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Seriously, what is the correct way to drill a 2" deep hole into copper? Drill press, of course, but what cutting oil/ technique?
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copious volumes of coolant and patience, I use CRC/WD40 when drilling deep holes in copper, you need to pull the drill out regularly to clear all the swarf off(depending on what size drill bit your using.
I often have the work peice securley clamped to the drill plate and use one hand to feed the bit in and the other with the can of wd40 spraying into the hole as I drill.
oh the drill needs to be correctly sharpened too.