Lapping the Core

[cyberey66]

Kind of off topic, but not really. When you're done lapping if you want to make a good shim get some thin gasket foam slightly higher than the core and glue squares to each corner. Then sand each corner until each one is level with the core, i used a light and level heatink to test. Then you have a very accurate shim for resting the heatsink.

edit, I mean light, as in a light to see the gaps between heatsink and core, not light as an adjective for heatsink

 

[Colin]

I have lapped several of them with good results. 3C measured with an in-socket thermistor.

First you need to make sure the core is not convex. If it is, the odds are you will only make it worse. A flat (if there is such a thing) or concave core is a good candidate. You can use a razor blade to check the surface.

Lap in 20 second intervals with 2000 grit. Check your work with a 20 power loop every 20 seconds. Only lap until the etched lettering is gone. The result should be a polished sliver colored die. If you see copper, you loose! You may want to do your final polish with a fresh sheet of 2000 grit and your favorite premium thermal grease as the lube.

Disclaimer: I don’t recommend lapping unless you can afford to replace a damaged core. I will accept no responsibility for anyone’s mistakes if they follow this method.