LaymarCrafts Woodturning Information

 

Forstner Bit Cutting Speeds

Forstner Bit's and other Large Hole Cutting Bit's when used in Wood should not be Run at too higher speed, the Table below gives the recommended speeds for use in Hardwood.

 

Diameter of Bit
mm

Diameter of Bit
inches

Lathe Speed  min-1

25 1 500
30 1

450

35 13/8 400
40 1 350
45 1 300
50 2 250
55 2 240
60 23/8 230
65 2 210
70 2 190
75 3 175
80 3 160
85 33/8 145
90 3 130
95 3 115
100 4 100

These are only the recommended speeds to use, if you have a typical 4 or 5 speed Lathe you will not be able to match every increment, where as with a Variable Speed Lathe you will have the ability to do so. I would always use the nearest Lowest Speed of the Lathe applicable to the Size of Bit above.

I have this small chart Laminated and fixed to the wall by the Lathe for easy reference.



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Last update 16 July 2007
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