Material with high coefficient of friction and good structural integrity for friction washer.
Material with high coefficient of friction and good structural integrity for friction washer.
(OP)
I’m looking for a material to give me high coefficient of friction (against steel) and good structural integrity in a 20mm o’d ish washer. The washers will be clamped against the steel offering functionality like car brake pads on a disk. But cheap, simple and small.
Any advice the best material would be much appreciated. Ideally the washer shapes would be pressed from sheet.
Any advice the best material would be much appreciated. Ideally the washer shapes would be pressed from sheet.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Material with high coefficient of friction and good structural integrity for friction washer.
TTFN (ta ta for now)
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RE: Material with high coefficient of friction and good structural integrity for friction washer.
See sketch attached. The lever length can vary so the tension of the nut would be set to suit and give a good “feel”. Resistance to movement needs to be positive but easily adjusted.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
Also, use the nut to compress a spring against the washer. This will provide much more uniform sliding over a wide range of conditions as well as compensate for wear.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
I agree with Tug on this; a high static friction will likely cause more judder.
TTFN (ta ta for now)
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RE: Material with high coefficient of friction and good structural integrity for friction washer.
If you need stack them in opposing directions to gain some travel if you need that.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
You might have to resort to a bicyle type brake and handle actuator to get something that has a big difference between static and dynamic friction. That will only increase your cost by a factor of 10.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
You could also use a cam lock similar to a bicycle skewer, which would be cheap and very adjustable.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
Stacked with some Belleville springs to keep the force sort of consistent.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
The plan was always to use belleville washers and a high friction washer of unknown material. Perhaps my error is proposing a high friction material.
A similar mechanism has a thumb screw and steel washer that never works well. Unable to set the pressure accurately and needs a better friction interface. It's semi ok to lock off, but on the fly sliding adjustment is poor. We will try low friction Pa6 (it's readily available) or a hard urethane.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
The Belleville washers solve that problem.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
Could you use a compression spring on the thread/nut adjuster, so that you tighten the nut and compress the spring, which then changes the force on the washer altering the friction?
“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein
RE: Material with high coefficient of friction and good structural integrity for friction washer.
RE: Material with high coefficient of friction and good structural integrity for friction washer.
It was just a thought, do you need a lot of these washers? If it’s just a few you could design a pre bent single leaf spring, I done that sort of thing for holding a aluminium light reflector in a ceiling lamp.
“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein