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Belt & Pinion Example

Discussion in 'Other Builds' started by Mark Carew, Nov 10, 2013.

V-Slot™ Belt & Pinion Example Build

V-Slot™ Belt & Pinion Example Build

Discussion in 'Other Builds' started by Mark Carew, Nov 10, 2013.

The OpenBuilds team has redefined the belt and pinion concept. By using standard OpenBuild components were able to improve on this system in ways that will save on cost and enhance its engineering capabilities.

belt & pinion openbuilds drive vslot v-slot
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  1. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Does the belt fit easily between the sides of the V-track? In the photos, it looks to be too wide.

    I have to agree with the others suggesting solid wheels. That will spread the pressure across the belt better. You can see how much it is flexing between the points of the V-wheels.
     
    #31 Rick 2.0, Feb 14, 2014
  2. Mark Carew

    Mark Carew OpenBuilds Team
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    The new belt does @ 5mm width :) We noticed this happening on the old 6mm wide belt and moved to cut a half millimeter off on each side and this leaves room for the belt to lay in the track with out any obstructions.
     
    #32 Mark Carew, Feb 14, 2014
  3. CutAboveZ

    CutAboveZ New
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    Ha! good one!
    Back to the drawing mouse pad :)
    Thanks!
     
    #33 CutAboveZ, Feb 14, 2014
  4. Mark Carew

    Mark Carew OpenBuilds Team
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    The model located in the Files tab above for this build, has been updated with the OpenBuilds Solid V Wheels This system works awesome with these :thumbsup:
     
    #34 Mark Carew, Mar 31, 2014
  5. dddman

    dddman Journeyman
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    How did you cut a half millimeter of the belt?
     
    #35 dddman, May 6, 2014
  6. Mark Carew

    Mark Carew OpenBuilds Team
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    With a belt slicing machine :) Well really our manufacturer does it for us on these special order belts.
     
    #36 Mark Carew, May 6, 2014
  7. Robert J Rissell

    Robert J Rissell New
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    Coming in late.. Maybe just an observation but the original concept looks to have 2 differences... One: The idler pulleys on kram242 seem to be further apart and closer in the Z direction; having the end effect that the belt is at a 45 degree angle as opposed to the nearly 90 degree angle seen in Robert's example picture. This would have a < 160 degree wrap on the pinion and less than 90 degree contact area on the idlers.

    Perhaps this results in less friction and wear?

    Two: The original example of the double v-wheel would seem to eliminate (or minimize) the drifting of the belt from side-to-side.
     
    #37 Robert J Rissell, May 25, 2014
  8. Razzys

    Razzys New
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    Has anyone tried this system using GT3 belts?
     
    #38 Razzys, Feb 2, 2015
  9. Mark Carew

    Mark Carew OpenBuilds Team
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    Yes, I have the GT3 pulleys and GT3 belt on my OX build in place of the GT2 and I have to say its a much more robust system because of the GT3 belts.
    Hope this helps
    Mark
     
    #39 Mark Carew, Feb 2, 2015
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  10. G-Force

    G-Force New
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    Hi Mark,
    Just new to the GT3 belt drive, but I am wondering how you join them in a build? Am about to order some parts, but not sure about this part of it.
    Any help here would be great.
    Thanks.
    Glen
     
    #40 G-Force, Feb 14, 2015
  11. GrayUK

    GrayUK Openbuilds Team Elder
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    The reply, as in the other similar post you have made, is the same.
    The belts are not joined, but clamped, in one form or another, at each end of the v-slot run, after being threaded around the pinion wheel. Be that X axis or Y axis.
    Nowadays the 1st belt, is accompanied by another belt, which is laid within the slotted aluminium beneath the other, creating a "rack and pinion" effect.
    Please try to read, and take a look at some of the videos, on the Forum, to give you a better idea of how the various CNC set-ups works.

    Cheers
    Gray
     
    #41 GrayUK, Feb 14, 2015
  12. Darren Ditto

    Darren Ditto New
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    I'm just going down this route now with my build. I'm using belt and pinion with mini-wheels. Thinking I may have to redesign how the belt is held in place based on what I am reading here. (When I try to tighten the screw it rotates the belt out of alignment so I can't get a belt that is super tight and also in alignment.) I like what Robert is doing. I might have to rig up something like that and have the belts pass outside of the case and loop back in where they are attached.

    [​IMG]
    [​IMG]
     
    #42 Darren Ditto, Apr 26, 2015
    GrayUK and Mark Carew like this.
  13. R_B

    R_B New
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    I agree, the wheels run in a groove that they contact at a smaller diameter than their full rolling diameter - which translates to rolling circumferences.
    There is either belt slip on the wheels or wheel skid in the grooves - wear patterns should indicate which.

    How much, how significant and whether this is a good or bad thing... more thunking required.
    i.e. might it put some drag tension into the system and reduce backlash/slop ?
     
    #43 R_B, Jul 24, 2015
  14. Mark Carew

    Mark Carew OpenBuilds Team
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    I see what you mean by this, but to be honest we have not noticed any issues like this to date and all the systems we have used the belt an pinion for have been working great. From super accurate 3D printers to lasers to routers with no problems.
    However adding idlers would not be too difficult for these and may be the best way to build it to ensure no worries here.
    Good thinking guys, thanks for the feedback :thumbsup:
    Mark
     
    #44 Mark Carew, Jul 27, 2015
  15. jkmcc13

    jkmcc13 New
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    First post here,

    Looking to use this setup on my 3d printer design. Looking to use this for a crane style z axis.

    What kind of resolution you guys able to get and do you think a nema 17 will have enough torque to lift vertically? I don't need speed : ) I'll try to do the math, but not sure I can figure it out haha
     
    #45 jkmcc13, Aug 19, 2015
  16. finalcountdown

    finalcountdown New
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    What is the advantage/disadvantage of using vslot aluminium as a gantry plate (please see the attached)?

    Does it make it more stronger, durable?
     

    Attached Files:

    #46 finalcountdown, May 5, 2016
  17. Haqeekjavid Shaikh

    Haqeekjavid Shaikh New
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    i wanted to use it for my 3d printer ..... wud it make a gud z axis ??? ..... i mean wud it hold the extruder ...... wud it effect the resolution ???........ using it instead of lead screw .!!
    pls help .... thank you
     
    #47 Haqeekjavid Shaikh, Feb 14, 2017
  18. Ben Streeter

    Ben Streeter New
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    Late to the party, but these posts have all made me think harder about how this nice little actuator....err....actuates. I agree that mis-matched v-groove pulleys and pinion diameter will cause the wheels to skid or belt to slip agianst the v-groove pulleys. I was thinking there might be another explanation....if v-goove pulleys are used allowing the belt to pull inwards into the groove, does it pull in and sort of 'auto adjust' until it finds the equivalent diameter where the belt wont slip/wheels wont slip any more? Kind of like the pulley in a constantly variable transmission (CVT)? The effective diameter of the pulley is reduced because the belt is pulled in to its groove?

    Just thinking out loud. I really like this concept....it is allowing me to make a nice tight gantry for a project. I love openbuilds in general. Great stuff!
     
    #48 Ben Streeter, Aug 28, 2017
  19. Ben Streeter

    Ben Streeter New
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    A little more information about the type/configuration of printer you are making would make your question easier to attempt to answer.
     
    #49 Ben Streeter, Aug 28, 2017
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