I drill 1.5mm holes all the time to 3cm depth, no biggie
use tapping oil, clear the cuttings before they build up
use AS2 or such
you will need liquid N to get enough of a differential
ck your BSs for the wire spec, should be ok
but why do this ?
just get a skived (sp ?) finned hsf and crosscut the fins to your liking
-> will be a LOT more effective
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