Updated: October 2026
Stone engraving – temple panels, name plates, memorials, jali murals and kitchen-art slabs – is the highest per-hour niche in the CNC world, and the least crowded, because it scares buyers with heavy frames and diamond tooling. The fear is overblown: a purpose-built stone CNC router with water cooling runs the same G-code discipline as wood machines, just slower and wetter. This guide covers machine spec, prices, bits, jobs and rates. All figures are estimates (est.).
How a Stone CNC Differs from a Wood CNC
| Aspect | Wood or ACP CNC | Stone CNC router |
|---|---|---|
| Frame and gantry | 800-1,200 kg class | 1,800-3,000 kg, welded and stress-relieved |
| Spindle | 3.2-6 kW, high RPM | 5.5-7.5 kW water-cooled, low-RPM torque |
| Feed drive | rack and pinion common | ballscrew or heavy rack, high thrust |
| Cooling | dust shoe and air | continuous water flood over the bit; bed drains and tank |
| Bits | carbide spirals and V-bits | sintered or electroplated diamond tools |
Machine Price Bands 2026 (est.)
| Configuration | Best for | Price (est.) |
|---|---|---|
| 9015 or 1212 stone CNC, 5.5 kW | name plates, small murals, memorials | Rs 4-5.5 lakh |
| 1325 stone CNC, 5.5-7.5 kW | temple panels, jali slabs, full murals | Rs 5.5-8 lakh |
| Heavy 1325 with z-axis 300 mm plus | deep relief and thick memorial work | Rs 7-9 lakh |
| Dual-head stone CNC | batch panel production | Rs 9-14 lakh |
Tooling and Consumables (est.)
| Item | Use | Price (est.) | Typical life |
|---|---|---|---|
| Sintered diamond flat bit, 8-10 mm | roughing marble and granite | Rs 1,200-2,500 | 40-80 working hours on granite |
| Sintered diamond ball nose | 3D relief and lettering | Rs 1,500-3,000 | 30-70 hours |
| Electroplated diamond V tool | fine lettering on marble | Rs 800-1,800 | 20-50 hours |
| Coolant water and pump wear | flood cooling loop | Rs 300-600 per month | ongoing |
Feeds, Depth and Water Discipline
- Granite: 0.5-1.5 mm depth per pass at 15-30 mm per sec; marble runs 2-3x faster. Patience is the spec.
- Water flood must cover the cut continuously – dry diamond tooling on granite dies in minutes.
- Sludge: settle and drain the bed tank weekly; stone paste destroys screws and rails if it cakes.
- Electrical safety: water plus machine means earthed circuits, drip loops on cables and a bone-dry control cabinet.
Products and Billing Rates (est.)
| Product | Typical billing |
|---|---|
| House name plates, marble or granite | Rs 1,500-8,000 each |
| Temple and wall relief panels | Rs 400-1,200 per sqft |
| Memorial and portrait engraving | Rs 5,000-25,000 each |
| Kitchen-art and inlay slabs | Rs 600-1,500 per sqft |
Payback on a Rs 6 lakh stone CNC at 3-4 hours of daily spindle time: 10-16 months (est.), faster where temple construction and premium housing are active.
Our Verdict
Buy stone CNC only for stone – it does wood slowly and ACP never. But where temple trusts, builders and memorial shops exist within 100 km, it is the least price-shopped machine in this entire guide series. Pair it with a wood-line CNC for mixed work later, see machine staging inside the Rs 1.75 Cr exhibition stall unit case study, and plan the investment with the all-India printing business startup guide.
FAQs – Stone CNC Router Guide: Marble Granite Engraving 2026
What is the price of a stone CNC router machine in India?
A genuine stone CNC router with a heavy welded frame and 5.5-7.5 kW water-cooled spindle costs Rs 4-8 lakh for 1212-1325 beds in 2026 (est.). Beware light wood-CNC frames sold as stone machines – they vibrate and lose accuracy within months on granite.
Can a regular CNC router engrave marble or granite?
Not for production. Wood-class frames lack the mass and thrust, and carbide bits cannot touch granite. Occasional soft-marble scratching is possible, but diamond tooling, water flood and a heavy frame are what make stone a business.
How long do diamond bits last on granite?
Sintered diamond bits typically deliver 40-80 working hours on granite with proper water cooling (est.). Running dry or forcing feed depth cuts life to a tenth of that.
Is stone CNC engraving a profitable business?
Yes – relief panels, memorials and name plates bill Rs 400-1,200 per sqft equivalent (est.) with limited competition outside big cities. The work is slow but the rates and margins per spindle hour are the highest in CNC.
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