Diamond Band Saw Blade: Fit, Blade Material, and Cut Quality
You need to cut stone, glass, ceramic, or other hard, abrasive materials and you are looking for a diamond band saw blade. Diamond blades are different from bi-metal blades and they work differently. You need to know the types, what to look for, and how to choose the right one for your saw and material.
A diamond band saw blade has industrial diamond particles embedded in the cutting edge. The diamonds grind through hard, abrasive materials that would quickly destroy a bi-metal blade. Diamond blades are used for cutting stone, glass, ceramic, tile, and composite materials.
Types of Diamond Band Saw Blades
Continuous Rim
Description: A smooth, continuous rim with diamond particles embedded along the entire edge. Best for: Glass, ceramic, tile, and materials that need a clean, chip-free cut. Cut quality: Smoothest cut. Minimal chipping. Cutting speed: Slower than segmented blades. Coolant: Required. Water coolant prevents overheating and extends blade life.
Segmented
Description: Segmented rim with gaps between segments. Diamond particles on each segment. Best for: Stone, concrete, masonry, and materials where cutting speed is more important than surface finish. Cut quality: Acceptable. May chip on brittle materials. Cutting speed: Faster than continuous rim. Coolant: Recommended but can run dry for short periods.
Gulleted (Turbo)
Description: Continuous rim with gullets or turbo segments. A hybrid between continuous and segmented. Best for: General-purpose cutting of stone and ceramic. Good balance of speed and finish. Cut quality: Good. Less chipping than segmented. Cutting speed: Faster than continuous rim, slower than segmented. Coolant: Required for best results.
Blade Specifications
Diamond Grit Size
The diamond grit size affects cut quality and speed.
| Grit Size | Best For | Cut Quality |
|---|---|---|
| Fine (80 to 120 mesh) | Glass, ceramic, fine work | Smoothest |
| Medium (40 to 80 mesh) | General stone, tile | Good |
| Coarse (20 to 40 mesh) | Aggressive cutting, thick stone | Rough |
Rule: Finer grit produces smoother cuts but cuts slower. Coarser grit cuts faster but produces rougher cuts.
Diamond Concentration
Higher concentration means more diamonds in the cutting edge. More diamonds last longer but cut slower. Lower concentration cuts faster but wears faster.
Bond Type
The bond holds the diamonds in place. As the blade wears, the bond releases worn diamonds and exposes new ones.
Soft bond: For hard, dense materials like glass and hard ceramic. The soft bond wears away to expose new diamonds. Hard bond: For soft, abrasive materials like sandstone and concrete. The hard bond holds the diamonds longer because the material wears the bond slowly.
Rule: Match the bond hardness to the material hardness. Hard material, soft bond. Soft material, hard bond.
Blade Fit and Compatibility
Blade Length
Diamond band saw blades come in specific lengths to fit specific saws. Check your saw’s blade length before ordering.
Common lengths:
- 93-1/2 inches (14-inch woodworking saws)
- 80 inches (12-inch saws)
- 62 inches (10-inch saws)
- 59-1/2 inches (9-inch saws)
- Custom lengths for lapidary and specialty saws
Blade Width
Diamond blades are typically narrower than bi-metal blades.
Common widths: 1/4 to 1/2 inch.
Note: Check that your saw can accommodate the blade width and that the blade guides can be adjusted for the narrower blade.
Blade Thickness
Diamond blades are typically thinner than bi-metal blades.
Common thickness: 0.015 to 0.025 inches.
Note: Thinner blades produce less waste and cut faster but may break more easily.
Speed Requirements
Diamond blades run at slower speeds than wood-cutting blades.
Recommended speed: 500 to 3000 FPM for most diamond blades.
Note: Most woodworking band saws run at 2500 to 3500 FPM, which is at the upper end of the diamond blade range. For best blade life, use a saw with variable speed and run at the lower end.
Cutting Applications
Glass
Blade: Continuous rim, fine grit (80 to 120 mesh), soft bond. Coolant: Water, continuous flow. Speed: 500 to 1500 FPM. Feed rate: Very slow. Let the blade grind through. Forcing causes chipping. Cut quality: Smooth, chip-free if done correctly.
Ceramic and Tile
Blade: Continuous rim or gulleted, medium to fine grit (40 to 80 mesh), soft to medium bond. Coolant: Water, continuous flow. Speed: 1000 to 2500 FPM. Feed rate: Slow and steady. Cut quality: Good with minimal chipping.
Stone (Granite, Marble)
Blade: Segmented or gulleted, medium grit (40 to 80 mesh), medium bond. Coolant: Water, continuous flow. Speed: 1500 to 3000 FPM. Feed rate: Slow. Do not force. Cut quality: Good. Some surface roughness on cut edges.
Concrete and Masonry
Blade: Segmented, coarse grit (20 to 40 mesh), hard bond. Coolant: Water recommended but can run dry for short periods. Speed: 2000 to 3000 FPM. Feed rate: Moderate. Cut quality: Acceptable. Rough surface on cut edges.
Composite Materials
Blade: Continuous rim or gulleted, medium grit, medium bond. Coolant: Water if the material allows it. Speed: 1000 to 2500 FPM. Feed rate: Slow and steady. Cut quality: Good.
Coolant System
A coolant system is essential for diamond blade cutting. Water coolant:
- Prevents the blade from overheating
- Extends blade life
- Improves cut quality
- Clears slurry from the cut
Types of coolant systems:
- Built-in (on some lapidary and specialty saws)
- Add-on drip system (a container of water with a drip valve above the cut)
- Spray bottle (manual, for occasional use)
- Submersible pump in a tub (for continuous flow)
Blade Life
Diamond blade life depends on the material, blade quality, and cutting technique.
| Material | Expected Life |
|---|---|
| Glass | 20 to 50 hours |
| Ceramic and tile | 30 to 80 hours |
| Stone (granite, marble) | 20 to 60 hours |
| Concrete and masonry | 10 to 40 hours |
Tips to extend blade life:
- Use coolant continuously
- Do not force the cut
- Match the blade to the material
- Run at the recommended speed
- Dress the blade periodically (cut a dressing stone to expose fresh diamonds)
FAQ
What is a diamond band saw blade?
A band saw blade with industrial diamond particles embedded in the cutting edge. It grinds through hard, abrasive materials like stone, glass, and ceramic that would destroy a bi-metal blade.
What can I cut with a diamond band saw blade?
Stone (granite, marble, sandstone), glass, ceramic, tile, concrete, masonry, and composite materials.
Do I need coolant when using a diamond blade?
Yes, for most materials. Water coolant prevents overheating, extends blade life, and improves cut quality. Some segmented blades can run dry for short periods on concrete and masonry.
What speed should I run my diamond blade at?
500 to 3000 FPM for most diamond blades. For best blade life, run at the lower end of the range. Most woodworking band saws run at 2500 to 3500 FPM, which is at the upper end.
How long does a diamond band saw blade last?
20 to 80 hours depending on the material, blade quality, and cutting technique. Glass and hard stone wear blades faster. Ceramic and tile are easier on blades.
Can I use a diamond blade on any band saw?
Only if the saw can accommodate the blade length, width, and thickness. The saw should also be able to run at the recommended speed for diamond cutting. A variable speed saw is best.
References
- MK Morse. “Diamond Band Saw Blade Guide.” MK Morse Company.
- LENOX Tools. “Diamond Blade Specifications.” LENOX Industrial Division.
- Olson Saw. “Diamond Band Saw Blade Selection.” Olson Saw Company.
- Lapidary Journal. “Diamond Blade Cutting Guide.” Lapidary Journal.
- Granite City Tool. “Stone Cutting with Diamond Blades.” Granite City Tool.
