>Expanding on those, any heatsink you buy will not
be flat enough without machining, ideally with a large diameter
'fly' cutter. You are also looking for a good surface finish with
machining ridges barely detectable with a fingernail. As well as
flat (50um or .001" over the module area) clean is important.<
Not sure that I would agree about a fly cutter. Better than nothing, but I
a horizontal milling cutter. Alternatively, a face-and-end milling cutter.
A large slot drill
might give a good enough finish.
Another good way would be to use a shaping machine.
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