lapping sk-6 question...

[ku]

I tried lapping it with 1000 grit, etc... and when i got up to 1500, i realized that the middle is still rough. It's like the sand paper can't reach it. After I found out, i went back to 400grit and worked my way up and found it was the same. I drew a grid and tried for a while but the middle was untoouched. anyone know why this is? would more force and time help in getting rid of this?

 

[CorCentral]

It seems as though the outer edges of the HS are higher than the middle . This happens when you use sandpaper without a sanding block of some sort . You'll have many inconsistancies without one .

Example : Imagine taking 60grit sandpaper to a piece of wood & sanded in one spot for too long ............ You get Valleys/Grooves in the wood , correct ?!?

Use a hard foam block larger than the HS & accompany it with 1200 grit sandpaper & sand away until the surface is to your liking . This will provide you with much conformity & will be very true in the end .

 

[ku]

i was using the side of my case which is pretty flat. Do I need it to be more flat? What can i use around the house?

 

[CorCentral]

Just be patient sanding , for the side of your case is sufficient , I would suggest in the future , a small foam block .

 

[FlowerMan]

Is the side of your case made of glass? if not, its probably not flat enough. Use a piece of glass from a picture frame. The object you lap can only get as flat as the surface you lap it on. The method in which you lap also affects its flatness. Use a circular or figure-8 movement, not back and forth. I've never had a problem with lapping, so it must be because you're lapping on the side of your case, lol

 

[ku]

arrite, i'll try using a piece of glass. the thing is, when i was using the side of my case, every other part of my heatsink was REALLY nice except the middle part.