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IndustryArena Forum > MetalWorking Machines > Benchtop Machines > G0704 z axis belt drive question

Thread: G0704 z axis belt drive question

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  1. 02-28-2013, 05:14 AM #1
    kuyote
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    G0704 z axis belt drive question

    I have a 36t pulley, for the z axis. Can I remove the top spanner nut, and thread the pulley onto the remaining threads on the screw? There appears to be plenty of threads that will grab. This is for the stock acme screws.
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  2. 02-28-2013, 07:16 AM #2
    arizonavideo
    arizonavideo is offline Member
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    You need to at least set screw the pulley. Grind a flat on the shaft and it should be fine.

    With only one bearing you will have backlash but if the head slides easy it may keep preload on the nut and screw.

    The stock screw will have lots of friction so you will need a large stepper and a good amount of reduction to lift the head with a stock screw.

    A 13T to 36T and a 500 Oz or larger stepper might work but I haven't seen anyone do it yet.
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  3. 02-28-2013, 12:56 PM #3
    hoss2006
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    I have.
    Hoss

    [ame=http://www.youtube.com/watch?v=hCY47KN1tc8]G0704 Z Axis CNC with Stock Screws - YouTube[/ame]
    http://www.hossmachine.info - Gosh, you've... really got some nice toys here. - Roy Batty -- http://www.g0704.com - http://www.bf20.com - http://www.g0602.com
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  4. 02-28-2013, 04:55 PM #4
    kuyote
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    Excellent, thanks for the video Hoss, that is the same setup I have.
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