I need some help lapping my Blorb

[ZeroAquaduct]

I'm trying to lap my Blorb. I'm up to the point where the blue paint is gone. However, when I placed the Blorb on a glass surface, it's still a little rounded (convex). I read that the Blorb is cheaply made by Thermaltake and that the three pins that are used to bolt down the base usually warps the base.

Should I keep sanding until I get a complete flat surface? Or will the thermal compound be able to take care of it? I'm planning to use a mixture of ASII and AS epoxy. This Blorb is for my Siluro GF2 MX. Thanks!

[Wicked Klown]

you want a very smooth flat surface. and it`s a pain to get it.

[ZeroAquaduct]

I'll see if I can get it to 100% flat. I'm shedding off quite a bit of the base, would that affect the performance of the Blorb, since there's less of the heatsink?

[robertm]

Anytime you lap you tend to take more from around the edges. One mistake a lot of people make when lapping is applying force down on the item there lapping. lapping should use almost no downward force as this will tend to make you rock the item as you change directions.

To get the best surface use wet sanding. You need to get wet dry sandpaper though and it even takes longer but you can get mirror finishes with that method.

Only use wet once your down to a very flat and smooth surface.

[ZeroAquaduct]

Wow, it's very hard to get a 100% flat surface. I did some wet sanding and I was able to get it very flat, I'd say around 95% flat. The centre is all flat now; it's the edges around the circular base that's still kinda bent (curves up away from the chipset). It starts to curve about 0.5-1mm from the edge.

I think 95% will do, since if I sand anymore, I'll sand the entire base away. :D

BTW, how did you get the mirror finish? Does it matter? I finished it up using a 1500, but I still didn't get a mirror finish.

[robertm]

Uses the highest grit sand paper you can find I had some 2500 you run though it fast though. Check autoparts in the autobody sections you might find some higher grit paper there.

I test my lapping by picking up a 3lb lapped chunk copper metal I have at work using water tension. a drop of water and press the two together and I should be able to lift it an inch or so from the table.

Good luck it just takes time and strong arms :)

[mw521]

I lapped mine by first taking a large file to it and getting it flat ie: no paint then start your regular lapping procedure. This will take care of the harder screws that stick out and give you a good base to start on.:p