On Sun, 5 Nov 2017, Gene Heskett wrote:
2 things.
The recommended pid setup winds up like crazy, and takes 2 to 4
seconds to respond to a change in the spindle loading that slows it
down. Then it over speeds and takes 10 seconds to settle back to the
set speed. I've tried to add some Pgain, but on a velocity to velocity
setup thats not working. That uses FF0 and Igain, everything else is
zeroed.
First I would get FF0 set correctly (best RPM tracking with P,I,D all zero) If
this does not work at least reasonable well by itself, it shows that you do
not really have a velocity mode control (what hardware is driving you
spindle?)
If you can get reasonable tracking with just FF0 then proceed to adjust the I
term. If it take seconds for the integral term to have an effect, you have
_way_ too small an I term, try multiplying it by 10. You very likely will need
to set the integral bound to prevent windup. Note the using FF0 and I
alone should work for a velocity mode drive. if you have closer to a torque
mode drive, the tuning will be different
Some minus FF2 maybe? Got to be a way to stiffen the speed regulation
up, a lot.
2. when I put a 10mmx1.5 tap in, even pecking at it, 1/16th of a turn
per peck, its stalling the spindle motor at the bottom of the peck by
the time its got the makings of 2 threads started, so When I hear the
servo chirp, I help it back out of the hole, shut the cut down, and
finish the hole with a 22mm open end wrench across the flats of the
TTS toolholder, using the loosened in the R8 adapter TTS as a tap
holder to tease it into making enough threads to work. At least 3/4".
Its 22:45 local time, I'm bushed and one more hole to drill and tap
tomorrow.
Anybody know where I can find a 10 horse motor for a G0704? :) One the
z motor can still lift? (snirk)
Thanks Andy, you were as usual, right.
Cheers, Gene Heskett
And where can I src from here in the US, a decent quality, 10mm 1.5
pitch, solid carbide spiral machine tap? Ebay's search engine and the
sellers have no clue that there is a difference between HSS and carbide,
using both words to describe the same item, nor what the difference is
between a spiral tap and a spiral point. And neither do the sellers. :(
Thanks guys.
Cheers, Gene Heskett
--
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soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>
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Peter Wallace
Mesa Electronics
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