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Lapping my waterblock but no mirror-like finish...

post #1 of 9
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Well, I am lapping my waterblock. Started from 220, 320, 400, 600, 800, 1000, 1200, and 2000. I am at 1200 right now and I can't see any mirror like finish, I can a pretty good reflection, but I still see a ton of scratches created from the sandpaper. I am using water with dish washing mixed in it and 3M WETORDRY sandpaper. Please tell me what I am doing wrong.
    
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post #2 of 9
You started at an incredibly rough grit...
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post #3 of 9
Do you have a pic of it? You shouldn't really have any deep scratches if your at 1200 grit already...You might want to drop back down to a 800 or something and take out the deeper scratches, then move on up to the finer grades...Most factory blocks come finished pretty well already...

I don't worry about making a mirror out of one as much as making sure its flat, I make a grid paper and keep checking it while I'm lapping, if the lines look distorted or wavy you'll know its not flat...


Edited by ira-k - 6/10/08 at 2:26pm
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post #4 of 9
I can almost gurantee its because your using water..after uve wet sanded it..use a high grit 1200/1500 just dry and youll get the mirror finish..but remember in lapping that is not the aim.
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post #5 of 9
Well remember the goal is getting it flat. As long as it is any minor scratches shouldn't harm temps. Try sanding on the 2000 in just one spot for a while. Use only water and let it go dry. Continue to buff it on the dry spot and you can get a shine.

edit: like they all said ^^^
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post #6 of 9
Quote:
Originally Posted by ira-k View Post
Do you have a pic of it? You shouldn't really have any deep scratches if your at 1200 grit already...You might want to drop back down to a 800 or something and take out the deeper scratches, then move on up to the finer grades...Most factory blocks come finished pretty well already...

I don't worry about making a mirror out of one as much as making sure its flat, I make a grid paper and keep checking it while I'm lapping, if the lines look distorted or wavy you'll know its not flat...

Well explained! REP to you.

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post #7 of 9
Thread Starter 
Here is an image I found and edited for checking the lap. It's a small picture, but I am pretty sure it is big enough for all waterblock/heatsinks. Thanks for helping me.
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post #8 of 9
Quote:
Originally Posted by sadiq View Post
Here is an image I found and edited for checking the lap. It's a small picture, but I am pretty sure it is big enough for all waterblock/heatsinks. Thanks for helping me.
Great pic! That would help nicely!
    
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post #9 of 9
Quote:
Originally Posted by sadiq View Post
Well, I am lapping my waterblock. Started from 220, 320, 400, 600, 800, 1000, 1200, and 2000. I am at 1200 right now and I can't see any mirror like finish, I can a pretty good reflection, but I still see a ton of scratches created from the sandpaper. I am using water with dish washing mixed in it and 3M WETORDRY sandpaper. Please tell me what I am doing wrong.
Just so you know lapping past 800 grit will not give you any extra performance/thermal transfer. going to mirror finish is for cosmetic value only.
Edited by nettwerk - 6/11/08 at 12:58am
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