Ariel JGJ Series, Technical Manual

Page: 26 / 141

F
OR
M
ODELS
: JGW, JGR
AND
JGJ S
ECTION
1 - D
ESIGN
S
PECIFICATIONS
& D
ATA
PAGE 1 - 20 1/01
3. Always apply a steady slow force to a torque wrench, do not jerk it. When a torque
wrench is jerked the amount of torque applied can be as much as one and a half
times the amount set on the wrench. For example, if a wrench is set at 80 lb x ft but
is jerked, 120 lb x ft torque can be applied.
4. Always do the final tightening with a torque wrench. Do not tighten the fastener with
a ratchet or impact wrench and then "check" the torque with a torque wrench.
5. Do not double tap a torque wrench. Rapidly double taping a torque wrench will
make the torque on the bolt more than what is set by a significant amount. If it is
desired to check the setting release all pressure on the wrench and then slowly
apply a steady force until the click is felt.
6. Always reset the torque wrench to its lowest setting when the job is complete. If the
torque wrench is left in a high setting the spring in it is stressed and will become
inaccurate with time. If the torque wrench is put back to its lowest setting the spring
will relax and retain its accuracy.
7. Do not use a torque wrench to break fasteners loose as it may overload the torque
wrench and/or cause loss of calibration.
8. For applications requiring the use of a boxed end or crowsfoot adapter with a torque
wrench to reach not readily accessible fasteners, the torque wrench setting will not
be the actual torque applied to the fastener.
1
9. The ratio of actual torque at the fastener with that on the wrench scale is a function
of the adapter's length and its position in relation to the torque wrench beam and
the location on that at which the force is applied (see Figure 1-11:).
Tw = Torque wrench setting, lb x ft
Ta = Torque required at fastener, lb x ft
L = Length of wrench, ft (from square drive end to center point of force on han-
dle)
A = Length of adapter, ft (measured through end of adapter on a line parallel to
the center line of the wrench)
These are general guidelines to assist in the proper use of torque wrenches. Consult with
your torque wrench dealer for more detailed information.
1. The exception is when the adapter is 90° to the torque wrench. The torque will be the same as on
the wrench scale (see Figure 1-12:).
Tw T a
L
L A +
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=