P.T.F.E fork bush trials...."O" well

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john robert bould

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After some trials, i have concluded p.t.f.e in its virgin state did not produce a stable bush, It's Modulus is poor and no memory , distortion under load is the key factor...But some tests with Oilon are looking better, slightly more friction .15 compared to .04 ...But the resistance to wear is 25 times better than p.bronze!..More updates later.. John lansdowne Eng
 
john robert bould said:
After some trials, i have concluded p.t.f.e in its virgin state did not produce a stable bush....
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What you need is bronze filled PTFE like Trelleborg Turcon T46 which should be available as bar stock. Far stronger and if you etch the finished part to remove the bronze just from the surface you actually have the stiction ofr virgin PFTE combined with the strength of bronze filled PTFE.


Tim
 
Other option is DU lined steel bushes, the DU (PTFE ) is impregnated in a sintered bronze surface which was sintered onto the steel.
 
Yes That sounds good!! Been on the net and checked it out,,Thanks Tintin.
Tintin said:
john robert bould said:
After some trials, i have concluded p.t.f.e in its virgin state did not produce a stable bush....
Click to expand...

What you need is bronze filled PTFE like Trelleborg Turcon T46 which should be available as bar stock. Far stronger and if you etch the finished part to remove the bronze just from the surface you actually have the stiction ofr virgin PFTE combined with the strength of bronze filled PTFE.


Tim
Click to expand...
 
kommando said:
Other option is DU lined steel bushes, the DU (PTFE ) is impregnated in a sintered bronze surface which was sintered onto the steel.
Click to expand...
Cheer's Kommando, are the bush's available in Norton slider size? Regards J.R.B
 
Generally I've always regarded all the ptfe bearing options which include glacier type and the filled materials as problem solvers where there's marginal or no lubrication AFAIK they don't have a lower coefficient of friction than a well lubricated metal bush.

I can understand why the fork lower bush might be worth replacing with a glacier bearing but its not got anything to do with friction, I'd rather wear out a replaceable bush than an expensive aluminium fork slider.
The top bush is very well lubricated, I doubt very much if you'll see any better performance from plastic.

So what's the point?
 
The point is to use modern materials to inhance the performance of older machines, engine valves have been improved, belt drives, stainless parts,tyre compounds, up graded brakes, ie goodrich hose's, synthetic oils, halogen bulbs, and lastly improved cartridge Lansdowne damper :lol: so what was the point of all those :?:
 
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