"david.tinker" wrote:
>
> Hello Dick,
>
> Thanks for your comments. I thought one would have to reduce the Tightening
> Torque (ie the setting on the spanner) when using lubricant , as with less
> friction one would get more tightening at the bolt with the same amount of
> effort at the spanner, thereby overtightening the bolt for a given setting.
>
> I shall have to dig out my Technical College books so as to refresh my
> memory.
This question came up years ago when I was working on an enormous 50,000
lb/sq. in. press. We were told that the only time torque values are meant
to indicate dry hardware is when it's clearly specified in the tables and
that normal torque values are *understood* to be for clean, then lubricated,
hardware. They suggested using a very small amount of copper grease.
-Rock
--
Rocky, JJ Cale Band & Pratchett Books: http://www.rocky-frisco.com
Rocky's Mini Cooper Page: http://www.geocities.com/MotorCity/6437/
Mini Books: http://www.geocities.com/MotorCity/6437/rockboox.html
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