mach3 environment under servo or stepper motor drive conditions. Presently, no step down gear ratio are used between the timing belt pulleys(Is it better than using small pinion to a large gear in term of backlash amount??). Two 32 teeth are linked with MT5 belt. Wider belt is more preferable in that case as well. Thanks.

  4. #352
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    Re: Best belt drive ever! (If I do say so myself)

    Has anybody ever implemented Mike's system by forming the bottom "belt" from epoxy using a real belt as a mold?

  5. #353
    Community Moderator ger21's Avatar
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    Re: Best belt drive ever! (If I do say so myself)

    I've seen a router where the bottom belt profile was machined into aluminum.
    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)

  6. #354
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    Re: Best belt drive ever! (If I do say so myself)

    Quote Originally Posted by ger21 View Post
    I've seen a router where the bottom belt profile was machined into aluminum.
    now if I only had a mill with the correct profile cutter. That would be the best way to go I would think

  7. #355
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    Re: Best belt drive ever! (If I do say so myself)

    Quote Originally Posted by tkms002 View Post
    now if I only had a mill with the correct profile cutter. That would be the best way to go I would think
    I personally think that would not be an improvement. If the lower belt wears enough that you need to change it out that would take 20 minutes. If the aluminum wears out how long will it take to change it out? Especially if you have to mill the aluminum first. T5 belt is so inexpensive it makes no sense to reinvent the wheel! Go with a wider belt if you think you need more ability to handle the force.

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