The Blade Grind Slide Rule is an essential tool for knife makers who need fast, accurate estimates of hollow grind heights based on steel thickness. Designed by William R. "Bill" Herndon, this compact and durable reference tool makes planning your grind profiles both simple and precise. Whether you're working with 0.125 inch (1/8") stock or going up to 0.375 inch (3/8"), this slide rule gives you estimated grind heights in both inches and metric units (millimeters and centimeters). The reverse side features a detailed steel alloy chart, breaking down the composition of popular blade steels to help makers deepen their understanding of material performance. Constructed with a clear plastic sleeve and enamel-coated card for long-lasting use in the shop, it wipes clean easily after handling.
Whether you're dialing in a symmetrical hollow grind or brushing up on metallurgy, this slide rule belongs on your bench.
Specifications:
Length: 10 inches
Width: 3.5 inches
Material: Enamel-coated stock with clear plastic outer sleeve
Measurement Units: Inches, millimeters, centimeters
Steel Thickness Range: From 0.125 inches (1/8") to 0.375 inches (3/8")
Reverse Side: Steel alloy composition chart
Designer: William R. "Bill" Herndon
Application: Hollow grind height estimation for knife makers
