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Lapping question

G

Germz

Limp Gawd
Joined
Jan 14, 2007
Messages
164
I want to lap my CPU & NB HSF and all the lapping guides i read tell one to wetsand it using water. They do say that water prevents the metal shavings from building up and its used for lubrication purposes. They only thing they dont tell you is how much water to use, a few drop, an ounce??? Anyone know?
 
On the heatsinks it is less important, but you should make sure it is a thin layer so that the shavings can float, but not run. The issue is that the shavings and water can get into spaces and eventually come out and that would not be good after being reinstalled in the case.
 
you only need a few drops
after some sanding you might need to add a few more
you just need to see how it goes
 
Step 1: Add few drops of water on the sand paper then start sanding.

Step 2: When the water starts to dry up, add few more drops then continue sanding.

Step 3: Repeat step 2 until you get to your desired smoothness.

If you want to take additional precautionary measures, apply some electrical tape with the plastic protective cover on to prevent microscopic metallic debris from getting on the chip.

It helps to clean the outer edges of the heatsink with alcohol to ensure good tape adhesion.

cpu1.jpg


cpu3.jpg


Remember to thoroughly clean the sanded area with alcohol before taking the tape off.
 
I typically keep a bowl of water with me when doing the sanding. Whenever the sandpaper starts to show signs of metalic buildup I'll dip the sandpaper in the water to clean it off. Whatever water stays on the sandpaper after dipping it is what I use. The water isn't going to hurt anything so long as you let the CPU dry thoroughly before putting it back into the motherboard.
 
LOL I didn't use any protection on my CPU while lapping it LOL, just cleaned it with rubbing alcohol, no problems here ;)
 
His case was special - it was the flattening rather than the smoothing (if that makes sense), because he had an uneven heatsink contact.
 
Quigon said:
His case was special - it was the flattening rather than the smoothing (if that makes sense), because he had an uneven heatsink contact.
Click to expand...

That's the whole point to lapping in the first place. There's no point in lapping a surface that is already flat.
 
illdklli said:
not sure if u saw my thread.

http://www.hardforum.com/showthread.php?t=1363613

i didn't use water, nor do i put tape all around the chip. just used the plastic that came with the chip. everything seems to be ok.
Click to expand...

I do the same thing. Use compressed air and an old tshirt to just clean off the metal on the sandpaper. No tape, no water.

I start with 100 grit, move to 400, 600 then finish with a quick 1500.

Here is how my last one turned out.

IMG_1488%20%5b%5d.jpg
 
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