Granite is hard, dense, and brittle. Cutting it requires the right blade, stable support, and dust control. Always prioritize safety:
PPE: Safety glasses (ANSI Z87.1), hearing protection, cut-resistant gloves, and a P100 or N95 respirator if any dry cutting occurs.
Water management: Prefer wet cutting to reduce silica dust and keep blades cool; use a GFCI-protected outlet and control runoff.
Support & clamping: Place the slab or top on a rigid, flat surface (e.g., two layered foam boards over a plywood table). Support both sides of the cut to prevent pinching or break-off.
Lighting & scribing: Bright light, clear scribe lines (wax pencil), and painter's tape on the cut line to reduce micro-chipping.
Blade care: Use diamond blades designed for stone. Dress or true the blade if cuts start to wander or burn.
The Tools You'll Use (And Why)
Primary cutting tools
Bridge/wet table saw with stone diamond blade: Best for straight, accurate cuts on slabs, tiles, and pavers.
Angle grinder (4.5–5") with diamond blade: Ideal for field cuts, trimming, notches, and curves. Use a dust shroud + HEPA vac or a water-feed attachment.
Circular saw with water-feed + continuous-rim blade: Useful for long straight cuts when a bridge saw isn't available.
Diamond core bits (wet): For faucet/sink holes; use a drill stand or guide jig to keep perpendicular.
Oscillating multi-tool with diamond grit (optional): Cleaning corners and fine adjustments after the main cut.
Blade types
Continuous-rim diamond: Cleanest edge on polished faces; slower but minimizes chipping.
Turbo-rim: Faster stock removal, acceptable finish on hidden edges.
Segmented-rim: Aggressive cuts on thick pavers; more chipping-reserve for rough work.
Finishing tools
Diamond hand pads or flexible polishing pads (50/100/200/400/800/1500/3000 grit) with a variable-speed polisher.
Chamfer/bullnose profiling wheel (optional) for edge details.
Dressing stone for maintaining blade exposure.
Planning & Templating (Accuracy Starts Here)
Measure twice, cut once. Confirm overall dimensions, overhangs, and appliance clearances.
Template the shape. For countertops, create a template with 1:1 hardboard/cardboard or digital templating. Mark wall out-of-square, reveals, sink centerlines, and faucet hole positions.
Account for movement joints & set-out. Leave appropriate gaps at walls/backsplashes for silicone joints; mark final visible edges vs hidden edges.
Inside corners = radius, not sharp. Add a 10–12 mm (⅜–½") radius at inside corners/sink cutouts to reduce stress cracking.
Plan cut direction. For polished faces, chipping typically occurs on the exit side of the blade-so cut with the polished face up on a wet saw; if using a hand saw, score the face first and support the exit.
Straight Cuts (Slabs, Tops, Tiles)
With a wet table/bridge saw
Tape & scribe: Apply painter's tape along the cut line; mark the scribe on the tape.
Blade check: Verify blade is square to table and fence; run-out causes wander and chips.
Slow feed: Start the saw, let water flow fully, then feed steadily with both hands, maintaining consistent pressure. Don't force the blade.
Support the off-cut: As you approach the end, hold the waste piece so it doesn't break off and spall the last millimeters of the edge.
With a circular saw (water-fed)
Guide rail: Clamp a straightedge/track parallel to the scribe for a straight pass.
Shallow first pass: Score 1–2 mm to establish the kerf; then complete the cut in one or two deeper passes.
Finish & de-burr: Lightly ease the edge with a 200–400 grit pad to remove micro-chips.
With an angle grinder
Score the line: Make a shallow scoring pass on the face to minimize chipping.
Complete the cut: Tilt the grinder slightly to keep the blade's leading edge doing the work; avoid binding.
Clean the edge: Dress with 100–200 grit diamond to straighten minor wander.
Curves, Notches & S-Cuts
Relief drilling: For tight inside curves, pre-drill with a diamond core bit at the curve's center or the corners of a notch; this relieves stress and guides the blade.
Plunge cuts with a grinder: Make overlapping plunge cuts to outline the curve, then nibble waste between kerfs.
Template & trace: For repeated curves (e.g., round vanity front), create a plywood template; follow with a bearing-guided profiling wheel or careful grinder work.
Sink & Cooktop Cutouts (The High-Stress Zone)
Mark both sides: Trace the template on masking tape on the polished face; mirror the lines on the back for reference.
Drill inside corner radii: At each inside corner, wet-drill a 10–12 mm radius through-hole with a core bit; this prevents sharp-corner cracking.
Plunge from the back (optional): Many fabricators start the bulk removal from the back to reduce face chipping, leaving a thin 2–3 mm skin at the face.
Complete from the face: Flip and finish the last millimeters from the polished face with a continuous-rim blade for a clean edge.
Support the cutout: Clamp or use suction cups/crossbars to support the center piece so it doesn't drop and fracture the slab.
Edge refinement: True up the opening with an angle grinder and 50–100 grit diamond; maintain the specified radius at corners.
Undermount sinks: The exposed inside edge must be uniform, smooth, and sealed. After cutting, run the polishing sequence (see below).
Top-mount sinks: The rim covers the edge; still ease and seal the stone under the rim to prevent wicking.
Faucet & Accessory Holes
Core bit + guide: Use a water-fed diamond core bit with a drill stand or a handheld guide jig.
Start with a tilt: Begin at a slight angle to prevent skittering, then bring the drill vertical.
Low speed, light pressure: Let the diamonds cut; too much force cracks the stone. Frequently lift to let water flush the slurry.
Backer board: Place wood/foam beneath to prevent blow-out when the bit exits.
Edge Profiles, Chamfers & Polishing
Basic edge options
Eased (square with slight 1–2 mm radius)
Micro-bevel (1–3 mm 45°)
Quarter-round/half-bullnose (requires a profiling wheel or hand shaping)
Chamfered (consistent 2–5 mm chamfer hides micro chips)
Polishing sequence (typical)
Start at 50 or 100 grit to remove saw marks and establish shape.
Progress: 50 → 100 → 200 → 400 → 800 → 1500 → 3000. Keep pads wet; rinse between grits.
Maintain consistent strokes and pressure; avoid dwell marks.
Final wipe and inspect under raking light; rework any dull bands at the previous grit.
Optional: Use a stone-safe polishing compound on a felt pad for extra gloss on polished edges.
Seal the edge and any fresh cuts with an impregnating sealer once fully dry.
Wet vs Dry Cutting (When You Don't Have Water)
Wet cutting is strongly preferred for health, blade life, and finish quality.
Dry cutting is feasible for small trims with a grinder only with a dust shroud + HEPA vacuum and a P100/N95 respirator. Take frequent cool-down pauses to avoid overheating and glazing the blade.
Troubleshooting: Clean Cuts Every Time
| Problem | Likely Cause | Fix |
|---|---|---|
| Edge chipping on the face | Wrong blade (segmented), too fast feed, no scoring | Switch to continuous-rim, score first, reduce feed |
| Blade wanders off line | Worn/glazed blade, too much pressure, poor support | Dress the blade, slow feed, add support near the kerf |
| Burn marks or discoloration | Insufficient water, high RPM, glazed blade | Increase water flow, lower speed, dress blade |
| Cracked corner at sink | Sharp inside corner, unsupported cutout | Drill radius holes, support center with clamps/suction |
| Blow-out on exit | No backer, fast breakthrough | Use backer board/foam, slow on the last 2–3 mm |
| Micro-chips after saw | Aggressive blade or dry cut | Light pass with 200–400 grit, then 800–1500 polish |
Field Workflow (Quick Checklist)
Template & mark: Verify dimensions, scribe cut lines on tape.
Protect & support: Foam boards, clamps, edge guards; plan the exit path.
Blade choice: Continuous-rim for visible edges; turbo for rough cuts.
First pass: Score shallow on the face; ensure water flow if wet.
Main cut: Steady feed; support the off-cut.
Openings: Drill corner radii, relief cuts, support center sections.
Edge finish: Chamfer or ease; polish through grits.
Clean & seal: Rinse thoroughly; seal fresh cuts before installation.
When To Call A Professional
Large L-shaped tops, fragile vein patterns, or thin webs around big undermount sinks.
Complex edge profiles (full bullnose, ogee) or matched seam work across multiple slabs.
Rodding (embedding reinforcement at sink rails) or repairs on cracked sections.
High-polish restoration where uniform gloss across long runs is critical.
Fabricators have bridge saws/CNCs, vacuum lifters, digital templating, and experience managing stress points-often saving time, material, and risk.
