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Lead screw delrin nut blocks

Discussion in 'General Talk' started by Anthony Bolgar, Jun 20, 2018.

  1. Anthony Bolgar

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    I am having an issue with some openbuilds lead screw anti-backlash nut blocks. They are so tight on the lead screw I can not turn them with nema17 stepper motors. Any ideas how I can fix this?
     
  2. Gary Caruso

    Gary Caruso OpenBuilds Team
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    Hi Anthony, Is this with the tension screw completely loose? Is this with it bolted in place? Sometimes the two bolts holding it in place to the plate can be too tight.
    Is the lead-screw also from openbuilds? There are some differences among manufactures of the screws, not all compatible.
    Gary
     
    MaryD likes this.
  3. Anthony Bolgar

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    Yup screws are loose, same when unbolted or bolted. But not openbuilds lead screw.
     
  4. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Can you check the diameter of the lead screw to see if they got an out of spec lot? Openbuilds screws run 7.76 to 7.80mm whereas most commercially available screws run 7.97 to 8.0mm.
     
  5. Gary Caruso

    Gary Caruso OpenBuilds Team
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    That's why, unfortunately many slight differences between suppliers.
    Cheers
    Gary
     
  6. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    *Openbuilds screws are intentionally rolled smaller to eliminate the need for sanding in order to get 8mm bearings mounted on the ends.
     
  7. Anthony Bolgar

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    Will check them out. Thanks for the info guys!
     
  8. Kevon Ritter

    Kevon Ritter Master
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    Put the lead screw in a drill and give it some alone time with some sand paper.
     
    Anthony Bolgar likes this.
  9. Giarc

    Giarc Master
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    Or, if you have extra, make a tap out of a short length and clean out the nut threads. You could probably even just use the end of an axis since the nuts never reach the end when mounted.
     
    GrayUK likes this.
  10. Anthony Bolgar

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    I put the block on the screw, chucked it in a drill an ran it at high speed up and down about a hundred times. It is now moving smoothly.
     

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