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Lapping with metal polish?

post #1 of 8
Thread Starter 
Stupid question, I guess.. But can you lap a processor with metal polish? I experimented with a cpu cooler a while ago.
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Oxygène
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post #2 of 8
Don't you want it as flat as possible. Not just shiny?
    
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post #3 of 8
Thread Starter 
That is correct. It does get flatter after some rubbing. lol
Oxygène
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Oxygène
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post #4 of 8
Polishing is just for e-peen AFTER you lap it. Pointless before it's lapped..
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post #5 of 8
Thread Starter 
Let's go shopping for some sandpaper then. smile.gif Just figured that metal polish is somewhat equal to really fine grained sandpaper.. Now I don't have to ask that question again. Thanks guys.
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post #6 of 8
Well it probably is, but that doesn't mean it's flattening it. It's just making the curved areas shiny.
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post #7 of 8
Lapping/polishing can be done in a way that produces both smoother surface and a flatter surface. The trick is that you must have a surface to work from that is known to be remarkably flat. ....

ideas...

http://www.starrett.com/pages/860_granite_surface_plates.cfm

http://www.use-enco.com/CGI/INSRIT?PMAKA=640-0100&PMPXNO=947969&PARTPG=INLMK3

Polishing compounds are common for final lapping to produce very smooth and flat surfaces. aluminum/metal polish works. It IS like very very fine grit sandpaper.


I played around with aluminium mag polish on an older heat-sink we had laying around from back in the athlon XP days. The surface on that sink was horrendous. It had very large machining grooves in it. I put it on my mill and ran an end-mill across the surface at very high RPM and low feed until all of the previous machine etches were eliminated, (of course, my machining etches remained, but they were remarkably shallow, felt smooth to the touch already) then moved onto polishing with that mag-polish. The result was pretty good, but probably only about as good as it ought to be from the factory nowadays anyways. I suppose if I had started with some very fine grit sand-paper and then gone to the polish the results may have been even better.
Edited by mdocod - 3/19/11 at 1:46am
     
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post #8 of 8
you dont want to use any type of polish after or for lapping as it leaves residue which will negatively affect the heat transfer properties, if you want shiney keep lapping using higher grit paper
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