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Abrasives and belt grinding in a working knife shop

Abrasives

Grinding and Sharpening CPM CruWear: Belt Recommendations & Technique

Belt recommendations, grit progression, and sharpening tips for grinding CPM CruWear on a 2x72 belt grinder. Free guide from Torus CNC's ForgeBrain.

1 min readWritten by Rich LinvilleFree to read

CPM CruWear sits in the moderately demanding range for grinding, tougher on belts than simple carbon steels but generally easier than the hardest-edged tool steels like CPM M4 or D2. Its carbide structure, tungsten and vanadium in a fine powder-metallurgy grain, gives it a good balance of wear resistance without being as belt-hungry as harder-edged alternatives.

Two unfinished knife blanks on felt pads, one rough-ground and one with a clean, finely finished flat bevel

Belt Selection

Ceramic belts remain the recommended choice for stock removal. CPM CruWear does not chew through belts as fast as CPM M4 or D2, but expect more wear than with a tougher, leaner steel like CPM 3V.

Brown abrasive belt hanging in a loop over a wooden wall peg above a dark shop bench, splice visible

Grit Progression

StageGrit
Profiling / heavy stock removal50
Bevel refinement60
Pre-finish80
Finish grinding120

Technique

Run moderate to high belt speed with light, controlled passes and keep a belt eraser handy to dress the belt as it loads. A coolant mister helps preserve the temper and extends belt life during heavier profiling passes.

Brass coolant nozzle on a clamped bracket beside a steel work rest holding a cold knife blank, grinder belt stopped

Sharpening

CPM CruWear benefits from diamond or CBN abrasives for the most efficient sharpening, though it is somewhat more forgiving of standard aluminum oxide stones than harder-edged steels like CPM M4. A coarse-to-fine progression works well for reprofiling or restoring a damaged edge.

Hands drawing a knife blade across a wet diamond sharpening plate seated in a dark holder on a shop bench

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