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Model No.: HNKM60710
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200mm Sintered Diamond Grinding Disc / Lap Disc (Metal Bond)
| Parameter | Value |
|---|---|
| Outer Diameter (OD) | 200 mm |
| Abrasive Type | Sintered diamond (metal bond) |
| Bond Type | Sintered metal bond (bronze/iron/cobalt based) |
| Diamond Distribution | Throughout the working layer (self-sharpening) |
| Application | Grinding, lapping, and surface preparation |
| Target Materials | Gemstones, glass, crystals, ceramics, hard stones |
This 200mm sintered diamond grinding disc (lap disc) is specifically designed for grinding, lapping, and surface finishing of gemstones, glass, and other hard, brittle materials.
Unlike electroplated discs where diamond is only on the surface, this sintered metal bond disc has diamond grit distributed throughout the entire working layer. As the disc wears, fresh diamond is continuously exposed – providing consistent cutting performance and extended service life.
Typical applications include:
✅ Gemstone faceting and shaping – quartz, topaz, sapphire, ruby
✅ Glass grinding and edge finishing – flat glass, optical glass, glass art
✅ Crystal and ceramic lapping – precision surface preparation
✅ Hard stone shaping – granite, marble, engineered stone
| Feature | Benefit |
|---|---|
| 200mm diameter | Large working surface – efficient for multiple parts |
| Sintered metal bond | Long life – diamond throughout the working layer |
| Self-sharpening | Fresh diamond exposed as disc wears – consistent cutting |
| Versatile | Works on gemstones, glass, ceramics, and hard stones |
| Cool grinding | Good heat dissipation – prevents thermal damage |
| Dressable | Can be dressed to refresh the surface when needed |
| Feature | Sintered Diamond (This) | Electroplated Diamond | Brazed Diamond |
|---|---|---|---|
| Diamond distribution | Throughout working layer | Single layer | Single layer |
| Self-sharpening | ✅ Yes | ❌ No | ❌ No |
| Life | ⭐⭐⭐⭐⭐ Longest | ⭐⭐ Short | ⭐⭐⭐⭐ Long |
| Sharpness | ⭐⭐⭐ Moderate | ⭐⭐⭐⭐ Sharp | ⭐⭐⭐⭐⭐ Sharpest |
| Can be dressed? | ✅ Yes | ❌ No | ❌ No |
| Best for | Production, long life | Occasional use | Aggressive cutting |
Gemstones and glass are hard, brittle materials that require diamond abrasive for efficient grinding.
| Material | Hardness (Mohs) | Abrasive Requirement |
|---|---|---|
| Quartz (amethyst, citrine) | 7 | Diamond required |
| Topaz | 8 | Diamond required |
| Corundum (sapphire, ruby) | 9 | Diamond required |
| Glass | 5-7 | Diamond recommended |
| Crystal | 7 | Diamond required |
| Abrasive | Suitability for Gemstone/Glass | Reason |
|---|---|---|
| Sintered Diamond | ⭐⭐⭐⭐⭐ Excellent | Long life, consistent cutting |
| Electroplated Diamond | ⭐⭐⭐⭐ Good | Sharp but shorter life |
| Brazed Diamond | ⭐⭐⭐⭐⭐ Excellent | Sharp, but more expensive |
| Silicon Carbide | ⭐⭐⭐ Moderate | Not hard enough for hard stones |
| Alumina | ⭐⭐ Poor | Wears quickly |
Sintered diamond is made by mixing diamond grit with metal powder (bronze, cobalt, or iron-based) and then sintering – heating and compressing until the metal fuses around each diamond grain.
| Stage | Action |
|---|---|
| 1 | Diamond grains cut the material |
| 2 | As grains dull, the metal bond wears slightly |
| 3 | Dull grains are released |
| 4 | Fresh, sharp diamond grains are exposed |
| 5 | The disc continues cutting at consistent speed |
| Benefit | Explanation |
|---|---|
| Consistent performance | No drop-off in cutting speed as the disc wears |
| Long life | Diamond throughout the working layer – more total cutting |
| Lower cost per part | Fewer disc changes – lower cost over time |
| Parameter | Value / Range |
|---|---|
| Outer Diameter (OD) | 200 mm |
| Abrasive | Sintered diamond (metal bond) |
| Grit range | #60 – #1200 (depending on application) |
| Bond type | Sintered metal |
| Disc thickness | Custom (per customer requirement) |
| Bore / Arbor | Custom (per customer machine) |
| Application | Gemstone, glass, hard material grinding |
| Target materials | Gemstones, glass, ceramics, hard stones |
| Application | Recommended Grit |
|---|---|
| Rough shaping / stock removal | #60-120 |
| General grinding | #150-240 |
| Fine grinding / surface prep | #320-600 |
| Polishing preparation / fine lapping | #800-1200 |
| Gemstone Type | Hardness (Mohs) | Application |
|---|---|---|
| Quartz (amethyst, citrine) | 7 | Faceting, cabochon shaping |
| Topaz | 8 | Pre-forming, flat lapping |
| Corundum (sapphire, ruby) | 9 | Rough grinding, surface preparation |
| Beryl (emerald, aquamarine) | 7.5-8 | Shaping, faceting |
| Garnet | 6.5-7.5 | General grinding |
| Glass Type | Application |
|---|---|
| Optical glass | Lens blank pre-forming, edge grinding |
| Flat glass | Surface preparation, edge smoothing |
| Stained glass | Edge shaping, surface smoothing |
| Glass art | Sculpture shaping, bevel grinding |
| Crystal | Faceting, polishing prep |
| Material | Suitability |
|---|---|
| Ceramics | ⭐⭐⭐⭐⭐ Excellent |
| Hard stones (granite, marble) | ⭐⭐⭐⭐⭐ Excellent |
| Carbide | ⭐⭐⭐⭐⭐ Excellent |
| Composites | ⭐⭐⭐⭐ Good |
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