Jointer Stones Recommendation Charts

This simple chart compares the characteristics of various jointer stone types. February 14, 2007

This article was reprinted with permission from Wood Tech Tooling, www.woodtechtooling.com.

Hard Jointing Stones

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Soft Jointing Stones

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Traditionally, Hard Jointing stones (Coarser 80 to 240 grit) are used on 3,600 rpm machines. Soft jointer stones (Finer 280 to 600 grit) are used on 6,000 rpm machines.

Grit Size:
Finer grits (higher number) produce better finish quality.
Coarse grit stones will joint up faster and have a longer life.

Bonds:
Resin - better finish, will not hold a form as long.
Vetrified - cooler cuts, better for holding qualities than Resin.

Abrasive Materials:

Green Silicon Carbide: Cuts cooler and faster than Black Silicon Carbide.
Black Silicon Carbide: Smoother finish, longer life.
Aluminum Oxide: Pure White Cuts fast and cool, best for Straight Joints on Planers.

NOTE: Grinding accuracy is critical in determining proper jointing stone selection.

This article was reprinted with permission from Wood Tech Tooling, www.woodtechtooling.com.