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Clamping forces for collets
8.6

The force Fy tends to tip the work piece out of the collet bore, when the clamping length is short (L1 <
D1). To prevent this you must increase the axial force Ft by the factor b.

L L
1 2
½ F
m n
2
a, m
1 M
x
D
2
F D
t 1
F
x

F
y
½ F
n

 2M  2 μ = 0.05¸ 0.3
βs  x  2 1
F = + F (tanα + μ )


t μ  D  x 1 for work pieces in steel :
2  1 
μ = 0.05 ¸ 0.3 with smooth bore
2
0.2¸ 0.4 with grooved bore
0.3¸ 0.6 with serrated bore
s = 1.2 ¸ 1.5

Influence of F in relation with
y
the distance to the collet L 2

12

10

8

b 6

4

2

0
0.5 1 1.5 2 2.5 3 3.5 4

L /D 1
2

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