Any techniques on lapping?

[psychas]

what the title says someone said 20 strokes and turn the chip (talking about cpu) well i didn't do lapping before so enlighten me

 

[CyZMyAssBaby]

8 grades of paper ranging 400-2500 grit wet/dry
20 strokes and rotate cpu 90 degrees and 20 strokes again.

I use the intel processor backing that came with cpu to protect it whilst lapping.

You will need a small sheet of glass/ mirror to keep the lapping process flat and bowl of water. Wet sand paper with water and use paper towel to absorb excess water. Don't push down on it as you lap. The weight of your hands will suffice, without extra pressure. Go slowly so you don't use uneven pressure. After about 20 laps front-to-back, gently blot off the CPU/heatsink surface with a moist paper towel to remove the metal particles you just sanded off.

Then rotated CPU/heatsink 90°, and repeat 20 more laps front-to-back. Clean off the sand paper (by adding more water, and then blotting it damp and repeat). I'd recommend changing the sand paper frequently since it is really doing all the hard work for you. That's basically it.

You can start with 400 grit sandpaper and lap until you can't see variations in the surface of the chip. Then move up to 600 grit or 800 grit, and finish off with 1000 then 1500 finishing with either 2000 or 2400 grit sandpaper. It just takes longer with finer grits. I would recommend that you do NOT polish the heatsink base or CPU heatspreader with a metal polish since you'll leave behind residue that will hinder the heat transfer.

more info here http://forum.overclock3d.net/showthread.php?t=4735

 

[CyZMyAssBaby]

bump

 

[hardc0re_tid]

DONT use sandpaper, use Wet and Dry, lets just say its called that for a reason

 

[psychas]

wet and dry whats the difference? do they come as 400 , 800 , 1200 1800, 2000 ,2400 ?


edit: dumb me why you need water at this task ?

edit2: nvm found the guide of lapping ty all anyway