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Don't know what Version you are running but the toolpath preview does not 'wrap' around by default. There is a somewhat experimental setting for the [DISPLAY] GEOMETRY, so maybe tryThere are some caveats to this, see point 11 below:

 

linuxcnc.org/docs/html/config/ini-config...#sub:ini:sec:display

I have added rotary axis (workpiece rotates) to my 5-axis machine (BC head). I created separate config, as I want to run it as an "ordinary 3-axis" machine with 4th axis. So, configuration is changed in the way that all axis are homing but then after I use only XYZ and rotary B (as it is parallel to Y).
Machine works OK, only thing that is causing me problem now is preview of toolpath as it is not wrapped around Y.

Here is how it is programmed:
https://i.ibb.co/RYt6Vfc/ROTAR-CAM.jpg"

And how it is displayed:
https://i.ibb.co/hDnfNkF/ROTARY-DISPLAY.jpg"

Sections from my ini: 

That marking thing seems pretty nice, you think a Hypertherm 85 can do that? I would love to have a fully rotating robotic arm for the torch. Though for now I'm going to stick with a fixed manual angle for the torch.

Is there something I can do in Linuxcnc to have it "automatically" compensate for the angled offset?

you need to buy something like this.
 

then you take it apart and find out how its wired.
Usually the side button enables the MPG encoder - for safety.

and then you have to connect all wires to your mesa card or whatever interface are you using.
and make hal file for it:
linuxcnc.org/docs/html/examples/mpg.html
 

  cnc@cnc:~$ uname -a
Linux cnc 6.8.0-48-generic #48-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep 27 14:04:52 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
cnc@cnc:~$ linuxcnc
LINUXCNC - 2.10.0~pre0
cnc@cnc:~$ sudo chrt 99 ping -i .001 -q -c 20000 10.10.10.10
[sudo] password for cnc:    
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.

--- 10.10.10.10 ping statistics ---
20000 packets transmitted, 20000 received, 0% packet loss, time 20034ms
rtt min/avg/max/mdev = 0.047/0.050/1.014/0.007 ms

cnc@cnc:~$ latency-histogram --nobase --sbinsize 1000







 

Hi.

I do have a 7i43 laying around and want to use it with a thinkcenter p90 (good latency) without a parallel port.

So is there a good choice for a current pci to epp card?
The suggested ones are hard to get nowadays.

Best regards
Julian

Cant do this anymore bye all wrote:

First of all, my deepest deepest sympathies,sorry to hear you live in Melbourne, the only good thing Victoria has to other is Philip Island and the roads, airports and docks that lead out of the state.

Why aren't you using the premade image for your RPi ?

The links are on the Linuxcnc home page under downloads.
 

Good evening cornholio,

Thank you for your reply and suggestions.

I love Melbourne, except the crazy weather I have spent more than 2/3 of my life in Melbourne.

So after about 6 failed attempts ha ha ha... I found this official instructions: The Linux kernel

And I used one of the 64 bit images offered by the Raspberry Pi imager software to get my initial OS with Desktop.

Then from the instructions above, I picked out the appropriate bits to apply.

I finally succeeded:



Then, I also use a Windows utility named "Win32 Disk Imager - 1.0" to take an image of the SD card. And restore the image to another new card, I am able to boot from this new card also. Now I have an entire back up of the original card, if both cards fail at the same time, I am still covered.

Originally, I used the native dd tool to do the image backup, I could restore the image also, but it refuses to boot.

Currently, I only have a "Nema 23 Closed Loop Stepper Motor 3Nm (424.83oz.in)" and the CL57T-V41 driver.

I am learning by trying to program it using Python... I am having trouble getting it to work properly as a closed loop motor. I can get it to work as an open loop motor, we just switch on the the 6th dip switch SW6.

Thank you and best regards,

...behai.


 

what about the availability? i haven't been active here for a long time. 2 years ago the 7i76e was not available, currently it is not available either. did it ever come back? or should i better use another card? i already have some 7i76s in use and would like to use the same hardware on all machines...

wie ist das mit den 7i76? kommen die irgendwann wieder bei Mesa, oder sollte man auf etwas anderes wechseln?

i use this sensor to check the compressor pressure,
but you need an analog input for that:

www.amazon.de/gp/product/B07YKZ773Z

I would not expect the input step frequency of the driver (ie the 250kHz) to depend on the microstep or the output current setting.

Max RPM for given torque and micro stepping will depend on many variables (driver-, motor-, load-characteristics) and generally I would be rather weary of specs I'm given for cheap motors and drivers to begin with.

[edit]
I presume you are aware of the rather terrible speed/torque characteristics of a stepper motor. You might want to ask the supplier of your particular motor for a chart. Also max RPM will depend highly on the voltage you run your motors at.

 Another question: I am running the tang 9k with ethernet. What happens if the ethernet connections drops during a move. Will the motors just stop?

 

yes, if the connection is broken, all systems goes into eStop, enable pins goes low and no steps will generated anymore

 

twopass: Error in file /usr/share/linuxcnc/hallib/lathe.hal:
addf failed

Looks like you are loading 'lathe.hal' and there is a conflict with a component that was already added in another hal file.

Copy/pasting entire hal and ini files between configs is rarely a good idea. I would suggest you only copy/paste lines you really need.

For my application I need to drive a stepper motor at 60RPM with 2.5Nm of torque. I have chosen a stepper motor with a maximum allowable torque of 3Nm and a current rating of 0.6A per phase. The stepper motor is aNEMA 16 stepper motor with a 14:1 planetary gearbox so the step angle is 0.131 degrees.

My question is how do I calculate at what RPM the 5-DRV8825 stepper motor driver can drive the stepper motor?

I have read the TI datasheet for the 5-DRV8825 and it says the maximum step frequency is 250kHz, which I am assuming is for the highest microstepping resolution of 1/32 and a maximum driver output current of 2.5A.

Is there a reference table or simple formula that I can use to determine the maximum step frequency at lower microstepping resolutions and lower driver output currents?

Is the relationship between microstepping and torque linear? From what I understand, microstepping reduces torque?[/url]

what is the result of running

 sudo chrt 99 ping -i .001 -q 192.168.1.121 -c 50000

(the times are important)