Forstner Cutters

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Forstner Cutters are extremely rigid hole cutters. They allow large holes to be cut in wood and, because of their large diameter stiff shanks, they can be used to cut intersecting holes without the cutter wandering.

The hackspace has a Forstner cutter set . Dia= 6, 10, 12, 16, 20, 22, 25, 28, 32, 35, 38, 41, 45, 48, 51, 54mm

It is very important that you run the cutter at the correct speed for the type of wood and diameter of the cutter. Running a cutter at too high a speed can overheat the cutter which will irreparably damage the tool.

Forstner Tool Speeds
Cutter Diameter Hard Woods (Ash, Cherry, Maple, Oak, Walnut and similar woods) Soft Woods (Cedar, Fir, Pine and similar woods)
Imperial Metric Hard Wood Max Spindle Speed Soft Wood Max Spindle Speed
1/4" - 5/8" 6mm - 16mm 1800 RPM 2400 RPM
11/16" to 1" 17mm - 25mm 1400 RPM 1800 RPM
1 1/16" - 1 7/16" 26mm - 36mm 900 RPM 1200 RPM
1 1/2" to 3" 38mm - 75mm 450 RPM 600 RPM