Posted by Indiana Ken on July 30, 2014 at 19:32:27 from (66.249.235.17):
In Reply to: Lock Washers????? posted by Jiles on July 30, 2014 at 08:35:48:
I would agree the bolt(s) must be properly torqued. This means that the bolt stretch generates a clamping load greater than the bolts(s) will ever see in service. If this is true then a locking device is not required and the bolt(s) should not lossen or fail in service.
Now for the above to be true a person(s) needs to determine the maximum service loads, select the number of bolts/bolt pattern and the torque value to insure a clamping load greater than the service loads. The fit up and bolt(s) mating surfaces must to proper to insure the torque wrench reading is indeed the torque on the bolt.
In summary a properly engineered joint should not require a locking device, for example, engine connecting rod bolts. In my experience it was common for bolts to lossen on farm machinery. This suggests that the time and expense to determine service loads and properly design the bolted joint did not occur. It is for these non-designed bolted joints that locking devices can be of benefit.
In summary a locking device can provide a reliable joint for non-critical applications and save the time and expense of detail design.
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