TABLE OF CONTENTS 
Pitch of Broach Teeth. The pitch of broach teeth depends upon the depth of cut or chip thickness, length of cut, the cutting force required and power of the broaching machine. In the pitch formulas which follow
| L = | length, in inches, of layer to be removed by broaching |
| d = | depth of cut per tooth as shown by Table 1 (For internal broaches, d = depth of cut as measured on one side of broach or one-half difference in diameters of successive teeth in case of a round broach) |
| F = | a factor. (For brittle types of material, F = 3 or 4 for roughing teeth, and 6 for finishing teeth. For ductile types of material, F = 4 to 7 for roughing teeth and 8 for finishing teeth.) |
| b = | width of inches, of layer to be removed by broaching |
| P = | pressure required in tons per square inch, of an area equal to depth of cut times width of cut, in inches (Table 2) |
| T = | usable capacity, in tons, of broaching machine = 70 per cent of maximum tonnage |
| Material to be Broached | Depth of Cut per Tooth, Inch | Face Angle or Rake, Degrees | Clearance Angle, Degrees | ||
|---|---|---|---|---|---|
| Roughing [a] | Finishing | Roughing | Finishing | ||
| Steel, High Tensile Strength | 0.0015 0.002 | 0.0005 | 10 12 | 1.5 3 | 0.5-1 |
| Steel, Medium Tensile Strength | 0.0025 0.005 | 0.0005 | 14 18 | 1.5 3 | 0.5-1 |
| Cast Steel | 0.0025 0.005 | 0.0005 |
