Posted by jsmith on September 10, 02 at 20:47:38:
In Reply to: got'a be thin coating and posted by Ben on September 10, 02 at 20:18:46:
::Yeah, any bonding agent used is going to increase thickness. Coefficient standards are per ASTM D4518. The gearboxes we use from ZED-F (Germany) use a special coating, very thin, on pinions and ring gears. I'll inquire what they use.
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: Thanks!
: The thing I'm designing is not very big, has moving parts that will be subjected to tough environment, has close tolerance parts, etc.
: Most of the stuff, as you are finding out, is more of a paint, or spray coating with a carrier and binding agent. All too thick, reduces the op temp range, increases the coefficient of friction (even though the stuff your shop uses is VERY low..0.23...need even lower...0.03).
: Memory is going, but do remember that the Molybdenum process isn't as good in terms of adhesion than Tungsten process, or was it the other way around... Moly does have higher tensile & temp range. All from memory, so don't quote me on this. Just remember the reviews with the customer and the questions their mechanical guys asked (turned out the prime didn't give us the full spec's).
: THANKS!!!