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long lead screw 1500+

Discussion in 'CNC Mills/Routers' started by Goofy, May 1, 2015.

  1. Goofy

    Goofy New
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    I am looking for a long screw but a little worried about whip any one had luck with a 5 to 6 foot lead
     
  2. Joe Santarsiero

    Joe Santarsiero OB addict
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    Your looking for the critical speed.
    Its based on length, end support types, and I believe minor dia.
    google "Nook critical speed"
     
    GrayUK likes this.
  3. GrayUK

    GrayUK Openbuilds Team Elder
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    Joe.
    Can y0u drop a copy of that "Nook critical speed" in to Helpful Tools section?

    Cheers
    Gray
     
  4. Joe Santarsiero

    Joe Santarsiero OB addict
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    Done
     
  5. GrayUK

    GrayUK Openbuilds Team Elder
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    Thank you
     
  6. Jonny Norris

    Jonny Norris Veteran
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    You need a ballscrew over that distance.. Leadscrews only for vertical aplications really. Im using a 1500m 20 mm ballscrew with an anti backlash nut and getting |<0.01mm backlash with it. This is a quality ballscrew, there are cheap chinese versions that wont perform anywhere near so really it depends on the quality.

    Video of one here being spun at 2000rpm with no whip:

    Hope this helps
     

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