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  • cmorley
  • cmorley
15 Feb 2025 18:08
Replied by cmorley on topic dragon.var writing variables QtDragon

dragon.var writing variables QtDragon

Category: General LinuxCNC Questions

I am not sure why STARTUP_GCODE doesn't work - an example subroutine would help me investigate.
Usually for this sort of thing a preference file entry would be used. Any reason that you must use gcode variables?
  • cakeslob
  • cakeslob
15 Feb 2025 17:06
Replied by cakeslob on topic Remora - Rpi Software Stepping Using External Microcontroller via SPI

Remora - Rpi Software Stepping Using External Microcontroller via SPI

Category: Computers and Hardware

is j3 the extruder or one of the rotary joints/axis?
  • tommylight
  • tommylight's Avatar
15 Feb 2025 16:28
Replied by tommylight on topic One laptop + several machines using Mesa cards.

One laptop + several machines using Mesa cards.

Category: Computers and Hardware

I do have several machines with multiple configs, meaning one machine has several configs, made things very easy for tube cutters as i set them as normal 3 axis machine and use a config for each diameter tube.
That way, everything is 2D so Inkscape is used for CAM and perimeter is used as width.
In daily use, this saves huge amounts of time.
  • tommylight
  • tommylight's Avatar
15 Feb 2025 16:22
Replied by tommylight on topic Mesa with Ethercad connection

Mesa with Ethercad connection

Category: Driver Boards

I have several multi ton machines controlled by Mesa boards, never had a single issue, ever, been many years in daily use, just have a look on this forum and that is not all of what i did using Mesa as i forget to take pictures/videos very often.
Example :
forum.linuxcnc.org/30-cnc-machines/31792...fit?start=140#321649
  • tommylight
  • tommylight's Avatar
15 Feb 2025 16:17
Replied by tommylight on topic Elumatec SBZ 130/01 retrofit

Elumatec SBZ 130/01 retrofit

Category: CNC Machines

Yes, if i recall correctly, that is one sensor for the toolchanger that tells the motor when to stop spinning, it also uses 4 more sensors in gray scale mode for counting the tools.
As for PLC, i never use them, nor do i plan to.
I use exclusively Mesa for everything, and no, i am not affiliate nor do i have any relations to them, their boards just work, 24/7 for years on end without a single issue ever, and their support is the best on planet earth, as you can find out on this topic/thread, i needed non standard firmware for the existing absolute encoders and got it from them the next day, Try that with any other company....
  • tommylight
  • tommylight's Avatar
15 Feb 2025 16:05
Replied by tommylight on topic Can't eek out that last bit of jitter

Can't eek out that last bit of jitter

Category: General LinuxCNC Questions

See the downloads page on how to install the RTAI kernel and RTAI LinuxCNC version, they should be much better for latency on older hardware.
Also, always use --show for latency histogram, in your screenshot you can see excursions on both sides of the base period plot.
  • tommy
  • tommy
15 Feb 2025 15:38 - 15 Feb 2025 15:43
Replied by tommy on topic Pico UPC + USC + PWM servo Amp For sale

Pico UPC + USC + PWM servo Amp For sale

Category: User Exchange

Adding:
4x DC servo KL34-180-90 + AVAGO encoder with line driver 

all components were in use on hobbyist CNC machine (router).

 

 
  • PCW
  • PCW's Avatar
15 Feb 2025 15:25
Replied by PCW on topic Mesa 7i76e, step dir, homing with index signal.

Mesa 7i76e, step dir, homing with index signal.

Category: Basic Configuration

This can be done with custom firmware
and some kind of daughter card on one of
the 7I76Es parallel expansion connectors

If the signals are 5V a daughter card may
not be needed but some protection from voltage
spikes like  220 ohm series resistors on the inputs
is advisable.

Another possibility is for me to add a software index pin for the stepgen/encoder
in LinuxCNC's driver so you could connect say a 7I76E field I/O pin to the software
index pin in hal.

This function could be built from hal components but it's a bit complex.

 
  • jairobbo
  • jairobbo
15 Feb 2025 15:23 - 15 Feb 2025 15:26
Replied by jairobbo on topic Remora - Rpi Software Stepping Using External Microcontroller via SPI

Remora - Rpi Software Stepping Using External Microcontroller via SPI

Category: Computers and Hardware

scotta thank you so much!

the challenges I face that are left are:

1) homing -> I tried wiring to GND and 3.3v but joint.0.home (maybe it's called different) is never TRUE, I tried using halcmd show pin for that while linuxcnc was running and also live testing the home axis.
[code]27  bit   OUT         FALSE  remora.input.00 ==> X-home   
27  bit   OUT         FALSE  remora.input.01 ==> Y-home   
27  bit   OUT         FALSE  remora.input.02 ==> Z-home   
27  bit   OUT         FALSE  remora.input.03 ==> A-home

[code]I think it's weird that all my inputs are listed as OUT....

2) maybe related maybe unrelated: my A axis (joint3) is continuing to have follow joint problems. I thought maybe the motor or the driver went bad, but I swapped both. I tried several stepgen_maxaccel settings and fooled around with other settings as well.

Of course I appreciate the help so far and yes it's close to working, I was already very happy to see my XYZ axes moving!!!! :)

 
[/code][/code]
  • Guytou
  • Guytou
15 Feb 2025 15:17
dragon.var writing variables QtDragon was created by Guytou

dragon.var writing variables QtDragon

Category: General LinuxCNC Questions

Hi,  I am trying to read and to write variables in dragon.var.  Purpose is to know the on/of status of a laser and a spindle (on or off).  I can read the values through MDI with a DEBUG message. I can also write through the MDI. So the 2 variables (#5381 & #5382) that I want to read and write are accessible.  However, I cannor achieve to set the values during initialisation of QtDragon. I tried to do this through a subroutine that is called in the INI file (STARTUP_GCODE = o<init_variables> call, but it doesn't work.  Any ideas how to solve this?
  • PCW
  • PCW's Avatar
15 Feb 2025 15:06
Replied by PCW on topic Error: undefined symbol: hm2_pktuart_setup_rx - while lading custom modbus.so

Error: undefined symbol: hm2_pktuart_setup_rx - while lading custom modbus.so

Category: Driver Boards

locate pktuart
 
should find it but if you have re installed recently the
locate database has probably not been updated
(its done periodically, usually scheduled late at night)

You can manually update the locate database with:

sudo updatedb

(this will take a while since is has to search the entire directory system)

 
  • PCW
  • PCW's Avatar
15 Feb 2025 14:49 - 15 Feb 2025 14:56
Replied by PCW on topic THC with Beckhoff EL5101 and THCAD2 => encoder signal loss

THC with Beckhoff EL5101 and THCAD2 => encoder signal loss

Category: Plasmac

Is this possibly a EL5101 bug or latency /communication issue?

Is the dropout always 10 ms? If so that more suggests a bug  or
communication/driver problems than electrical issues.
 
  • Aciera
  • Aciera's Avatar
15 Feb 2025 14:42
Replied by Aciera on topic Change acceleration on the fly?

Change acceleration on the fly?

Category: General LinuxCNC Questions

Yes, I did those chanes in gcode file, but that need to be fixed before we start the machining. Looking for run time solutions, like mentioned with the button push the accelaration should be change with the feed rate.


When I say 'change feed rate in real time' I don't mean the feed rate settings in the gcode I mean using a hal pin to change the current feed rate set in the gcode (ie feedrate override). You can slow it down to a stand still and even make it run backwards.
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