Lapping

I would suggest 800 would be the min. Try and rub 2 pieces of 400 together, that will make them finer. Also ensure that you use water/oil when lapping.
3 in 1 or similar will do the trick.

Matt
 
mattup said:
I would suggest 800 would be the min. Try and rub 2 pieces of 400 together, that will make them finer. Also ensure that you use water/oil when lapping.
3 in 1 or similar will do the trick.

Matt
Click to expand...

Oil? Wtf! I thought oil was the worst thing that you could put on a heatsink.

Apparently it goes in the microscopic pores so the cooling is VASTLY inferior not matter what sort of cooling goes on it.

It would be the worst thing you could do.

COuld be wrong, but ill try and find a link :o


Also get some finer stuff than that. My new lapping kit which should be arrivng goes up in the thousands, finished of with some gel which has an abrasion of 10.000


***!
 
l33t-krew said:
Oil? Wtf! I thought oil was the worst thing that you could put on a heatsink.

Apparently it goes in the microscopic pores so the cooling is VASTLY inferior not matter what sort of cooling goes on it.

It would be the worst thing you could do.

COuld be wrong, but ill try and find a link :o


Also get some finer stuff than that. My new lapping kit which should be arrivng goes up in the thousands, finished of with some gel which has an abrasion of 10.000


***!
Click to expand...

Yeah think your right, ive read the same thing somewhere, WD-40 and the like isnt designed to evaportate so it gets trapped into the microscopic holes and reduces cooling efficiency greatly.
 
Yeah so your best off using Wet sand paper. I've read somewhere that its best to alternate it Wet>Dry>Wet>Dry etc. Not sure if thats the best method tho so your best off searching around until you find a definate answer. :)
 
I've bought 400 and 800 wet and dry for my lapping escapades, haven't got round to using it. Have always used water when lapping in the past and only a few drops. Also remember to wash the wet and dry under a tap regularly to get rid of the metal material that builds up on the paper. I also use masking tape to mask off areas other then the surface to be lapped, help in the cleaning up process after as you simply peel of the tape and throw it away.
 
Most people see a drop of a few degrees C. Some people see no change. Some people see dramatic drops of 10+ degrees C. It obviously depends on what the interface was like before you lap and what sort of job you do. I suspect that the big drops are half lapping and half down to poorly seated coolers in the first place.
 
Sorry chaps. I thought it was obvious that you had to clean the lapped surface off with a solvent!

The AS instructions, say not to clean the IHS off with WD40.

Ps what do you think most heat conductive greases are made of???



Matt
 
If using a lubricating oil, then conduction may well be inhibited... but considering AS3 got its behind handed to it in the conduction arena by toothpaste (minty, I believe), I think the temperature difference will be pretty hard to notice.

And for those of you doling out the wonga for lapping kits? Make sure your heatsink base is properly wonky and undulating before indulting in a bit of wet'n'dry: the whole point of HS lapping is to flatten itssurface so that its contact with the CPU is better, giving better conduction. The chances are that a few attempts may make that contact worse than it was before.

If you HAVE to lap, i.e. have an irresistable, diagnosed-by-a-mental-health-professional urge to indulge in an incredibly boring activity, make sure the CPU is lapped, too, because they are often more concave than the heatsink surface.

So think before you do. As with pretty much everything in this life.
 
You must log in or register to reply here.
Back
Top Bottom