Filing a gasket mating surface

I jus' chuck 'em up in the ol' CNC mill and skim a half a thou off 'em.
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Good how-to Gary.
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Another method is to use a piece of plate glass, smear valve grinding paste on the mating surface and rub away.
It's a good technique, used this method for the rocker boxes on a Triumph TR6. But the bloody thing still leaked other places . . .
 
+1 on the plate glass. You can also tape down wet-or-dry paper, 320 or 400, and move the workpiece in a figure 8. Apply dye (felt tip marker works too) to the surface you're working; when the color is all gone, it's flat.
 
Nice watch, who does you manicure.
Yeah just call me boomer.
Manicure by old corroded MC partz mostly. :rolleyes:
yes working a flange on a flat surface is a great way to go.
bbbBut nearly everyone has a file handy (finer is better)
Filing = just aluminum swarf, no abrasives sneaking into internal crevices. :sneaky:
A file also can be used on faces still in place on the bike, say the crankcase mating surface for the clutch cover. or a face with protruding features.
Nice big new abrasive stones with mineral spirits are often used on machine surfaces like a mill table to knock the edges off dings, get rid of rust. etc. Aluminum tends to plug up stones pretty quick.
 
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Yet another method: Apply grinding past to the cover, place cover on crankcase, insert one screw and work back and forward, then shift the screw diagonally opposite and repeat, and so on.
 
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