On 9/23/23 19:11, andy pugh wrote:
On Sat, 23 Sept 2023 at 22:42, John Dammeyer <jo...@autoartisans.com> wrote:
Andy,
Just curious since we have the same harmonic drive and STMBL for the 4th axis
what max velocity and acceleration are you using.
I just checked, and the numbers are very modest. 100 deg/sec and 250
deg/sec accel. But the TP will always hit the programmed endpoints
regardless of accel settings, as it calculates within them.
I don't see the issue that Gene reports because I never home the
rotary. There is no point as I have no indexed workholding and there
is no need for soft limits.
If I need to align a part, I do it in the usual ways, with indicators
and probes, and then touch-off for alignment.
There is another advantage to homing it. Once homed, its much more
responsive, before homing its speed and accel are very lethargic,
limited to about 1 rpm and 1/4 turn to get to speed or to get stopped.
Homed its good to 40 rpm, and a fat 5 degrees to get stopped from 40
rpm=864000 in the VEL display. With 45 volts available, and a about 3.3
amps, the controller simply does not accept a no from the motor. I don't
yet have the alarm output hooked up but that's simultaneous with
powering down the motor and that has not yet occurred. I have 2 of these
on the Sheldon, and 2 of these on the 6040. The stock, same sized motor
ob the 6040 Z could not lift the new spindle motor at 20 ipm, The same
length of 3 phase motor jerks it around at 60 ipm. And I do mean jerks.
Its downright violent, yet totally precise. There is a huge diff in what
you can do with a motor between a 24 volt supply and a 48 turned down to
45. And hanpose has clone drivers with 90 to 110 volt supply ratings.
They are a bit proud of them though,
Take care, stay well and thank you Andy.
Cheers, Gene Heskett.
--
"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
Genes Web page <http://geneslinuxbox.net:6309/>
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
