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About to lap T.R.U.E.

post #1 of 12
Thread Starter 
im seconds away from lapping my TRUE, i have the sandpaper taped down on a piece of glass. Whats the best procedure to follow for lapping, im not going for a mirror finish cause i only have 320, 400, 600 and 1500 grit. How do i know when i switch up the grit?

also does anyone know of a good guide for lapping a CPU?

Thanks

EDIT - question at bottom of thread
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post #2 of 12
Quote:
Originally Posted by Nick226 View Post
im seconds away from lapping my TRUE, i have the sandpaper taped down on a piece of glass. Whats the best procedure to follow for lapping, im not going for a mirror finish cause i only have 320, 400, 600 and 1500 grit. How do i know when i switch up the grit?

also does anyone know of a good guide for lapping a CPU?

Thanks
Methinks this one is very well done. It's got diagrams, illustrations, and easy-to-understand text.
    
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post #3 of 12
Thread Starter 
yea i took a look at that one, the only thing that confuses me is am i suppose to do diagonal strokes?
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post #4 of 12
Quote:
Originally Posted by Nick226 View Post
yea i took a look at that one, the only thing that confuses me is am i suppose to do diagonal strokes?
GuardianOdin's guide recommends it, clearly. However, I've done several lap jobs and have seen reductions in temperature without using diagonal strokes myself.

I think the key thing to remember is that the key result is flattening your mating surfaces (CPU IHS and HSF base); the flatter they both are, the more of their surfaces are in contact with each other, which means improved thermal transference. This also means you'll need less TIM.

Good luck with your lap job!
    
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post #5 of 12
Quote:
Originally Posted by txtmstrjoe View Post
Methinks this one is very well done. It's got diagrams, illustrations, and easy-to-understand text.
This is the guide that I used.

GL, keep your base flat at all times and be patient.
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post #6 of 12
I did mine twice. The first time, the temps got worse, the second they improved. Second time i fine tuned it with 1200 wet/dry with some oil on it. Smoothed out any scoring lines I left and gave it a more polished finish.
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post #7 of 12
Thread Starter 
Thanks guys,

i just finished lapping my cpu and TRUE, i think it turned out really well....better then i expected..mmy last question now is, should i do a line of AS5 or the half a grain of rice method (dot in middle)? I heard that after lapping you have to use alot less thermal paste.
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post #8 of 12
After lapping you really only need a very small dot right in the center. If your lap job is good enough, the even pressure applied by the heatsink will properly spread the AS5.
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post #9 of 12
I use the line still after lapping and got good temps. Try a couple of different ways if you want, it couldn't hurt. I got my best temps one time putting a tiny cross in the middle of my chip, but couldn't replicate it the next time I tried. I think many times it matters more how you put the block down on the chip.
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post #10 of 12
Imo after lapping you should use a plastic bag over your finger and spread a very thin coat of as5 over the cpu. Then mount the cooler and take it right back apart to ensure you have 100% contact. You can also just use the thin line/dot for this if you want. You just need to make sure the lapping is actually done. If the heatsink/cpu as5 isn't spread out evenly after taking it apart, then you know you either A) need more as5 in certain areas or B) need to lap them again.
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