Sanding +/- .001" Diameter Tolerance with an Amazon Benchtop Beltsander

How do you hold +/-.001 tolerance on diameter with an $85 Chinese belt sander... I'll show you.

Pivot tube raw wrapped layup cut to rough dimensions with plenty to spare.
Cut excess carbon composite from pivot tube

Cut excess carbon composite from pivot tube

New diameter sanding jig designed to sit on the platform of the belt sander.
Sanding fixture for pivot tube

Bottom corners of the jig brought into contact with the belt platform, slowly rotating the pivot tube, lean the part into the belt.
Holding fixture against belt sander

Slowly working to rest the fixture flat against the belt bed rotating the part constantly. I also flipped the part over to even out any taper side-to-side.
Holding fixture against belt sander

Held +/- .001" on diameter: including taper. No shit.
Measuring composite pivot tubes with dial micrometer

  • 14mm pivot tube OD (held .890 +/- .001)
    • Non-drive side 
      • .889
      • .889
      • .889
      • .889
    • Drive side 
      • .890
      • .890
      • .890
      • .891
    • Middle
      • .889
      • .889
      • .889
      • .889
  • 10mm pivot tube OD (held .774 +/- .001)
    • Non-drive side
      • .774
      • .773
      • .774
      • .774
    • Drive side
      • .775
      • .774
      • .774
      • .773
    • Middle
      • .774
      • .774
      • .774
      • .774

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