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material & coating for air bearings

material & coating for air bearings

material & coating for air bearings

(OP)
I have just designed an air bearing for a lightly loaded application using calculations from a book.
It has been manufactured and worked superbly when first tried until the outer sleeve (aluminium) particles I think jammed it up when it rubbed when the air was turned off.
The shaft which is static is steel en24 T
I was trying to keep the cost down and didnt grind finish and hone the bore of the sleeve. Am I expecting too much here.
What materials should I use and surface treatment? and what surface finish is critical for it to work?

RE: material & coating for air bearings

Dear John,

Looks like you have run into the lubrication problem of keeping you friction materials apart. Morgan Construction makes a fluid bearing that is similar to an air bearing. When the rotation was stopped, the inside sleeve and the outside sleeve came into contact. They developed a hydrostatic lube system that kept the sleeves apart even at stand still.
Unless you design the parts as if there were no air, this will continue to happen.
There is a company that is in New York state that makes a plastic -teflon bearing for riding on a smooth shaft.

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