Walk-behind grinders stop about 25 cm short of a drain. Finish the perimeter with an angle grinder and a diamond cup wheel, then feather the transition so there is no visible ridge.
Walk-behind grinders cannot reach within about 20-30 cm of a floor drain. Finish the perimeter with an angle grinder and a diamond cup wheel, working from the drain outward and feathering the edge so the floor does not show a hard stop line.
Use a cup wheel matched to the bond of the slab for the perimeter. A bush hammer roller on an angle grinder can texture the tight corners if the finish requires anti-slip. Work slowly — an angle grinder cuts fast and can dig a gouge in seconds.
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.
