Colchester student cross slide backlash

  1. Mashmoreuk New Member

    Messages:
    6
    Location:
    Berkshire
    thanks for the replies..

    I will lock the cross slide and try again, then that obviously rules out the screw/nut/backlash etc
     
    slim_boy_fat likes this.
  2. Pete.

    Pete. Member

    Messages:
    8,650
    Location:
    Kent, UK
    It doesn't I'm afraid, but it might help. The slideways wear at the ends where dirt gets under the leading edge. creating a gap. Obviously if the ends are worn it causes a crown in the middle. Under heavy load it causes the slide to rock forwards which is a favourite cause of parting-off chatter.

    Check out the first pic here for a typical example.
     
  3. Mashmoreuk New Member

    Messages:
    6
    Location:
    Berkshire
    now you say that, parting off seems to sometimes shake the machine, and make a pretty violent noise...
     
  4. Mashmoreuk New Member

    Messages:
    6
    Location:
    Berkshire
  5. Mashmoreuk New Member

    Messages:
    6
    Location:
    Berkshire
    or this

    [​IMG]
     
  6. Pete.

    Pete. Member

    Messages:
    8,650
    Location:
    Kent, UK
    It does, but not in the way you intend. Ok your cross slide nut is quite worn but look at the video again and ingore the front-back movement, look at the side to side movement you're getting. Try to adjust that movement out. If the slide goes loose and tight along it's travel then your slides are worn.
     
  7. Pete.

    Pete. Member

    Messages:
    8,650
    Location:
    Kent, UK
    Actually looking at the video you can see the wear. It's not terrible but it does need attention. There's a ridge on the left (circled in black) where it's worn the face of the way down, the red-circled bit is rust on the way because the slide is no longer running on the cast iron way but the steel (or harder iron) gib to the right, which has a shiny surface.

    slidewear.JPG
     
    eLuSiVeMiTe likes this.
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