On 3/29/25 13:15, Dave Engvall wrote:
Hi Sam and Peter,
Clearly my googlefoo is lagging. Thanks for filling in the blanks.
Isa motherboards are still available; both used and new. New will run about
$200 plus processor. Used a lot less (maybe) and a gamble.
I still need to test what I have, it might still work but has set idle for
several years. Some wiring needs to be replaced and tested. I have new brushes
in the spindle motor. Still the more prudent route may be to go 5i25-7i77 and
’simply’ move over all the I/O and analog signals.
Stay tuned.
Dave
The 5i25 is a good basis, Its encoder inputs can track a 1000 line
encoder directly on the motor shaft of my GO704 at 3000 revs spindle
speed, nearly 21000 revs. The diff between our stuff is a 7i76 expander
card because my stuff all runs on steppers, no analog servo's, but some
steppers are closed loop stepper/servo's. That style needs no PID's as
they do EXACTLY what the TP tells them to do. Top speed is of course
determined by the stepper voltage, and Hanpose is making drivers good
for 90 to 120 volts. Those drivers, CL42 for nema-17's, CL57 for
nema-23's, similar for nema-34 and up, running on 72 volts will I
believe outrun a servo. They also regulate motor currents based on
detected error, so they run as cold as a true servo. I make my own
rotary axises, using a 5/1 worm drive and the 3nm nema-23, can run under
a degree (mostly backlash in the worm) error at 600+ rpm on 42 volts. If
they should lose home, the whole machine is stopped in around a
millisecond. Has yet to happen when running gcode.
Good to see you are making progress Dave.
On Mar 28, 2025, at 7:42 AM, Sam Sokolik <samco...@gmail.com> wrote:
It is still in the docs..
https://linuxcnc.org/docs/stable/html/drivers/servo-to-go.html
On Fri, Mar 28, 2025 at 9:25 AM Dave Engvall <dengv...@charter.net> wrote:
Is there any support for the stg card do I own an orphan?
Dave
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Cheers, Gene Heskett, CET.
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