Bearings/Bushing, Dry Film Lubrication, Grooving....
Bearings/Bushing, Dry Film Lubrication, Grooving....
(OP)
The current bearing I'm dealing with is produced in house, and is made in a variety of sizes. The bearing is a multiple piece unit which incorporates a bushing, thrust washer, and a ball race (which retains our stationary peice to our peice in motion).
The bushing (kinda a misnomer, we just refer to it as the bushing) is a journal bearing, made from a Beryllium Copper alloy C17200 with about a 41HRc. We press this into the peice in motion with a .003" interference fit. We currently plate the bushing with silver .001" (+/-.0002") thick.
An example size of this bushing is 2.003" OD x 1.875" ID x .625" WIDTH.
What benefits/pitfalls would I have to doing a molybdenum disulfide or a polytetraflouroethylene dry film coating? Any suggestions?
Also, I've been playing around with the idea of adding a spiral groove to the ID of the bushing. Our system is lubricated with a propreitary degassed molybdenum grease.
Thanks!
The bushing (kinda a misnomer, we just refer to it as the bushing) is a journal bearing, made from a Beryllium Copper alloy C17200 with about a 41HRc. We press this into the peice in motion with a .003" interference fit. We currently plate the bushing with silver .001" (+/-.0002") thick.
An example size of this bushing is 2.003" OD x 1.875" ID x .625" WIDTH.
What benefits/pitfalls would I have to doing a molybdenum disulfide or a polytetraflouroethylene dry film coating? Any suggestions?
Also, I've been playing around with the idea of adding a spiral groove to the ID of the bushing. Our system is lubricated with a propreitary degassed molybdenum grease.
Thanks!





RE: Bearings/Bushing, Dry Film Lubrication, Grooving....
Mike Halloran
Pembroke Pines, FL, USA
RE: Bearings/Bushing, Dry Film Lubrication, Grooving....
RE: Bearings/Bushing, Dry Film Lubrication, Grooving....
RE: Bearings/Bushing, Dry Film Lubrication, Grooving....
RE: Bearings/Bushing, Dry Film Lubrication, Grooving....
RE: Bearings/Bushing, Dry Film Lubrication, Grooving....
Yes, in a "wet" boundary condition, neither MoS2 nor PTFE will serve you. Both function as dry film lubricants.
What problem are you trying to solve? Have you identified the mode of failure? Friction, itself, is a system-dependent parameter and function of load, velocity, temperature, surface finish, counter-face, material hardness, etc.
Grease tends to cold flow, displace under contact stress. To try and direct the grease, through spiral, at the right rate seems implausible. Not to mention depletion of lubricant.
You may want to see this link:
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William Gunnar
http://www.IndustrialCoatingsWorld.com
RE: Bearings/Bushing, Dry Film Lubrication, Grooving....
RE: Bearings/Bushing, Dry Film Lubrication, Grooving....