I don't know about the third item either except to say that eggs won't stick to them.
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| Coatings - gear cones and general piston skirt https://www.ausmini.com/forums/viewtopic.php?f=2&t=88970 |
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| Author: | FNQ [ Thu Mar 26, 2015 8:35 am ] |
| Post subject: | Coatings - gear cones and general piston skirt |
A few separate questions really. What parts in the gear clusters( thinking helical at this point) etc are supposedly coated and with what? - this question comes from reading in an overseas thread where where first thought baulk ring set up/ standard etc was the culprit.. it may be the cones?? Secondly Lots of examples of Race teams using REM superfinish polishing of transmission gears - microscopic deburring?? or more akin to minature shot peening to relieve stresses?? -- and are these two "things coatings/polishing" - mutually exclusive??? my thoughts along these lines is wondering whether SC gears would benefit from the REM finishing in the race car?? And another Teflon coating of piston skirts - just curious - does the thickness of the coating make a difference for piston/bore tolerance? - Any insight welcomed Darryl |
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| Author: | Mick [ Thu Mar 26, 2015 3:54 pm ] |
| Post subject: | Re: Coatings - gear cones and general piston skirt |
The synchro cones have a sprayed on layer of molybdenum (moly) on the surface to help the seating of the synchro ring onto the cone when matching gear speed to the input speed and reduce wear. Micro polishing is about removing stress risers in the machined finish. Shot Peening is the term I know it as. It takes off all the sharp edges and gives them a little bit of a radius, removing miro-burrs where fractures start. I think you would find however that the application of the moly to the synchro surface is not related to the gear polishing as the synchro does not bear transmission load. It just helps the gears mesh without noise. If you were to bead blast the gears however, the shot peen action would also peen the adjacent synchro cone, which would eventually remove the moly. I would guess this is where the two engineering concepts collide, you don't want to remove that moly coating. Option 3... not my bag sorry. |
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| Author: | peterb [ Fri Mar 27, 2015 6:51 am ] |
| Post subject: | Re: Coatings - gear cones and general piston skirt |
I don't know about the third item either except to say that eggs won't stick to them.
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| Author: | FNQ [ Sun Mar 29, 2015 6:47 pm ] |
| Post subject: | Re: Coatings - gear cones and general piston skirt |
thanks gents |
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