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bolt preload

bolt preload

RE: bolt preload

Hi Christopher,

I think the picture was just a woodworking clamp like this one. With pivots at all screw interfaces.
http://img1.etsystatic.com/000/0/6188818/il_570xN....


I think I was trying to say that even with a very short fastener length tightening the fastener still exerts a force (on the hapless creature trapped in the jaws). I think "preload" is the force exerted, not whether a significant hunk of fastener was stretched elasticly to generate the force. Short grip length is always a poor design feature on a hard working bolted joint because it is so vulnerable to preload loss from small amounts of relaxation, embedment etc.

The widely maligned torque/tension tables can be used to get a useful feel of how much clamping is generated by tOrQuinG a fastener of any length. I think the admittedly potentially more accurate Turn of the nut or bolt stretch methods are in trouble when used to secure thin parts like these.

http://image.musclemustangfastfords.com/f/31849875...
http://c564296.r96.cf2.rackcdn.com/Articles/2011/1...

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