On 07/21/2020 12:43 PM, Matthew Herd wrote:
When I installed the spindle encoder, I used a shaft at the top of the head.
Due to my failure to investigate more fully, it turns out that it’s geared 1:1
with the spindle (but is not a part of the spindle). So when I go into
backgear, the encoder reads opposite direction and at a different ratio equal
to the backgear ratio (whatever that is, I’ve never bothered to determine it).
Fine for running a face mill or fly cutter, but not usable for rigid tapping
without some HAL to reverse direction and compensate for the ratio change when
in backgear). Also, I’ve never gotten automatic spindle speed set up since I
manually operate the vari-speed drive via push buttons on the head (HAL
operates the air valves for me). I also have a +/-10V DAC board to control VFD
frequency, but have never set that up either. I’m hoping to get rigid tapping
working without solving some of these other issues, but if that’s the way it’s
got to be, then so be it.
On Jul 21, 2020, at 1:27 PM, andy pugh <[email protected]> wrote:
On Tue, 21 Jul 2020 at 18:16, Matthew Herd <[email protected]> wrote:
Thanks for the insights. I suspected something along these lines, even if I
might have other problems with noise. I can confirm, the spindle stops way too
slowly and definitely more than 10 revolutions pass before stopping. Long
story short, I can’t readily run the machine in back gear
I think that's a story cut too short. Why can't you run the machine in
back-gear? I really wouldn't anticipate rigid tapping being done
without it.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912
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