According to Ecnerwal :
In article . net,
Bill Schwab wrote:

This is definitely small volume - one for now, a handful at a time
later. The surface is a little rough for good layout, and I still
cringe over the thought of my previous work on these panels.

Also look into short, stiff drills - all the metalwork suppliers have
them, they are less prone to wandering than longer drills if your rough
surface makes good punch marks a problem, or otherwise messes with good
drilling.

They are usually listed under "Screw Machine Length drills".

While you are at it -- look for split point ones -- which do a
better job of cutting without wandering. Or perhaps (for mild aluminum)
the drill bits which are made for wood -- a sharp center spur to feel
for the center punch mark, flat tips, with ears at the OD, to cut
through the edge before drilling through the bulk, resulting in cleaner
holes with less burrs.

And upgrade the light on the drill press (I have no idea what
you have now, but I do know that more light is better as far as really
seeing what you are doing).

Amen!

Enjoy,
DoN.

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