Hello
Can any GUI follow the ToolPoint?
Like: moving camera to keep ToolPoint centered in view port?
( or some gcoe/mcode trick to refocus the view port to 'here')
Thx TomP
On 5/16/25 14:10, gene heskett wrote:
On 5/16/25 11:32, Leonardo Marsaglia wrote:
Hi guys, hope you're doing well!
I'm pretty much successfully using external offsets for some of the
parts
we manufacture on the lathe.
But today, while the spindle was turning doing an eccentric I got a
following error at the moment I went from MDI to Manual control. I'm
using
servo motors but with mesa stepgen in velocity mode with it's
internal PID.
I guess this is a configuration problem.
Could also be hdwe. I, sevreral years ago, converted my Sheldon to be
driven the then new 3phase closed loop stepper/servo's. Bare in mind
also that my controller is not a wintel box, but is an rpi4b. The
individual controller in these has a decoder that is fed from an
encoder on the rear of the motor, putting the PID's in linuxcnc out of
a job because the PID is in the controller, giving truly instant
control, so my stepgens are driven directly from the trajectory
planner and there is no feedback to linuxcnc. That change plus around
45 volts to the controller makes the motor control at least 2x faster
than pure steppers. Because the error signal also instantly controls
the motor current, feeding the motor no more than it takes to null the
error, the motors run 70C cooler and the workpiece shows nothing but a
mirror finish.
I am now using this same motor tech several other places, and am
slowly replacing the steppers with these stepper/servo's, including in
my 3d printers. The printers run 10x faster than OOTB, with much
improved accuracy. Loss of a step is totally historical, it just
doesn't happen. Ever. If the error is that big, the motor current
rises to move he motor to reduce the error. Hanpose drivers can work
with up to 90 volts for nema 17 motors, pulling the motor into
position in microseconds but that overdrive is so short. there is not
any heating to dangerous levels. I made some rotary axis things I
carve screws with, a 3NM motor driving a 5/1 worm, 500 revs output
speed is 2500 revs on a nema 23 motor, 2 hours of runtime per hard
maple screw, the motor is warm but not burn you hand hot.
But a warning, only motors with optical encoders. the smaller "42C"
motors have a hall effect encoder, which can be just as accurate when
stopped but take far longer to do the AD conversions, so they only
move AFTER that AD conversion is complete, rendering what should be
slow smooth motions as sawtooth shaped motions and parts printed will
have shingles superimposed on the finish. Trust me you do NOT want that.
I'm using LCNC PRE 2.8 version on this lathe because it works. But I
suspect this is a config problem more than a bug.
Thanks a lot!
Check your feedback paths, velocity and position modes are conflicting
critters.
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
.
Cheers, Gene Heskett, CET.
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
