Koleksi: Flexible Diamond Expanding Belts
Flexible Diamond Expanding Belts – Drum Sanding for Stone & Glass
Flexible diamond expanding belts designed for use on rubber expanding drum wheels — the workhorse setup for lapidary cabochon grinding, stone shaping, and glass edge work. The flexible diamond-coated backing expands with the drum for a firm, even grip and consistent abrasion across the full contact surface. Available in a complete grit range from aggressive shaping through fine pre-polish.
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Available Sizes & Pricing
| Drum Size | Belt Width | Grit Options | Price (USD) |
|---|---|---|---|
| 4" diameter | 1.5" / 3" | 60 / 120 / 220 / 400 / 600 / 1,200 / 3,000 | $14–$22 |
| 6" diameter | 1.5" / 3" | 60 / 120 / 220 / 400 / 600 / 1,200 / 3,000 | $18–$28 |
| 8" diameter | 1.5" / 3" | 60 / 120 / 220 / 400 / 600 / 1,200 / 3,000 | $22–$34 |
| 10" diameter | 1.5" / 3" | 60 / 120 / 220 / 400 / 600 / 1,200 / 3,000 | $28–$42 |
| Custom sizes | Custom | All grits available | Contact us |
Grit Selection Guide
| Grit | Stage | Best For | Surface Result |
|---|---|---|---|
| 60–120 | Coarse shaping | Initial cabochon grinding, rough shaping | Shaped, rough surface |
| 220–400 | Medium sanding | Scratch removal after coarse stage | Smooth, refined texture |
| 600–1,200 | Fine sanding | Pre-polish preparation | Near-scratch-free surface |
| 3,000 | Pre-polish | Before cerium oxide or final polish | High gloss, minimal haze |
Compatible Applications
- Lapidary cabochon grinding and shaping on expanding drum machines
- Gemstone pre-form shaping and dopping preparation
- Glass edge grinding and beveling on drum setups
- Ceramic and porcelain edge and surface refinement
- Quartz, agate, jasper, and obsidian drum sanding
- Petrified wood and fossil stone shaping
- Knife handle stone inlay and scale finishing
Related Tools
- Flexible Diamond Mandrel Bands
- Sanding Accessories (Drum Wheels)
- Diamond Sanding Belts
- Resin Diamond Sanding Belts
- Cerium Oxide Resin Belts
- Diamond Hand Pads
Frequently Asked Questions
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Q: What is the difference between expanding belts and mandrel bands?
A: Both fit rubber expanding drums, but expanding belts are typically wider and designed for flat-face drum grinding, while mandrel bands are narrower and used on smaller drum mandrel setups. Check your machine’s drum width and diameter to select the correct product. -
Q: What drum sizes are flexible diamond expanding belts compatible with?
A: Available for 4", 6", 8", and 10" rubber expanding drums in 1.5" and 3" widths — the most common configurations in lapidary and stone grinding machines. Custom sizes available on request. -
Q: Should diamond expanding belts be used wet or dry?
A: Always use wet. Water cools the workpiece and drum, flushes away swarf, prevents heat damage, and significantly extends belt life. Never run diamond expanding belts dry. -
Q: What grit sequence should I use for lapidary cabochon work?
A: Start with 60 or 120 grit for shaping, then progress through 220, 400, 600, 1,200, and 3,000 grit. Finish with a cerium oxide belt or pad for a mirror result. Do not skip grit steps — each stage must remove the scratches left by the previous one. -
Q: How do I install a diamond expanding belt on a rubber drum?
A: Deflate the rubber drum, slide the belt over it, center it, then inflate the drum to expand and grip the belt firmly. The belt should be taut and wrinkle-free before starting the machine.