This may sound somewhat off topic, but it pertains explicitly to this block, so I'm wondering what some thoughts are on this:
Concerning the drill tip used to do this block, I am considering adding half-sphere shaped dimples (with a ball mill) into the base of my next block. Also, by sharpening the drill (for home-made drilled rotor designs) to a very flat cone vs. a very sharp cone, different geometrically shaped "dimples" are created in the base.
Thoughts on sharpening the drill or using a ball mill to maximize surface area/heat transfer/turbulence and also minimize dead spots (water sitting in the dimples and not moving)?
Or does this even matter at all?
Other comments - I agree with bigben, just leave copper where he marked the blue dead spot.
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