Problems with wide belts

Problem 1: 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

Problem 2: Belt crinkles and wrinkles

possible reasons

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

Problem 3: Belt runs from the machine

possible reasons

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

Problem 4: 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

Problem 5: 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

Problem 6: Variing scratches on the surface

possible reasons

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

Problem 7: 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

Problem 8: Markings due to contact cylinder

possible reasons

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

Problem 9: 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)

Problem 10: Pinstripes

possible reasons

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

Problem 11: Blaze trace

possible reasons

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