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Gear Rack or Ball Screws?

Discussion in 'General Talk' started by Josh Mascote, Aug 4, 2014.

  1. Josh Mascote

    Josh Mascote Journeyman
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  2. Tweakie

    Tweakie OpenBuilds Team
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    It's all bit of a trade-off between one parameter and another. My preference is for ball-screws but, dependant on screw pitch, axis rapid travel can be quite slow if driving with stepper motors on a large machine.

    Just as an example; my ball-screw pitch is 5mm and they are direct driven with stepper motors - my maximum 100% reliable rapids are 4,500mm/min which equates to 900 rpm from the steppers. This is just fine for my machine table size but it would perhaps not suite a machine with a table size of 2,500mm x 1,250mm where rack and pinion systems are often employed.

    Tweakie.
     
  3. Josh Mascote

    Josh Mascote Journeyman
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    Hmm....interesting. I was planning on making my machine 1500mm x 750mm perhaps it wouldn't be too bad.
     

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