Rohm Norm RN 1391 Informaciones Y Directivas Generales Para El Empleo De Instalaciones De Sujeción Accionadas Por Fuer página 51

Both components F
The amount of the resultant force F
will have to be determined by interpolation.
Fig. 5: Resultant force F
The resultant force FR for drilling in solid material is inserted in the familiar
formula for determining the required clamping force F
where:
F = clamping force required for a specific job with the chuck stationary
spz
F = resultant force of cutting force and feed force
R
Clamping ratio
μsp = clamping coefficient (friction between jaw and workpiece)
S = safety factor
z
Re. b) and c)
Continuation of the calculation to determine the initial clamping force F
determination of actuating force and the pressure required - exactly as de-
scribed in Turning [} 42], b) and c).
RN-1391
Reference Speed and Clamping Force Calculation |
and F produce the resultant force F
sBo vax
is given in Figure 5. Intermediate values
R
Feed force Fvax [kN]
Vorschubkraft F
kN
R
machining Ø
clamping Ø
[kN]
vax
:
spz
where
2
R
bit diameter
to
spo
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EN