Quote:
Originally Posted by lindy 911
A torque wrench with an extension is no longer accurate. The extension becomes part of the torqued connection and will flex and absorb part of the applied torque
Lindy
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Lindy, I don't agree as you can't really destroy a force at the level we are discussing and the elastic deformation in the extension will have no real influence.
I would agree that the twist will make angle measurement impossible but the applied force will be unaffected.
If the extension is too long and affects alignment then measurements may also become inaccurate.
Thin Lock Nuts are interesting products.
In general there is no formal specification for this type nut although they are commonly manufactured from a Grade 4 material, in general the softer the nut the better it works but within sensible limits.
It isn't common practice to specify a torque for this type of nut as they are only used to prevent loosening due to vibration and if preload was an issue they would be used in conjunction with a full strength nut which would be used to apply the correct force.
For this application preloading of the adjuster isn't required.
In general these nuts only need to be tightened to a 'snug' fit which I realise isn't entirely helpful but there isn't really a good answer.
I would tighten them by around half a turn from their 'closed' position which should be good enough and much easier to see.
It may also be more consistent in terms of the effect on the tappet clearance due to movement whist tightening the lock nut.