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Problems with Wide belts

Belt rupture

possible reasons

  • Belts crinkled or injured during usage
  • Wrong belt joint or model
  • Incorrect abrasive cylinder
  • Belt tension too low
  • Belt burden too high
  • Shock use of the belt
  • Debris on the surface

Belt crinkles and wrinkles

possible reasons

  • Belt manufactured conically
  • Conical abrasive cylinder
  • Abrasive cylinder worn out
  • Belt tension too low

Belt runs from the machine

possible reasons

  • Jittering edges
  • Re-direction device defect
  • Conical abrasive cylinder
  • Belt tension too low
  • Abrasive burden too high

Belt slides off the machine

possible reasons

  • Belt tension too low
  • Material thickness differs too much
  • Not enough power for the drive cylinder
  • Worn out contact cylinder

Output insufficient

possible reasons

  • Abrasive cylinder or transport belt worn out
  • Conical abrasive cylinder
  • Insufficient dust removal
  • Usage of too fine grit
  • Abrasive not suitable for purpose
  • Incorrect storage

Variing scratches on the surface

possible reasons

  • Too much dust in the machine
  • Glazing of the sanding belt

Stripes in the finish

possible reasons

  • Contact cylinder or shoe cause stripes due to use of diffent material widths without readjusting
  • Broken or torn off grit on the belt
  • Broken surface of the contact cylinder or shoe

Markings due to contact cylinder

possible reasons

Calculation formula: A = (S * D * 3,14) / V * 60

  • A = distance between markings (mm)
  • S = feed speed (m/min)
  • D = diam. of the contact cylinder (mm)
  • L = belt lenght (mm)
  • V = belt speed (m/s)

Markings due to belt joint

possible reasons

Calculation formula: A = (S *L) / V * 60

  • A = distance between markings (mm)
  • S = feed speed (m/min)
  • D = diam. of the contact cylinder (mm)
  • L = belt lenght (mm)
  • V = belt speed (m/s)

Pinstripes

possible reasons

  • Broken grit through minerals or metals in the workpiece
  • Sanding pressure too high

Blaze trace

possible reasons

  • Glue leftovers on the surface
  • Resin parts in the wood
  • Oily or too humid wood