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:: Useful Information: Calculating Knife Marks Per Inch
 
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R.P.M. x No. Knives
 = Knife Marks per Inch
Ft. per Min. x 12
Wood Knife Marks per Inch
Ash

11 to 14
Basswoood

8 to 12
Beech

12 to 14
Birch (plain)

12 to 14
Birch (curly)

13 to 16
Cedar

8 to 12
Cherry

12 to 14
Cottonwood

8 to 12
Cypress

8 to 12
Elm (hard)

10 to 13
Elm (soft)

8 to 12
Fir

8 to 12
Gum

9 to 13
Hemlock

8 to 12
Hickory

12 to 15
Mahogany (plain)

12 to 14
Mahogany (figured)

14 to 16
Maple

12 to 14
Oak

12 to 14
Pine (yellow)

9 to 13
Pine (white)

9 to 13
Poplar

9 to 13
Redwood

8 to 12
Spruce

8 to 12
Sycamore

11 to 14
Walnut

12 to 14
 
 

 
 
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