On Saturday 05 October 2013 14:08:18 andy pugh did opine:
> On 5 October 2013 17:46, andy pugh <[email protected]> wrote:
> > My Mill has an 80 speed gearboxes to give speeds from a slow 1000rpm
> > to a _really_ slow 45rpm.
>
> Err _8_ speed gearbox.
Either way Andy, this is the seed for me to see if I can figure out a way
to rig my lathes spindle speed PID lashup to compensate for a possible
switch in the backgear ratio, which with the OEM motor was rarely switched
from low gear because the OEM motor was way too puny to consider high speed
for anything but polishing the finished part.
When I put the bigger motor in, the jackshaft gave me about a 3/1
reduction, but its always bothered me that the PID tuning for low gear was
unstable in high gear. I have used low gear a time or two, but with the 3/1
in the jackshaft, its not very often so I am 'tuned' for high gear, and can
get to maybe 1800 revs that way. But the treadmill motor is doing 12 grand
or more then. Thank $DEITY its flywheel/fan is very well balanced, but
still, its an iron casting nearly 6" in diameter that could make some very
interesting shrapnel.
An even longer hal file in my future? Maybe. Thanks for the mental
tickle. Printed FFR.
Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Prerecorded for this time zone.
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
law-abiding citizens.
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