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Cutting issues with the Workbee CNC

Discussion in 'CNC Mills/Routers' started by KCollins, Nov 21, 2021.

  1. KCollins

    KCollins Well-Known
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    Perfect Thanks Peter. I'll try making that adjustment over my lunch hour.
     
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  2. KCollins

    KCollins Well-Known
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    The bolts were tighter than they should be. This is how it sounds now. Still pretty noisy. Watch the movie.
     

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  3. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Replace the front stop collar with Tension Nut and pull the screw into tension.
    That'll pull the whip out of that slightly bent leadscrew
    While you have it apart, replace the Thrust bearing Thrust Bearing
     
  4. KCollins

    KCollins Well-Known
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    But I just replaced the thrust bearings with needle bearings. Those are brand new and making that much noise. Do I have too much tension on my screw maybe?
     
  5. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    I think the wobbly leadscrew is making the thrust bearing move side to side a little. Needle bearings, unlike the recommended Thrust bearings from out store, need more perfect axial alignment. However, the unwanted movement would wear either of them out in due course. The newer machine designs like the LEAD1515 and later revisions of the Workbee uses the Tensioned leadscrew to mitigate the whipping - its an easy upgrade.

    Minimalist example of the tension stackup:

     
  6. KCollins

    KCollins Well-Known
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    so you are saying I need to tension my lead screws more and that will help with the noise? I had tightened it after I replaced the thrust bearings but I could go tighter if you think that would help. I have the little tension knob that screws onto the end of the lead screw.
     
  7. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Do you already have tension? From the video I see a stop collar, not a tensioning nut? (Gotcha the seperate tensioning tool thingy)
    I still see a lot of whip in the leadscrew on the video - if its too bent to tension, you might need to replace the screw
     
  8. KCollins

    KCollins Well-Known
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    It came with Stop Collars. So that's what I used. I like the looks of the Tension Nuts and will probably get them. I had put "some" tension on the screw but not a ton. I could go tighter. I was worried I have too much tension and blow out my thrust bearing again. Should I go as tight as I can get?
     
  9. CNC_whittler

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    Can they be adjusted (if necessary) without dis-assembling the carriage?
     
  10. Gary Caruso

    Gary Caruso OpenBuilds Volunteer
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    That is not loud at all!! normal stepper sound
    Cutting.. now that is LOUD
     
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  11. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    I think he means the clicking noise :) - particularly because he already had a worn thrust bearing because of it
     
  12. KCollins

    KCollins Well-Known
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    bingo Peter.
     
  13. KCollins

    KCollins Well-Known
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    I'm having new issue now. The right side of the gantry is binding along the y axis. And I can't figure out why... The left side keeps moving and the right side stops and the x axis binds up. I suspect my lead screw is slipping in the coupler but for whatever reason I can't get tightened down.
     
  14. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Try lowering Acceleration and Max Rate values for Y (In Grbl Settings) just to rule out parameters - with the leadscrew nice and tensioned and the anti backlash nut set - perhaps the parameters are just a little optimistic causing the motor to stall
     
  15. KCollins

    KCollins Well-Known
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    you by chance have a video on how to do that peter? LOL...
     
  16. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    I don't but its as easy as

    OpenBuildsCONTROL > Connect > click Grbl Settings tab > scroll down to Y axis acceleration > type in a lower number. Repeat for Y axis Max Rate too. Click Save and Reset when prompted. Do another test
     

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