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Lapping question

post #1 of 6
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So I followed this lapping guide:


But I'm getting some issues with the final touches....

I'm getting a much smoother more reflective surface with 1200 grit paper than I am with 2500.

As soon as I try using 2500 grit paper it just looses all shine and becomes covered in scratches.

Any thoughts?


Edit:

I'm practicing lapping on an old D-Tek Fuzion block at the moment.
    
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post #2 of 6
From my experience 1200 can also give a nice result, especially if you pour some water on the sandpaper, not too much, you don't want to bathe the CPU

My 2 cents: stop when you have a mirror finish, no point in searching for more than that.
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post #3 of 6
I'm no expert, but are the different grit papers from the same manufacturer?

Go for the 1200 grit, I have read somewhere else that a 1000 grit quality sheet is much better than a 2000 grit that can't be counted coming from a respectable manufacturer (using the 1200 grit and slight pressure).

I'm going for my last lapping, and I got much better results from using 400 grit paper with some metal polish than from 1000-1500-2000 that must be non quality sheets (non polish).

So I'm going to get some 1200 grit now, and post the results.

But hey, if you can reflect distant objects from the surface, and its even, use it.
Much more important that the surface is flat, and that is without it being mounted to the water block (if it's a cpu block. Mounted to the rest of the block, should probably have a bow to it)

I haven't seen the video yet, but I have to run out the door now

Oh, and you should have some lubrication ofc, there are different approaches out there.

Here is one
Edited by NorxMAL - 5/4/11 at 2:36am
post #4 of 6
Thread Starter 
Quote:
Originally Posted by NorxMAL View Post
I'm no expert, but are the different grit papers from the same manufacturer?

Go for the 1200 grit, I have read somewhere else that a 1000 grit quality sheet is much better than a 2000 grit that can't be counted coming from a respectable manufacturer (using the 1200 grit and slight pressure).

I'm going for my last lapping, and I got much better results from using 400 grit paper with some metal polish than from 1000-1500-2000 that must be non quality sheets (non polish).

So I'm going to get some 1200 grit now, and post the results.

But hey, if you can reflect distant objects from the surface, and its even, use it.
Much more important that the surface is flat, and that is without it being mounted to the water block (if it's a cpu block. Mounted to the rest of the block, should probably have a bow to it)

I haven't seen the video yet, but I have to run out the door now

Oh, and you should have some lubrication ofc, there are different approaches out there.

Here is one

It's all Halford's sandpaper, so probably not great quality admittedly (even so a higher grit should be a higher grit). I do have another pack of the 2500, so I might give that a go, I also have some 1500 so I'll try that too.


Also, since I'm using a waterblock, I have a long way to go through the copper, which works well for practicing.



Want to get it right though so I don't kill my 930 which I plan to do later in the week



Oh, and, using water actually seemed to make the scratching worse than using dry... : /
    
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post #5 of 6
The scratching when you switched to the 2500 grit paper is most likely due to having a spec of something else between the block and the paper, or even between the paper and the glass.

Really though, there isn't much point going finer than 600 or 1000 grit paper.
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post #6 of 6
I only went as far as 1000grit when lapping my old Q6600.
I used wet paper for all the steps. Just a dab of water will do ya.
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