Metal & Resin Bond Grinding Disc for Granite Slab Grinding

These discs are built for polishing-line machines, so skip them if your work is handheld, site-based, or a different holder format. For handheld grinder work on edges, cutouts and small repairs, choose a cup wheel — it mounts angle grinders, while these discs mount automatic continuous polishing machines or single head grinding machines. If your job is the final buff to gloss, that belongs to polishing discs: grinding discs stop at 3000# fine grinding, and polishing discs take the final gloss afterwards. And if your machine uses a frankfurt or fickert holder system instead of round disc heads, choose frankfurt or fickert abrasives — the holder format is different, and these discs will not fit. Buy these grinding discs when you run a disc-head polishing or grinding machine and need the grinding stages between calibration and polishing: metal discs for coarse grinding, resin discs for fine grinding. A quick way to confirm fit before ordering is to send a photo of your machine's grinding head and the abrasive you currently use; DINOSAW will verify the mounting format and recommend the correct grit sequence for your granite slabs.

Send five things: your machine model, disc diameter, the grits you need, your granite type, and your monthly consumption. The machine model — automatic continuous polishing machine or single head grinding machine — plus a photo of the grinding head confirms the mounting interface. Diameter is chosen from four standard classes: 4"/100, 5"/150, 6"/200 and 10"/250 mm, matched to your head positions. For grits, state the stage split: metal bond 50#, 10S#, 200#, 400# for coarse grinding, resin bond 500#, 800#, 1500#, 3000# for fine grinding — or both if you are setting up the full sequence from scratch. Granite hardness and abrasiveness influence bond advice and consumption estimates, so name the stone or send a sample photo. Monthly disc consumption, or the disc life you currently achieve, lets DINOSAW propose a supply plan with quantity tiers instead of quoting a single box price. Finally, include the destination country for packing and shipping planning. With these five items, the quotation comes back with the correct diameter, grit list and volume pricing rather than a generic price list.

Both disc types install on the same machines: an automatic continuous polishing machine or a single head grinding machine. On a continuous polishing line, discs are arranged across the grinding bridge in stations and the slab passes under them in one continuous flow; on a single head grinding machine, the operator processes the slab section by section. Either way, the working sequence runs metal first, resin second: 50# and 10S# metal discs level the slab and remove the saw-cut face, 200# and 400# metal discs refine the flatness, then 500#, 800#, 1500# and 3000# resin discs step the surface toward a polishable base. Each grit must erase the previous scratch depth before the next one works, so skipping grits to save discs usually costs more time at the polishing stage than it saves at grinding. Before running a new batch, check two things: that every head in a station carries the same grit, and that water reaches the grinding zone, because grinding granite without coolant overheats the bond and wastes disc life on both metal and resin discs.

Metal discs deliver high processing efficiency and long lifespan in coarse grinding; resin discs wear faster by design at the fine stage — plan the budget separately for each. In the coarse stage, the metal bond wears slowly and holds the diamond grit firmly, so 50# to 400# discs typically serve many shifts before cutting action fades; exact life depends on granite hardness, slab throughput and head pressure. Resin bonds are softer so they release worn diamond gradually and keep fresh edges cutting at 500# to 3000#, which means finer discs consume faster and should be treated as a recurring consumable line item. Track two numbers per station — slabs processed per disc and gloss after polishing — and reorder when either drifts from your baseline. If metal disc life runs short on your stone, the cause is usually excessive head pressure or insufficient water rather than the disc itself; if resin discs load up and stop cutting, check that the metal stage fully removed the coarse scratches first. Send your current consumption figures with an inquiry and DINOSAW will suggest a grit plan and diameter mix that balances disc cost against polishing-line speed.