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Broach list

Features & key points of broaches
  Calculation of resistance of broaches' cutting

F = L x ∆R x C F = Cutting resistance
Round broach L
    = N x π x D		 N = 
   Times of simultaneous cutting
Keyway broach L
   = N x W		 S =
   Number of internal serration
Serration broach L
   = N x S x W		 D = Diameter
W = Width of cutting
π = 3.14156 ∆R = Radius cutting amount
C = coefficient  (as the table on the right)

Unit:mm
0.02 0.04 0.06 0.08 0.1 0.15

High-tensile steel

460

370

330

300

280

 

Medium-tensile steel

370

280

250

230

220

200

Cast steel

 

240

210

190

180

160

Cast steel

 

190

170

160

150

140

Copper

 

 

150

130

120

110

Aluminum

 

 

130

110

100

90

 

 

  Elements for making special broaches.

 Cut object  Inner Dia. Broach  Horizontal Broach
Precision of 
     finished product's size.		 Operative stroke  Effective stroke
Material of cutting Max. force of broaching Max. broaching force,
     distance of screw bore.
Length of cutting Front handle type Distance of screw bore on table.

The size of punching bore 
     before broaching

 Real handle type