Lapping question

Yurka · 23 Apr 2009 at 20:15

I could only get my hands on 600 grade sandpaper. Should I bother using it if I can't get anything finer to use for the final stages?

KingZeddy · 23 Apr 2009 at 22:11

You will end up with a nice brushed rather than smooth finish, I would recommend getting uber fine 2500

/Thom\ · 23 Apr 2009 at 23:19

why would you recommend that? you will still be able to get the chip nice and flat but is that why you are doing it or is it just to get a shiny chip? cause if its jsut for shiny thats a bit e peeny tbh

lol do you have any t cut around? cause you could use some of that on cloth rubbing the cpu onto that one the chip was flat from the 600 to try and get a bit of a mirror shine but would be take a while possible, or a lot of t cut and you would have to give it a really good clean after to remove any chemicals from the t cut but i've seen that method used just the other day

failing that just walk into halford find the 1200 and yeah.. cant be that expensive? maybe some discount?

lol

KingZeddy · 23 Apr 2009 at 23:53

using T cut would be an interesting solution, but you would have to do it for weeks to get out the brush marks from using 600 paper

/Thom\ · 24 Apr 2009 at 11:24

lol true =p but yeah.. just a solution, admittedly when it was done around me the other day was from 1200 lol. OP just go buy a few sheets of sand paper! lol they're not that expensive

BeeP · 24 Apr 2009 at 11:38

Autosol

mrthingyx · 24 Apr 2009 at 12:08

*Sigh*

Why do people assume that for a surface to be flat, it needs to be shiny?

600grit will be fine for what you actually need to achieve.

BeeP · 24 Apr 2009 at 13:45

My autosol remark was a joke m8, I just know from machining Injection moulding tools that Autosol gives a mirror finish on steel etc.

cmndr_andi · 24 Apr 2009 at 15:39

I think 600 is good stuff to have, but you will be lapping for a looong time. I used 240 grit on my TRUE and that took atleast 5 hours to get it flat, then another hour moving from 320, 400, 600 and finally 1200 to get it flat and shiny. Turned out pretty well and is very cool - 52 degrees load at 3.2 on C2Q 9550

Sayso · 24 Apr 2009 at 21:03

dosnt need to be shiny to be flat, getting it flat is the main objective..if you use a good TIM it should cover any imperfections and give you as god temps as if it was totally "shiny"

cmndr_andi · 24 Apr 2009 at 21:24

I agree cooling is the same when dull or shiny, as long as its flat. That said tho, It took me 5 hours to make it flat - you bet i'm gonna spend the extra hour to make it shiny so I can take a sweet picture of it

/Thom\ · 29 Apr 2009 at 18:02

cmndr_andi said:
I think 600 is good stuff to have, but you will be lapping for a looong time. I used 240 grit on my TRUE and that took atleast 5 hours to get it flat, then another hour moving from 320, 400, 600 and finally 1200 to get it flat and shiny. Turned out pretty well and is very cool - 52 degrees load at 3.2 on C2Q 9550

i am sorry, but you were clearly doing something wrong

i used 600 i think and 1200 grits, and had the cpu lapped flat + shiny within an hour, how the hell did you manage to spend 5 hours on getting the cpu flat? :|

cmndr_andi · 29 Apr 2009 at 18:15

If you'd read my post or looked at the picture you will see I was lapping a 750g Thermalright Ultra Extreme Heatsink not a CPU.

mollymoo · 29 Apr 2009 at 19:46

Took me 3 1/2 hrs to lap my heat sink and about half an hour to lap my cpu .............. all nice n shiny though

/Thom\ · 29 Apr 2009 at 20:47

cmndr_andi said:
If you'd read my post or looked at the picture you will see I was lapping a 750g Thermalright Ultra Extreme Heatsink not a CPU.

i obviously did read your post and look at the picture, just not enough =P. I mean.. how could i have made my bad attempt at a reply to your post without reading it? it just doesn't make sense lol. I didn't have to lap my Zalman, it was perfectly lapped when i got it , and i often for get that other people have to lap their heat sinks, so i am sorry i did not pay your post enough attention to notice this, and made some assumptions along my way.

mollymoo said:
Took me 3 1/2 hrs to lap my heat sink and about half an hour to lap my cpu .............. all nice n shiny though

Though, this post would lean more towards me saying that you were doing something wrong to take that long. but then thats making the assumption that it was the same heat sink. either way, i'm not sure i care =o

cmndr_andi · 29 Apr 2009 at 20:52

Hehe, my response to that is that not all heatsinks are created equal, and unless there is some prize for speed lapping i'm happy with the way I do things thanks very much.

Anyhoo, 52 degrees load (q9550 @3.2) and barely audible, I guess the proof is in the pudding.