Posted by ss55 on July 30, 2014 at 18:50:31 from (50.81.112.224):
In Reply to: Lock Washers????? posted by Jiles on July 30, 2014 at 08:35:48:
A few shops still specify split lock washers, most haven't for decades. I will still use split lock washers where pieces must be finely adjusted into position by hand. A lock washer maintains some bolt tension and some friction between the joined parts. That makes it easier to just crack the bolts loose and tap the joint around without it being completely loose. Jack screws on/or dial indicators help too.
I'm under the impression split lock washers were most useful when wood was still used in machines. As the wood under a bolt softened or compressed, tension on bolts could be quickly lost. A split lock washer is a short spring with 1/32 or more travel, it would maintain some tension on the bolt as the wood compressed.
On farm machinery made of soft steel, where components bend and flex, and the fasteners are all softer bolts, lock washers can work. Between hardened steel and grade 8 bolts, lock washers are about useless.
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