Arbor Discs

Arbor Discs – Arbor-Mounted Diamond Grinding Discs for Lapidary

Professional arbor-mounted diamond grinding discs for flat lap machines and lapidary grinders. Arbor discs mount directly onto the machine spindle via a central arbor hole — providing a stable, rigid grinding surface for flat grinding, faceting prep, and cabochon finishing on agate, jasper, quartz, and gemstone materials.

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Disc Specifications

Diameter Arbor Size Grit Notes
6" (150mm) 1" / 5/8" 60–3000 Standard flat lap machine size
8" (200mm) 1" / 5/8" 60–3000 Larger grinding surface for production use
10"+ (250mm+) 1" 60–1200 Production flat lap and large format grinding

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Frequently Asked Questions

  • Q: What is an arbor disc?
    A: An arbor disc is a flat lap grinding disc with a central arbor hole that mounts directly onto the machine spindle. Unlike magnetic discs, arbor discs are secured mechanically for a rigid, stable grinding surface.
  • Q: What arbor size do I need?
    A: Most lapidary flat lap machines use a 1" arbor. Some smaller machines use 5/8". Check your machine specifications and use an arbor adapter if needed.
  • Q: Can I use arbor discs on a cab machine?
    A: Arbor discs are designed for flat lap machines. They can be used on cab machine arbors with the correct adapter, but are primarily intended for flat grinding applications.
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