On 2/22/25 18:29, Dave Engvall wrote:
There is a method to my madness, to wit I really want to know how good, or bad
the tinyG is. Older version of the emc interp but a much faster cycle time.
Glass scales are problematic for velocity control but rather good for position.
Servos on that machine with good encoders on the ball screw were much better at
velocity control, roll that in with a glass scale for position and you have the
best of both worlds.
I've had very good results on the one machine I have converted to closed
loop stepper/servo's. Totally doing away with the PID's. Feedback is
from the TP that drives that axis, the stepper/servo's have their own
PID's. My sheldon rapids are 2x faster, and quite a bit more accurate.
The TP outputs good code. These motors stay w/in a count of error And it
makes beautiful metal. Well within the thousandths I wrote the code to
do. No ticklish PID tuning ever, no PID's to function as rubber bands,
so what the TP spits out is exactly what the motor does.
On Feb 20, 2025, at 1:41 AM, Todd Zuercher <tzuercher1...@gmail.com> wrote:
If they are equidistant wouldn't simply use them the same as an ordinary
encoder index signed?
On Thu, Feb 20, 2025, 4:09 AM Andy Pugh <bodge...@gmail.com> wrote:
On 19 Feb 2025, at 17:15, Dave Engvall <dengv...@charter.net> wrote:
I think both have R marks at 50 mm intervals.
Seems logical?
There are systems where the index marks are at varying distances from each
other such that you know exactly where you are after seeing two marks.
There was discussion of this on the forum, which resulted in the homing
process being modularised, (HOMEMOD)
I don’t recall if we saw a suitable HOMEMOD module for this style of scale
in that thread.
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
