On Wed, 1 Sep 2010 10:17:32 -0700 (PDT), Jim Wilkins
wrote:

On Sep 1, 12:48*pm, Ignoramus4117
wrote:
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.

i

Parabolic drills work well.

jsw

Indeed. Probably the best for deep drilling aluminim. The long, wide
flutes really get rid of the aluminum, particuarly with a good
lubricating coolant.

Gunner


I am the Sword of my Family
and the Shield of my Nation.
If sent, I will crush everything you have built,
burn everything you love,
and kill every one of you.
(Hebrew quote)