coefriction of friction question

[dunr]

Does anyone know how to find the coeficient of friction (cof) of a wooden shaft (oak) running in a teflon bush, & cof. of a teflon shaft running in a teflon bush
I need to know this for use in the making of a mainly wooden clock.

[NazNomad]

Not offhand, does the table halfway down this page make any sense to you?

http://www.roymech.co...ology/co_of_frict.htm

btw, I'd like to see pics of the clock when it's done. :-)

[ChuckFickens]

I agree, it would (wood!) be an interesting clock to see pictures of.

The type of wood you choose is going to make a huge difference to the cof with harder woods giving a much lower cof than softer woods. also for the best performing and lasting wood bearings consider oil soaking the wood before assembly (submerge it in groundnut or pine oil that's hot enough to boil all the water out the wood) or use a self lubricating wood such as lignum vitae (they used to make bearings for the prop shafts on ships out of that stuff!)

[dunr]

Thank's Naz & Chuck. I saw the list previously, & it doesn't show Teflon with wood.
I made a wooden clock before, & was advised by the designer, not to lubricate with liquids, so I used a 'Dry Film Lubricant' spray - (PTFE) - this works well but I have to strip it down every 6 months & spray again.
My next clock, I am going to line the wooden bushing holes with teflon, & make the shafts from Japanese oak. The question is - should I line the ends of the wooden shafts with teflon, thereby running teflon in teflon, or run oak shafts in teflon bushes?
Regarding pictures, the last clock took me 33 years, I am now 71, so don't hold your breath.
Coincidentally, 33 years was the age of Our Lord when he died for us on the cross!
Do you really want further contact with me?
Regards - dunr