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Large OX (3000x1500) - Double Belt Stretch Issue

Discussion in 'CNC Mills/Routers' started by Matt Jones, Jun 17, 2019.

  1. Matt Jones

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    Hi Team,

    I have built a 3m x 1.5m x 0.4m beefed up OX cnc router (by beefed up I mean using 2080 with larger gantry plates and lots of supports and bracing). I am using the belt and pinion system with GT2-2mm belt for my x and y axis with the double belt set up.

    My issue is I am getting lots of belt stretch along my long axis and a smaller amount but still too much along my shorter axis.

    Is there a trick to setting up the double belt system? Mine don't seem to mesh at all and it seems pointless to have two in there with the way I have done it. I get the theory behind it and I think its a good idea but I just need the top to mesh with the bottom for it to work. I have tried spacing the bottom up a little with a 2mm thick double sided tape, that made the belts mesh slightly better but it can still stretch and overcome the mesh.

    Next step is to replace with GT3-3mm pitch belt but I would rather sort this with what I have got. Any ideas???
     
  2. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    The sooner you give up on the GT2 belts the sooner your misery will end. Not saying that GT3 belts are the be-all-end-all as far as belts go but the teeth have sufficient depth to do at least a little meshing where there is veritably none on the GT2 belts.
     
  3. Matt Jones

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    Thats the road I will go down I think.

    Any opinions on single vs dual belt on the GT3?
     
  4. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    For as far as you're stretching, definitely dual belts. Finding the right amount of backer to get the belts to mesh is also extremely important.
     
  5. Matt Jones

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    Thanks for the advice... I have read in the forums with the GT3 belts you want 0.5mm backing tape?
     
  6. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    You'll need to test that. I believe around 0.45mm is best but it is a hard thickness to achieve. (Please understand that it's been a while since I looked at this.)
     
    Matt Jones likes this.

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