Advanced Search

Andy released new RTAI debs for 2.9.3.

Has anyone tested them?

www.linuxcnc.org/dists/bookworm/2.9-rt/b...xcnc_2.9.3_amd64.deb

www.linuxcnc.org/dists/bookworm/base/bin...ai-amd64-2_amd64.deb

www.linuxcnc.org/dists/bookworm/base/bin...xcnc-delta_amd64.deb

+5V
 

If i give to j1:pin23 /ENA0 (50 pin header) 0V as input
what voltage will get to TB1:pin12 ENA0 as output?

There's this:


 

I can try to isolate that and I'll let you know.

I tried following the RCServoTest tutorial that uses pwmgen, and I'm not having any luck.  More searching and I'm thinking I should be using rcpwmgen? 

Can anyone point me in the direction of a tutorial or example how to use rcpwmgen?

What is the correct one?
Edit:
Is this the correct one?

Corrected topic subject

Not sure about the upper case but basically
the first statement uses ini file macro substitutions
for the card name and number while the second
uses the name (7i96s) and number (0) directly.
Both are equivalent after the hal file is processed
at startup.

I often use the macro substitutions as it means the hal files
are portable between card types (only need to change the card name
once in the ini file to change the card).

To use the macro substitution shown, your ini file would need  something like this:

[HMOT]
CARD0=hm2_7i96s.0



 

I wonder how much of the improvement is changing the driver and how much is 
just disabling EEE  and ASPM  (either of which would be fatal for network latency)

Maybe the old driver does not give you access to those settings...
 

what is the difference between the 2 lines  below?
net spindle-enable  =>  [HMOT](CARD0).SSR.00.OUT-05
net spindle-enable  =>  hm2_7i96.0.ssr.00.out-05

 I just tested both and both do the exact same thing so why although different do they both work?
I am still very much a noob when it comes to code so seeing both work and yet be different has me
scratching my head.

1. step_length+step_space = step_period
Maximum frequency = 1/ step_period
(so 500 KHz for 1000 ns step_length+1000 ns step_space)

2. They suggest 50% duty cycle. With the mesa hardware this would be true
only at the highest step rate, though this is probably not important.

3. Looks correct

4. Max linear velocity is after all reductions and ballscrew conversion to linear motion.

5. The shortest step_length on a 7I95T is 10 ns but you are limited to 1000 ns minimum by the drives
Note that it is better to leave some margin and not use the minimums.

6. If the speed was limited by the step timings, yes, 250 mm/S would be your maximum linear velocity.
at those microstep settings.
Practically, the maximum velocity will be much lower, as it will be limited by the step motors maximum
RPM which will be closer to 1500 RPM (= 50 mm/S) than the 7500 RPM that 250 mm/S requires.
This should allow you to increase the step_length and step_space to say 2000 ns so you have plenty of margin.

7. Really depends on the motor shaft/ballscrew/axis mass. A good guess to start is 5x the linear velocity.
If that is 50 mm/S, an accel of 250 mm/S^2 would be a good start. Too high will cause stalls, too low
will limit speed on curves.

 

Here is a photo of the back plate. For some reason I was not able to attach it to the previous message.
 

 Offtopic, but is there also a resolution (actually more like width*height) limitation in addition to the 1.6 Mb size limit informed when posting a message to the forums? When I cut the widht*height to half, I could post. But previously it would not allow me to post it even with an image size < 500 kB.

First of all, I would like to apologize for the long time without reply from my side.

Work and life has kept me busy...It would appear the design of the crowbar circuit is not good enough. The zener voltage "knee" is not sharp enough and component substitutions and tolerances almost means it has to be tuned to work as intended. I am considering updating the design based on the (last) TL431 design from  axotron.se/index_en.php?page=26
I would anyway prefer to have the ethernet jacks rotated 180° so I could use cables with 90° connectors to make it a bit more tidy.

I have worked a bit on the machine as well and started putting it back together. I am not in a situation where I almost need the electrical cabinet before proceeding. For that one I took some inspiration from RotarySMP and cut a section ~25 cm deep out of the cabinet. I will put the mill in a corner, and this will end up saving me a decent amount of space. At the same time, I patched up all of the old holes in it. And with some filler and beautiful Maho green, it starts looking decent again.




The electrical back plate also starts to be complete, at least for now. The planned wiring is done, but I still need two more SinCos interpolators, and sawing and cable channel covers to length. But regardless of that, the back plate can be installed to the electrical cabinet once that is fastened to the mill. Then external wiring and testing can start for real. I used orange terminal blocks to indicate that they have protection inside. This was a convenient possibility with the two level terminal blocks. For the solenoids, I soldered in diodes (1N4004) and for that gearbox motors I used varistors.
 

Also jetzt probier mal MDI: