How to Cut Thick Granite Letters: Waterjet vs. Vertical CNC Wire Saw

The demand for bold, 3D granite letters and heavy architectural signage is booming. Commercial clients and high-end memorial parks increasingly prefer massive, thick stone typography over flimsy metal or plastic signs. However, fabricating these thick, complex shapes presents a major technical hurdle for stone shops.

Standard bridge saws simply cannot cut the tight inside curves required for typography. This usually leaves fabricators debating between two high-end technologies: waterjet stone cutting and the vertical CNC wire saw. While waterjets are famous for their precision, are they truly the best choice for cutting thick granite? Let’s uncover the reality.

Fabricating thick 3D stone lettering requires specialized CNC equipment.

The Reality of Waterjet Cutting for Thick Granite

Waterjet cutting is incredible for 20mm to 30mm stone slabs, intricate inlays, and thin marble mosaics. But when you ask a waterjet to cut through 100mm, 150mm, or even 200mm thick igneous rock like granite, its limitations quickly become expensive liabilities.

• The Dreaded “V-Shape” Kerf Taper: This is the biggest dealbreaker for 3D stone lettering. As the high-pressure water and abrasive garnet sand travel deep into thick stone, the stream loses kinetic energy and spreads out. The result? Your letter is perfectly sized at the top, but wider and flared out at the bottom. This V-shaped taper ruins the 90-degree vertical edge required for professional architectural letters.
• Agonizingly Slow Speeds: To minimize the taper effect on thick stone, the waterjet must slow down to a crawl. Cutting a complex letter out of 150mm granite on a waterjet can take hours.
• Sky-High Consumable Costs: Waterjets consume massive amounts of expensive abrasive garnet sand per minute. When the machine has to run for hours just to cut one thick letter, your profit margins are literally washed down the drain.

The Reality of Waterjet Cutting for Thick Granite.

Why a Vertical CNC Stone Wire Saw is the Ultimate Solution

If your shop frequently processes custom monuments, headstones, and thick 3D letters, a vertical CNC wire saw is the ultimate weapon. Unlike a water stream, a diamond wire is a physical cutting tool held under high tension.

• Absolute 90° Vertical Cuts: Because the diamond wire is tensioned between two guide wheels, it does not deflect or spread. Whether you are cutting 50mm or 500mm thick granite, the cut edge remains absolutely straight and perpendicular from top to bottom. No taper, no V-shape.
• Sharp Inside Corners: Modern vertical wire saws utilize ultra-fine diamond wires (as thin as 4mm). Combined with multi-axis CNC interpolation, the machine can pivot tightly within the cut, creating the razor-sharp inside corners necessary for complex serif fonts and custom typography.
• High-Speed on Thick Blocks: Diamond wire technology was originally invented in quarries to slice mountains. It thrives on thick materials. A wire saw will chew through 200mm thick granite significantly faster than a waterjet, drastically increasing your daily output.

Why a Vertical CNC Stone Wire Saw is the Ultimate Solution.

Head-to-Head Comparison: Thick Stone Profiling

Conclusion & The Best Machine for Your Shop

If your business focuses on thin countertops or flat floor medallions, a waterjet is a fantastic investment. However, if your profit centers around monuments, headstones, and thick commercial stone lettering, relying on a waterjet will bottleneck your production and inflate your costs.

A vertical CNC wire saw eliminates edge taper, cuts faster, and utilizes a much more cost-effective consumable. It allows you to say “Yes” to the thickest, most complex custom stone projects without hesitation.