Engine Turning / Jeweling
The fastest way to make a blade uniquely yours.
Engine turning — also called jeweling or damascening — is a decorative finishing technique that creates a repeating pattern of overlapping circles on a metal surface. It's been used on firearms, watches, and industrial machinery for centuries, and it's become an increasingly popular way for knife makers to add a distinctive visual element to their blades.
The process is straightforward: a Cratex rod mounted in a drill press is lowered onto the blade surface for a brief moment, creating a single circular "jewel." The blade is then indexed slightly and the process repeats, building a pattern of overlapping circles across the surface.
The result is a blade that catches light differently depending on the angle — each circle reflects in a slightly different direction, creating a shimmering, textured appearance that's both functional (it can help mask minor scratches during use) and beautiful.
What You Need
- Cratex rods — centerless abrasive rods designed specifically for engine turning
- Drill press — needs a quill that moves smoothly with consistent, light pressure
- Indexing fixture — holds the blade and advances it a set distance between each jewel
- Patience and consistency — the beauty of engine turning comes from uniformity
The Process
- Mount the Cratex rod in the drill press chuck
- Secure the blade in your indexing fixture beneath the press
- Lower the spinning rod onto the blade surface for 1-2 seconds
- Lift the rod and advance the blade to the next position
- Repeat, overlapping each circle by approximately 50%
Pro Tips
- Practice first on scrap steel the same alloy as your blade
- Consistent pressure matters more than perfect alignment
- Work on flat surfaces — blade flats, bolsters, and spine
- Keep the rod clean with a brass brush
- Extra Fine creates subtle, refined patterns; Medium creates more pronounced texture
Engine Turning for Jewelry
The name says it all — "jeweling" originated in watchmaking and fine jewelry before knife makers adopted it. The same technique works beautifully on:
- Watch cases and backs — the classic application
- Silver and gold surfaces — pendants, money clips, cigarette cases
- Flat jewelry components — any broad, flat precious metal surface
The technique is identical to knife jeweling. Precious metals are softer, so use lighter pressure and Extra Fine rods for a more subtle, refined pattern.