Diamond Sanding & Abrasives – Expanding Drum Belts, Sheets & Accessories

Professional diamond sanding and abrasive tools for precise material removal, edge finishing, and surface preparation in lapidary, glass, and metal applications. Our range includes expanding drum belts, flexible diamond belts, sanding sheets, and abrasive accessories for every stage of sanding work.

Related Tools

• Expandable Drum Wheels — rubber drums for mounting sanding belts on lapidary grinders
• Silicon Carbide Expanding Belts — economical abrasive belts for wet/dry stone sanding
• Flexible Diamond Sanding Belts — dot and arrow pattern belts for belt sanders and combination machines
• Resin Diamond Sanding Belts — smooth resin bond for pre-polishing on cabbing machine drums
• Diamond Smoothing Pads — precision scratch-free pre-polishing after sanding
• Diamond Hand Polishing Pads — flexible hand pads for edge finishing and spot polishing
• Flexible Diamond Sheets — sandpaper-format sheets for hand sanding and tight areas
• Diamond Grinding Wheels — rough shaping before sanding stages
• Diamond Polishing Pads & Compounds — final mirror finish after sanding
• Lapidary Machines — cabbing machines and combination units for belt sanding

Frequently Asked Questions

• Q: What are expanding drum belts used for in lapidary?
  A: Expanding drum belts are the standard sanding method for lapidary bench grinders — the rubber drum expands when spinning to grip the belt firmly, providing consistent sanding pressure on gemstones and stones. Available in 6", 8", and 10" diameters in grits from 60 to 3000+.
• Q: What is the difference between silicon carbide expanding belts and diamond sanding belts?
  A: Silicon carbide belts are economical abrasives suited for general stone sanding and softer materials. Diamond sanding belts last significantly longer, cut faster on hard gemstones (quartz, agate, jasper), and maintain consistent grit throughout their life — making them more cost-effective for serious lapidary work.
• Q: What is the difference between flexible diamond belts and resin diamond sanding belts?
  A: Flexible diamond belts use a dot or arrow pattern bond on a flexible backing — ideal for belt sanders and combination lapidary machines where the belt runs over a flat platen. Resin diamond sanding belts have a continuous resin bond for smoother, finer finishing on cabbing machine drums.
• Q: What grit sanding belt should I start with for a rough-cut gemstone slab?
  A: Start with 60–80 grit to remove saw marks and establish the basic shape. Progress through 120–220 grit for smoothing, then 400–600 grit for pre-polish preparation. Follow with 1200–3000 grit before moving to polishing pads or compounds.
• Q: Can I use diamond sanding belts on glass?
  A: Yes — flexible diamond sanding belts work well for glass edge grinding and surface preparation. Use with water cooling and start at 220–400 grit to avoid chipping. For final glass polishing, switch to cerium oxide lapping film or polishing pads.
• Q: What backing pads do I need for diamond sanding sheets?
  A: PSA backing plates or rubber backing pads secure diamond sanding sheets and discs to flat lap machines or hand-held tools. Choose the backing size (6"–12") to match your machine’s disc holder or the sanding sheet size you’re using.