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Old November 4, 2008, 04:20 PM
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Default Lapping A processor E2180

Hey guys i finally got around to lapping a processor i used a e2180

steps i did

Used wet&dry automotive sand paper
400 grit
600 grit
800 grit
1000 grit
1500 grit
2000 grit


Ok i started off by placing a sheet of glass on my marble countertop
then i taped the sand paper to the glass

i started moving the processor back and forth for 30 times then i would spin the processor and do it untill i made my way around the whole cpu

i replaced the 400 grit and did it again 30 times each side

i did this all the way up to 1500 grit

i cleaned the top of the cpu off with alcohol

then i taped down the 2000 grit sand paper
and procided to move it in a figure 8 pattern
i did this for a long time i used 4 sheets of 2000 grit

after that i clean it off and this is what i got

what do you guys think? its really flat now and looks like glass



i did notice about 8-10 deg drop also i did not use and thermalpaste as it vacumedlocked itself onto the heat sink btw i did the heat sink the same way


have a look and no i did not use any kinda polish to make it look like this
just a bit of alcohol and thats what i got



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Old November 4, 2008, 04:32 PM
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Wow! It looks like a mirror! Good Job!

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Old November 4, 2008, 04:36 PM
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Just so people know.. lapping is about mirror finish.

Lapping is just to simply get the HS on the cpu flat.

People just make it shiny for personal preference but it yields little benefit.
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Old November 4, 2008, 05:03 PM
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lapping is NOT about mirror finish, I think thats what you meant. Agreed. To me it just takes some extra time to make it look nice even though it's just going to get covered by a cooler.
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Old November 4, 2008, 05:22 PM
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Yep, hence the OP's comment about the finish not being polished... :)

Looks great though!!!

Never did take the plunge myself, but I've got a fried E6420 here waiting for me to practice on it before I try doing my quad. (E8400 would probably benefit most as it's got a 7C split, but I'm not convinced that's the IHS).
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Old November 4, 2008, 05:25 PM
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well from what i have learned over the years... lapping metals when done proper the will stick together with out anything airlocks it self together all i know is when i touched my heatsink on my processor i could pick it up of the counter and it did not want to come off untill i slid my processor off of my heatsink
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Old November 6, 2008, 08:55 AM
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Quote:
Originally Posted by sswilson View Post
E8400 would probably benefit most as it's got a 7C split, but I'm not convinced that's the IHS.
My e8400 (e3110 actually) has the same issue ~6C diff between cores and what what I've read is pretty common with the e8xxx (and equivalent xeon) series. Mine seem to idle at the same temp but when put under load one jumps up in temp and one barely moves, IIRC they said the one that does move is accurate and the one that doesn't is 'stuck' whatever that means. But if you try it make sure you let me know your results.

Quote:
Originally Posted by Cptn Vortex View Post
lapping is NOT about mirror finish, I think that's what you meant. Agreed. To me it just takes some extra time to make it look nice even though it's just going to get covered by a cooler.
I really can't see how polishing it makes it any better and probably makes it a little worse than where it was left off with the 2000 grit. When lapping with the wet/dry you are making the IHS take the shape of what you're lapping against - hopefully a good quality flat. Of course you're at the mercy of variations in the thickness of the paper but hopefully the end result is a surface that is accurate to withing fractions of a thousandth of an inch. When polishing done with poling compound and a cloth on the end of your finger you're for the most part removing material randomly so the accurate surface is no longer intact. But yes I agree it does make it look pretty.

The way to polish properly is to polish it against a known flat surface too. I'm not sure how that could be done with commonly available materials. One possible solution is to use a paper lap. Lay a piece of paper of what you used as a flat surface and spread some polishing compound on it (less is more) then use that like you did the wet/dry. The particles that do the polishing (probably a low grade cerium oxide) should embed itself in the paper and give a proper flat polish. I know this method is used in optics fabrication, and while it gives a somewhat ugly polish when talking about the accuracies need for optics it should be pretty kick ass for the accuracies we need.

Of course all this is splitting hairs and probably unnecessary anyway.
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Old November 6, 2008, 09:39 AM
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did the op say he didnt use thermal paste? That seems reasonable, though ive never seen it done b4
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Old November 6, 2008, 10:04 AM
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nope did not use thermal paste nor did i use and compound that what it looks like comming off of the 2000 grit

but i did notice a 8 degree drop at idel temp tho when i have my cooler fan jacked up i seen 10 degree drop so it did not work out to bad at all
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