graphite bushes/bearings ?

Lol, second that.

* Danny M *

Edited By Danny M2Z on 22/02/2016 10:54:37

And don't forget, most Nylons are hygroscopic so clearance can be affected. Don't apply to Carbon Carbon/Copper.

Regards Ian.

you can mock me if you like but i know we live in a world of possibilities, no matter how unlikely it might seem. I believe coarse humour is detrimental not only to the recipient but to the mocker themselves.

Michael W

I bought some graphite rod from these;

**LINK**

Seems to be good quality and machines nicely, I have about 6" of it left, if your in the Sheffield area you can have half of it for free.

Otherwise I used to machine carbon or graphite impregnated PTFE, should be quite easy to get hold of. Seal manufacturers may give you some, or fluorocarbon uk make it, or GAPI uk will stock it. It's not hydroscopic, very easy to get a good finish and has little thermal expansion.

As Circlip says, do not use any nylon it will expand when the moisture hits it, normally about 1-2%.

Michael No one was mocking you It was a straight forward question

My reason for mentioning that some motor brushes contain copper is that copper is very poor as a bearing material and may result in too much friction.

Nothing to do with electrical conductivity!

Russell;

I raised the subject at work today and, as previously, the cost of processing such a small order is deemed to be much higher than the cost of such a small piece of graphite, so not really viable.

But I can supply a piece (the offcut to hand is approx. 14 x 20 x 85mm fine grained isostatic graphite) FOC subject to receiving pictures / a video of the completed engine which the company might use on it's website as a "general interest" application story.

If that is acceptable, PM me your address details & I'll post the piece out (the company will provide the graphite & I will stand the postage).

Nigel B.

(edit for typo)

Edited By Nigel B on 24/02/2016 10:03:16

Been doing a bit of hunting, found this. JC4 grade, strong, fine grain, machinable. Another one is Poco grade carbon, this one contains copper. Then EDM grade.

G.E. Howell sell's it by the inch, 3/8"D, 5/8"D, 1"D, at $1, $1.50, $2.50, this is for pistons.

Ian S C