Expanding Drum Belts

Expanding Drum Belts – Lapidary Sanding Belts for Expanding Drums

Professional sanding belts for lapidary expanding drum attachments on cab machines. Expanding drum belts mount on a rubber expanding drum fitted to the cab machine arbor — providing a versatile sanding surface for cabochon shaping, pre-polish sanding, and surface finishing as an alternative to standard grinding wheels.

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Belt Specifications

Size Abrasive Grit Notes
6" x 2.5" Silicon Carbide 100–600 Standard lapidary expanding drum size
6" x 2.5" Diamond-Coated 120–3000 Long life, consistent cut on hard stone
8" x 3" Silicon Carbide / Diamond 100–1200 Larger drum for 8" cab machines

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Frequently Asked Questions

  • Q: What is an expanding drum belt?
    A: An expanding drum belt is a sanding belt that mounts on a rubber expanding drum attached to a cab machine arbor. When the machine runs, the drum expands slightly to grip the belt securely, providing a firm sanding surface for cabochon work.
  • Q: What size expanding drum belt do I need?
    A: The most common lapidary size is 6" x 2.5" for standard 6" cab machines. Check your expanding drum dimensions before ordering — belt width must match drum width exactly.
  • Q: Can I use expanding drum belts wet?
    A: Yes — wet use with water coolant is recommended. It extends belt life, reduces heat on the stone, and produces a better surface finish. Ensure your expanding drum is rated for wet use.
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