On 5/29/25 06:44, andrew beck wrote:
I have tapped up to about 18mm
And usually 450 rpm.
I can tap up to about 800 though.
Higher rpm overshoots the bottom of the hole so you have to account for
that a bit
This is a 7.5kw motor
my smaller mill is peaking at around 2,2kw, (supposed to be a 1hp pmdc
motor but I am abusing it to around 3hp) so I'm slower. figuring on a
6mm max tap for one stroke. If I need bigger, I have to peck the tap
about 1/4 rev at a time. The lathe can rigid tap too with the smoothing
effect of a vfd driving a 40 lb chuck from a home made encoder watching
the 60 tooth gear on the spindle. I write my own gcode so the peck tap
is just another loop.
On Thu, 29 May 2025, 17:32 John Dammeyer, <jo...@autoartisans.com> wrote:
From: andrew beck [mailto:andrewbeck0...@gmail.com]
I run a 1000ppr encoder normally on the CNC mills as they run up to 10 k
rpm and max count rates get a bit crazy over that.
On the CNC lathe 3000 rpm max I have a 2500ppr encoder.
Both option work perfectly with rigid tapping.
I have never used a floating tap holder ( just straight in a normal
collet.)
And tapped thousands of holes so it must be tapping perfectly.
Thanks Andrew. Quick question. What size taps for ridged tapping have you
run and what RPM?
Thanks
John
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Cheers, Gene Heskett, CET.
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