On Wed, 15 Dec 2010 22:14:32 -0600, Ignoramus22945
wrote:

On 2010-12-16, wrote:
A Fanuc Robodrill (CAT 40 VMC) will peck tap 1/4-20 UNC holes at 10,000 RPM.
That's not just me.
Your mileage won't vary.

I don't doubt that at all...I am, however, using a fairly old Hurco
that couldn't spin that fast with a bullet at the set-up dudes
head....that's me, by the way.

And the reason for the 2500 speed is that that is all the faster the
head is rated at. I have a smaller one that I use for taps #10 and
under that will take up to 4500.

At 10,000 RPM, a 20 TPI tap would travel 8.33 inches per second.

At 2,500 RPM, 2.08 inches per second.

i

Yea, these production guys live in a whole 'nuther world.

All my CNC tapping is at 100 RPM and that's plenty fast. For the one
of jobs I do increasing tap speed from 100 to 10,000 RPM would save a
couple minutes out of my day. And maybe not that, I use machine run
time to set up the next op or clean the shop. Or if its a long
program, start making parts on another machine.

Anyway, if you can do something else while your machine runs; speed is
not an issue for us HSM types. Now breaking a tap in a part IS.

Again, just my two cents. I go slow and try real hard not to **** up
and break ****. Takes less effort in the long run.

Karl