6
・
Relationship between Torque and Torque Scale.
*Reference Value
Adjust the bit torque by changing the driving-in length of the torque adjustment ring at the end.
The relationship between torque scale and torque is as shown right, in the torque diagram. The
figures of torque scale do not in dictate bit torque values. However, the clamping torque of screw
itself is different from type, size, material of the screw and the material of its mating part. Use it as
a standard to obtain an appropriate clamping torque.
The [Return torque method] in which once-clamped screw is returned with torque wrench or the
like is available as one of torque control methods. However, note that the measured values by the
return torque method generally appear in 10% - 30% lower than the actually clamping torque.
The torque checker measures the torque of screwdriver. The clamping torque of screw itself is
different from the clamped conditions. Understand the correlation between clamping torque values
and the torque checker values to perform the torque control properly.
CAUTION
Also in reverse rotation, the clutch is turned off in such manner as in normal rotation, stopping
the motor running.
Accordingly, when returning the screw tightened at a large torque, set it to a higher torque scale.
T
or
q
u
e
[N
・
m
]
Torque Scale
DLV7331
DLV7321
Summary of Contents for Delvo DLC1213-LUB
Page 11: ...11 Notes...