All Springer/NP/PCP Air Gun Discussion General > Machine Shop Talk & AG Parts Machining
Explain Burnishing with Moly
DMikeM:
My idea of burnishing something is to rub like materials together to produce a shiny and smooth contact point.
Can someone explain what it means to burnish with moly?
airiscool:
"Burnishing" just means to make something shiny, or smooth by rubbing, doesn't have to be done with like materials. In metal working, "burnishers" are a tool that's uaually made of a harder metal than the surface needing to be burnished.
I haven't come across the term before this, but my guess is "burnishing with moly" just means to rub the surface with moly and only leave enough moly to make the surface shiny. "Moly" (molybdenum disilfide) being a high pressure lube additive will actually inhibit rubbing a surface smooth, so the term may mean just making it shiny by "wetting" it.
That's what I did to the combustion chambers of my guns, but with silicone grease, not moly. I coated the surface, then wiped off the excess so that there's only enough to make the surface appear shiny. I've heard that anymore than that on the surface can contribute to dieseling.
Paul
Pete:
Hi..
what happens when yer use moly...Is moly cointains metal & that
metal fills the imperfections in the steel that can't be seen with
the eye...gives a smoother surface for the seal to run on...same
on trigger contact surfaces......moly is not a long term lube..
Great for when yer assemble engines to protect plain berring/cam
surfaces till oil pressure is built up...
Pete
Alan:
Burnishing with Moly links...
http://www.snipercountry.com/articles/barrel_breakin_II.asp
http://shootersforum.com/showthread.htm?t=46893
http://www.airgunadvice.net/viewtopic.php?t=5765&view=previous&sid=bc607f5d40fef5a673bebe16b40ef7e8
This one gets deep...
http://wethearmed.com/index.php?topic=7558.25;wap2
airiscool:
Thanks for the info Pete, Alan.
I've used cam and piston ring manufacturer's "break-in lubes", but never knew what was the secret ingrediant.
I've made tooling for and burnished new bronze kingpin bushings in antique cars, as was done originally to give smoothness and extended life, and the differance between burnished and just "reamed to size" is amazing !!! Reamed to proper clearance and it takes two hands to turn the front wheels with the car jacked up. Burnish the brearings to finished size and just the pressure from one finger pushing on a tire sidewall will turn both front wheels.
I didn't know about the moly aspect of certain applications of burnishing though. Good to know.
Paul.
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