Typically, I tell people who *need* to drill aluminum dry to run at about
70% of the RPm shown on my charts
(http://www.multi-drill.com/drill-speed-chart.htm).

In other words, a 1/2" hole in aluminum run dry would be run at around 1000
RPM rather than 1500 or so...

We are relatively conservative with our numbers because when it comes to
drilling, most people don't need CNC-type speed. ...So don't slam me for
being so slow and out of touch!

I'm wondering if there is a rule of thumb any of you follow for such
procedures?

Regards,
Joe Agro, Jr.
(800) 871-5022
01.908.542.0244
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V8013-R