LinuxCNC S-Curve Accelerations

Hello, 

Is it true that release 2.9 and above has S-curve implementation in it (As per Ai world). 

just need to add "SCURVE = true" in Trajectory Planner section...

If its true, what other paramaeters can be set in ini file..

thanks,

Hi Urvilsuthar,

That's likely an ai hallucination.
Or maybe Tormach is pushing their work, finally .

Most AI's lie. Grok gets it right

Does Linuxcnc support jerk limited motion?

As of the current date, March 28, 2025, LinuxCNC does not natively support jerk-limited motion in its mainline trajectory planner. Jerk-limited motion refers to controlling the rate of change of acceleration (jerk) to achieve smoother motion, reducing vibrations and mechanical stress on a CNC machine.

This is all I use now

Hello gentlmen,

excuse me but have anybody active project with in the moving stage and can share basic code configuration files please?

I am very interested in the this topic because I am working with Metronix ars servo on my table over profibus and finally I have finished with internal acceleration generator and I need to come with external refrence which should be genereted as I think from the component out of @Grotius workshop ...what and which should be declared for basic workbench setup

Really thank you for your experiences ... that SJOB from @Grotius is MAGIC

Regards... 

Hi Endian,

link

what and which should be declared for basic workbench setup
After install, you can run it. See link how to setup and run.

 

Basic setup means C6930 from beckhoff master with native ethercat drivers which control beckhoff el6730 profibus master in the equidistat mode which control Metronix ars servopacks single phase power which control different type of servo motors like custom feedback SZGH 2kw + resolver etc ... For configuration I typed a software which will generate .xml file automaticly which I need to publish.. 

But now I am thinking about multi ethercat master something like instances to communicate over more ports ... Because it has 2ms scan time and other stuff I am cycling in the 250us

For this purpose the servo drives ARS need external counted spline acceleration curve stuff.. and velocity command too..

Which I can not code myself because of lack of experiences, knowledge and time too...

Thanks for link, I will check them all

Thank for your job.. it is brilliant !

Grotius wrote:

Hi Endian,

link

what and which should be declared for basic workbench setup
After install, you can run it. See link how to setup and run.

 
 

Hello,


what does exactly meas "Additionally, the following libraries are required:" ... If I want to install the S-curve generator ... I will need both them install too?Additionally, the following libraries are required:

• S-curve
• Clothoid3D

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Hi Endian. 

The scurve planner uses :
libclothoid3d and libscurve
libclothoid3 depends on libceres.

the scurve planner is tpmod.so.
loaded by linuxcnc.

Do you only want to use libscurve to generate motion for servo motor?



 

I wonder if the scurve planner could not be renamed to say "stpmod.so" or even "grotius-tp.so" in the build process?
The trajectory planner is loaded in the ini file settings so the name can be anything.
Changing the name would allow it to coexist in a version of linuxcnc that also includes the default tpmod.so. This would be desirable long term.