Use a medium-hard metal bond in 30/60 grit for granite edges, and a softer bond in 60/120 for marble. Always follow metal grinding with resin polishing pads to remove scratches.
Stone slab edges need a different bond than concrete: granite grinds well with a medium-hard metal bond in 30/60 grit, while marble requires a softer bond in 60/120 so it does not scratch or glaze. Follow metal grinding with resin polishing pads to bring the edge to a clean finish.
| Stone | Bond | Starting grit | Finish |
|---|---|---|---|
| Granite | Medium-hard | 30/60 | 120, then resin 200-3000 |
| Marble | Soft | 60/120 | Resin 200 onwards, polish |
| Engineered stone | Medium | 60/120 | Resin 400-1500 |
Use a metal-bond diamond cup wheel or finger segment on an angle grinder, with water to keep the stone cool and control dust. A trapezoid metal-bond disc works on slab edges and countertops held on a bench; a triple-round segment disc is useful for aggressive edge shaping on granite. Finish scratches with resin polishing pads. Never use a concrete-soft bond on granite — it glazes and stops cutting within minutes.
A: Only when the slab is already smooth and you are refining. On rough or ground-new concrete, skipping leaves a scratch pattern finer pads cannot resolve.
A: If segments glaze and stop cutting, the bond is too hard; if they wear flat in under half a set, it is too soft. Match bond to concrete hardness.
A: Dry grinding with a HEPA vacuum is standard on polished concrete jobs; wet grinding is mostly used for stone and edge work to control dust and heat.
A: Change the whole set together once segment height drops by half or the cut rate slows. Mixing new and worn plates causes uneven scratch patterns.
Choosing the right bond, grit and technique for your concrete job saves tooling cost and avoids rework. Match the tool to the slab, work in the correct grit sequence, and keep plates balanced — the floor will tell you when you are ready for the next step. Contact JOY TECH for tooling recommendations matched to your machine and concrete hardness.
