GENERAL INFORMATION CU800 Service Manual
17
not equal the actual torque applied to the fastener. It
is necessary to recalibrate the torque setting on the
wrench to compensate for the change of lever
length. When using a torque adapter at a right
angle to the drive head, calibration is not required,
because the effective length has not changed.
To recalculate a torque reading when using a
torque adapter, use the following formula and refer
to Figure 14:
TW = TA×L
L+A
TW is the torque setting or dial reading on the
wrench.
TA is the torque specification and the actual
amount of torque that is applied to the fastener.
A is the amount that the adapter increases (or in
some cases reduces) the effective lever length as
measured along the centerline of the torque wrench.
L is the lever length of the wrench as measured
from the center of the drive to the center of the grip.
The effective length is the sum of L and A.
Example:
TA=20 ft.-lb.
A=3in.
L=14in.
TW=20×14=280=16.5 ft. - lb.
14+3 = 17
In this example, the torque wrench would be set to the recalculated torque value (TW = 16.5 ft. –
lb.). When using a beam-type wrench, tighten the fastener until the pointer aligns with 16.5 ft. –lb. In
this example, although the torque wrench is preset to 16.5 ft. –lb., the actual torque is 20 ft. –lb.
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