Schaublin_Catalogue

Page - Seite 8.6

Clamping forces for collets

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 β .

L

L

2

1

½ F

µ

n

2 α, µ

M

1

x

D

2

F

D

t

1

F

x

F

y

½ F

n

2

µ for work pieces in steel : 0.3 0.05 1 µ = = ÷

   

   

2M

2 µ β s

2

x

=

+

+

F

F

(tan α

)

1 µ

t

x

D

1

0.6 with serrated bore 0.3 0.4 with grooved bore 0.2 0.3 with smooth bore 0.05 2 ÷ ÷ ÷

1.5 1.2 s ÷ =

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

12

10

8

β

6

4

2

0

0.5 1 1.5 2 2.5 3 3.5 4

/D 1

L 2

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