Sturtevant Richmont 10191, Руководство пользователя

Страница: 48 / 51

Why do joint simulators 80 ft.-lbs. capacity and higher have springs
instead of washers?
When the joint simulator is used with power tools, the washers wind up rotating around the
bolt as well as being compressed by it. This generates a considerable amount of heat. In
the washer sizes necessary for use in larger joint simulators, the heat generated by this fric-
tion during rundown is so high that in one or two rundowns the simulator is too hot for safe
use. To avoid this risk of injury, springs are used in the larger joint simulators.
I've tried many washer stackups and all the filters in every different combination and I still
can't get a perfect match between the torque reading on the
Torq-Tronics ®
and the results
of joint audits. Why and what do I do?
The many washers in the joint simulator are designed to permit great flexibility in joint
emulation. Combined with the five filter rates, incredible flexibility in tool/joint emulation
is possible. But the combination is finite - and the variety of joint/tool combinations to be
emulated is almost infinite. It is possible that the joint you are trying to emulate has a joint
rate between two of those attainable with the tester and simulator. Under these rare circum-
stances, two courses of action present possible solutions. The first is to use the simulator
and filter combination that gave results closest to the results of the joint audits. This is typi-
cally quite close - about 1%. The second possibility is not to use the joint simulator, and
use a correlative approach as described in the overview of power tool testing.
How often should Torq-Tronics ® be calibrated?
At least annually, more often if subjected to heavy use. Immediately if damaged or over-
torqued.