"Ignoramus4117" wrote in message
...
I was making something on the CNC mill last night. It is a little
block that I would clamp to the quill of the mill, so that I would
attach the Loc-Line coolant line to the quill. That way the coolant
would follow the cutting tool as the quill is raised or lowered.

Anyway, as part of that, I had to drill a deep hole (comparatively). I
used a peck drilling cycle and it worked, but took way too long, with
withdrawal of the tool and lowering it down, etc.

So I wanted to double check what is the recommended procedure for deep
drilling aluminum.

My feeling is that at the given RPM of 2400, I should have used a much
more aggressive feed rate than I used.

As a side note: If an exact precisely round hole is not absolutely required
I've found that often it seems to work faster to use a slightly smaller end
mill and make a round pocket rather than to "drill" a hole.