c2 smooth velocity profile

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09 Nov 2018 11:18 #120323 by rmu
Replied by rmu on topic c2 smooth velocity profile
I'm not sure how I can help. If you are comfortable running self-built master you could just checkout my branch from github and play around with it. Please keep in mind that this branch does NOT change the trajectory, it is only manipulating accelerations.

Trying different trajectory models is a whole new can of worms and IMHO best POCed and developed outside of linuxcnc. I personally like scipy for this kind of stuff.

I can't really help with git or running development branches, but these things are covered elsewhere.

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10 Dec 2018 15:33 #122142 by TiEr
Replied by TiEr on topic c2 smooth velocity profile
Hi rmu,

I appreciate your work. I think linuxcnc will benefit greatly with this new feature.

Do you have any news?

Greetings.

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26 May 2020 02:44 #168929 by xzls
Replied by xzls on topic c2 smooth velocity profile
hello any news of this job?

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08 Aug 2020 20:13 #177709 by grijalvap
github.com/synthetos/TinyG/wiki/Jerk-Con...led-Motion-Explained

I'm curios about this project they have jerk controlled motion.
can we learn about it and implement in Linuxcnc?

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13 Aug 2020 09:08 #178090 by rmu
Replied by rmu on topic c2 smooth velocity profile
The tinyG 6th order bezier curves inspired me to the code in the branch github.com/rmu75/linuxcnc/tree/rs_6otp .

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13 Aug 2020 10:57 #178093 by rodw
Replied by rodw on topic c2 smooth velocity profile
I cloned your repo but I fear it will be while before I can try it..

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13 Aug 2020 14:41 #178106 by rmu
Replied by rmu on topic c2 smooth velocity profile
Just a warning, it does exceed acceleration limits while it should not, and the linuxcnc version it is based on is outdated. Do not run on something that moves.

I didn't pay attention and upgraded all my machines to ubuntu 20.04, now I'm a bit in a pickle regarding linuxcnc development... probably will need to setup a VM with debian buster.

If somebody wants to look at it, I think the first thing to do would be to rebase it onto recent master and look for acceleration excursions in chips.ngc. On the "theoretical" side, jogging (should be easy) and feed override (probably some tedious math involved) need to be figured out.

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13 Aug 2020 15:15 #178109 by tommylight

rmu wrote: I didn't pay attention and upgraded all my machines to ubuntu 20.04, now I'm a bit in a pickle regarding linuxcnc development... probably will need to setup a VM with debian buster.

forum.linuxcnc.org/9-installing-linuxcnc...-nearly-easy-install
This should work for Ubuntu 20.04 also, might want to give it a try.

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13 Aug 2020 15:21 #178110 by cmorley
Replied by cmorley on topic c2 smooth velocity profile
Need Sam on this - he loves testing this stuff!
The following user(s) said Thank You: rodw

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13 Aug 2020 20:18 #178132 by rodw
Replied by rodw on topic c2 smooth velocity profile

rmu wrote: Just a warning, it does exceed acceleration limits while it should not, and the linuxcnc version it is based on is outdated. Do not run on something that moves..


I had thought it might be possible to do something similar to the way external offsets is managed. That is allocate a portion of max acceleration (say 20%) to the s curve which reduces the machine's acceleration to a lower limit (80%). Maybe that override can be calculated?

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