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Lead Screw Lead and Positioning Accuracy

Discussion in 'CNC Mills/Routers' started by Patrick66, Oct 4, 2024.

  1. Patrick66

    Patrick66 New
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    I'm curious how much the lead of a lead screw screw affects positioning. I just noticed the lead screw i bought has a lead of 3mm. While the standard lead is 4mm. Will this affect positioning drastically? (I assume it would be off by at least 1mm, right?) If so, how do I fix it? Is there a motor that is designed for a 3mm lead? Thanks.
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Ours is 8mm :)

    3mm screw will be 3/8th the speed of ours, but also 8/3x more torque.

    Our 8mm has more than enough torque, so its not that you need more torque, so possibly just a bad tradeoff for a slower machine with "reserve" power you won't use.

    Other thing is of course compatibility with the rest of the ecosystem (nutblocks, tension nuts etc) as applicable won't fit the different thread pattern
     
  3. Patrick66

    Patrick66 New
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    Will it drastically affect accuracy in any way? +/- a whole millimeter?
     
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Will make it "more" accurate (ours was already like 0.004mm so won't be noticable) - but the slowness will be frustrating, and on some jobs a problem (not moving fast enough to create chips, endmill rubbing instead of cutting chips (or cutting dust instead of chips) causes endmill to overheat (chips pull heat from cutting edges) causing endmills to go blunt quicker, etc. Jobs will take very long too.
     
  5. Patrick66

    Patrick66 New
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    Okay. Thank you
     

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