On Tue, 14 Dec 2010 17:26:03 -0500, Karl Townsend
wrote:

On Tue, 14 Dec 2010 14:06:10 -0500, "Joe AutoDrill"
wrote:

I run pretty conservative numbers to make sure my customers have reliability
and efficiency.

Generally, I run taps at 1/3 the drilling RPM and plan on needing 200% of
the HP requirement for drilling. ...Cut tap, HSS.

I use the following chart to estimate those numbers:

http://tinyurl.com/ToolSpeeds
or
http://www.multi-drill.com/drill-speed-chart.htm


Man, I have a radial arm drill and a heavy duty CNC mill and i only go
about 1/3 of these numbers. IMHO, a typical HSM ain't got a chance
with light equipment at these speeds. Keep in mind these numbers are
for production shops.

Just my 2 cents

Karl

Ill have to check them. I was running a radial arm drill yesterday, but
it only had a 3" bit in it.

Cinci with a 12' arm.....

Gunner

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