Table of contents
3QLCLM
Edition: 04/2014
24
5.4 Gripping force calculation
Calculation of the dynamic gripping force and the actual loss of gripping force
ΔF
Sp
following formula is applicable for Type 3 QLCKT:
whereby the available static gripping force Fspo (at spindle speed n = 0) is:
and the loss of gripping force A Fsp due to the jaws:
and the influence of the lever-actuated counterbalancing weights:
The dynamic gripping force F
sp:
is thus
The total centrifugal moment can be calculated as:
Terms used in the formulas:
Fsp = Dynamic gripping force [daN], the total dynamic
gripping force applied by the jaws
C1, C2, C3, C4 = chuck constants
Fax = Max. actuating force [daN]
n = Spindle speed [min
-1
]
Ma = Total centrifugal moment of the jaws [kgm]
Dsp = Gripping diameter [mm]
Y
AB
= Distance of center of gravity of top jaw from
gripping diameter [ mm]
a = Jaw overhang [mm]
i = Number of jaws
G = Mass of each jaw [ kg]
Ra = Distance of center of gravity of jaw from center of
chuck [mm]
