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  • aeth
  • aeth
25 Jun 2025 12:11

Why does motion planning use linear interpolation instead of b-splines?

Category: General LinuxCNC Questions

It's a question that I've been asking myself for quite a while. Linear interpolation is quite limited in its accuracy as well as its ability to maintain constant velocity. Have there been any attempts to replace that with higher order polynomials / b-splines / NURBS etc? I saw the recent great achievement to implement s-curve acceleration (add a setting for jerk), but here I'm thinking more about directly improving the motion planner. I understand that this is significantly more resource intensive, but honestly, for a modern PC it should be trivial to compute.
  • djones@burketruck.com
  • djones@burketruck.com
25 Jun 2025 11:50
Replied by djones@burketruck.com on topic Probe Basic Not Remembering Current Pocket Number

Probe Basic Not Remembering Current Pocket Number

Category: QtPyVCP

I am still working on the servo load bars. In Dmitry's axis config for his VTC20, he has net trq5 nyx.0.servo-05.trq-fb => pyvcp.trq5 in nyx-6-pgui.hal (servo 05 is spindle in our VTC setups) so I was going to try to work with that. I just haven't tracked down nyx.0.servo-05.trq-fb yet to see if its a preconfigured input or if it has to be created.
  • MacKaye
  • MacKaye
25 Jun 2025 11:36
Replied by MacKaye on topic Weiler DZ26 Millturn Conversion

Weiler DZ26 Millturn Conversion

Category: Turning

Somehow i just lust my long winded reply to your suggestion...
short form: I would be happy to find some form of documentation to get that sserial port config done. .9serial and hostmot2 documentation don´t help me at all unforuntately

"sserial_port_0=0000000F" should open up channel 0-2 for 7i77 in mode 0 and 3 for 7i84U in Mode 0

no sserial device answers to

"show param hm2_5i25.0.sserial.port-0.device-count"

i am pretty much out of my depth setting up that smart serial connection
  • Aciera
  • Aciera's Avatar
25 Jun 2025 09:45 - 25 Jun 2025 09:50

Axis view options are not persistant between sessions. Any thoughts?

Category: AXIS

I'm not aware of  a 'UNITS' or 'DEFAULT_UNITS' key:
linuxcnc.org/docs/stable/html/config/ini-config.html

same for 'GEOMETRY_UNITS'

[edit]
But I guess those lines come from this:

chatted with chatgpt for a few hours

  • behai
  • behai
25 Jun 2025 06:09

Please help -- Mesa 7I96S 24VDC Contactor Wiring

Category: Driver Boards

Hi,

I have successfully tested this wiring out with LinuxCNC.

In the main .HAL file, the following lines were added:

[
net router-enable    <=   spindle.0.on
net router-enable    =>   hm2_7i96s.0.ssr.00.out-00
]

The command:

[
$ halcmd show pin | grep spindle
]

Lists spindle.0.on among other entries.

Then I used LinuxCNC to run this GCode (.ngc) file:

[
M3 S1000  ; Enable spindle
G4 P10    ; Wait 10 seconds
M5        ; Stop spindle
M2
]

It turns on the contactor coil, we will hear a click, then it gets the Dremel grinder to spins for 10 seconds, then it turn off the coil, we will hear a click again, the Dremel also stop running.

-- This Dremel grinder does not have no-start protection feature.

This is how I wire the contactor and the Dremel grinder:



Prior to trying out this contactor, all I have running is the X-Axis motor, so the HAL configuration is very basic.

Thank you and best regards,

...behai.


 
  • MaxEkb77
  • MaxEkb77's Avatar
25 Jun 2025 05:30
Replied by MaxEkb77 on topic Problems with Lichuan Ethercat servo drive

Problems with Lichuan Ethercat servo drive

Category: EtherCAT

Hi all.
LC10E - magnetic encoder 23bit.
Servo in standby mode - motor not powered, i see encoder position moving near +-10 counts - only at me have that strange ?
  • tivoi
  • tivoi's Avatar
25 Jun 2025 05:14
Spindle servo drive was created by tivoi

Spindle servo drive

Category: User Exchange

Input 220v 3 phase/ single phase  7.5kw
PG card ABZ rs422
Support high fequency 1333hz. index, analog speed control, pluse speed control, position control ( step/dir <> cw/ccw
price 549usd free ship to us and eu
contact This email address is being protected from spambots. You need JavaScript enabled to view it.




  • chrisfischer
  • chrisfischer
25 Jun 2025 04:52

Axis view options are not persistant between sessions. Any thoughts?

Category: AXIS

Awe man I got excited it would be that easy. Alas, no change.

Thanks for the idea!
  • unknown
  • unknown
25 Jun 2025 03:00
Replied by unknown on topic LC 2.9.4 Configuration - Unsupported Locale

LC 2.9.4 Configuration - Unsupported Locale

Category: PnCConf Wizard

forum.linuxcnc.org/9-installing-linuxcnc...only?start=10#320959

Just about ecevrything to do with the Rpi images can be found in this thread, there is also an index to that thread here
forum.linuxcnc.org/38-general-linuxcnc-q...official-images-only
  • electrosteam
  • electrosteam
25 Jun 2025 02:53
LC 2.9.4 Configuration - Unsupported Locale was created by electrosteam

LC 2.9.4 Configuration - Unsupported Locale

Category: PnCConf Wizard

RPi 4B 4GB, Mesa 7i96, 3-axis vertical mill.
Mill runs LC 2.9.2 with Axis or Gmoccapy just fine.

First install of fresh L2.9.4, using PnCConfig and selecting Gmoccapy.
Get the error message of "Unsupported locale" when selecting [Forward] on the X-axis set-up page.

Used the LC 2.9.4 menu-config to set locale.
I am in Sydney, so tried "en_AU.UTF-8 UTF-8", a couple of other obvious ones, and "All".
Still getting the error.

Tried selecting [Back], but still get error.

Cancelled out and started again, but selected Axis.
Still getting error.

But realized that errors are generated at the step calculation stage also.
Thought this was cleared when I hand entered the correct value.

John.
  • DMNZ
  • DMNZ
25 Jun 2025 02:35

How to design new driver for my own board

Category: Driver Boards

you can see here that even best fine tuned usb devices on RT kernel has a round trip close to 10ms
interfacinglinux.com/linux-compatible-audio-interfaces/
compared to stable 0.1-0.5ms with Ethernet or SPI
  • cmorley
  • cmorley
25 Jun 2025 02:32
Replied by cmorley on topic Qtdragon for lathe??

Qtdragon for lathe??

Category: Qtvcp

Excellent!
  • DMNZ
  • DMNZ
25 Jun 2025 02:20

How to design new driver for my own board

Category: Driver Boards

if you plan to use Orange PI why not just dedicate few pins and use SPI. RIO already has the driver and i believe works on other spartan 6 boards like a charm. you can use usb for firmware updates and non real time data (like pendant for example). usb has great speed but absolutely no guarantee time wise especially if your board will identify itself as vendor specific class. you can try to play with usb audio devices class, which seem to have better latency but you may still be disappointed after all that hard work you plan to do.
  • DMNZ
  • DMNZ
25 Jun 2025 02:01

Xilinx Zynq 7010 fpga crypto windfall boards

Category: Driver Boards

Well, the board has arrived and i think i know now why these are so cheap. I can see the signs of dust, discoloration and rework. Looks like these boards are taken from old equipment and refurbished. I will use it for my fpga learning experiments but would not recommend for any serious use.

I guess this closes the topic.
  • dunnitagain
  • dunnitagain
25 Jun 2025 00:23

Linuxcnc 2.4.5 with Ubuntu 10.04 , Terminated with Error!

Category: General LinuxCNC Questions

Thank You , I have had other things happening , ill try and work on it this weekend.
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