TCP 5-axis kinematics

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8 years 6 months ago #108625 by jsskangas
Replied by jsskangas on topic TCP 5-axis kinematics
I did first run on Full 5-axis.

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8 years 6 months ago #108629 by andypugh
Replied by andypugh on topic TCP 5-axis kinematics
Nice!
Where do you get the CAM from?

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8 years 6 months ago #108638 by jsskangas
Replied by jsskangas on topic TCP 5-axis kinematics
I work as a CAM expert in company that provides Siemens PLM Products.
My work is to make (mainly coding) post processors and machine tool simulation models. (NC code simulation )

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8 years 6 months ago #108647 by andypugh
Replied by andypugh on topic TCP 5-axis kinematics

jsskangas wrote: I work as a CAM expert in company that provides Siemens PLM Products.
My work is to make (mainly coding) post processors and machine tool simulation models. (NC code simulation )


Ah! That's cheating :-)

It does mean that you are probably in a good position to say if LinuxCNC works "properly" in multi-axis mode. I understand that the blending of non-linear is a difficult problem and one not fully addressed even in the new trajectory planner.

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8 years 6 months ago #108648 by skunkworks
Replied by skunkworks on topic TCP 5-axis kinematics
Yes. Any motion involving rotary falls back to one segment look a head.

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8 years 6 months ago - 8 years 6 months ago #108666 by jsskangas
Replied by jsskangas on topic TCP 5-axis kinematics
I just got full 5-axis working.
That video was a second attempt on full 5-axis milling.
first attempt was that same roughing in half way.
At the moment I cant comment yet. I need to run whole impeller and finishing path to see results.

One thing I noticed, there was considerable amount of Jerk in movements.
I did set acceleration down to compensate that.
I'm running 1800 mm/s2, on my axis, for 5-axis work 700-900 max.
Only limiting factor is jerk. Whit S-curve acceleration I could go to "close" 1G.


What I can say is that Linuxcnc is maybe the most user friendly control system I have used.
That is my personal opinion.

But it is far from commercial systems, regarding trajectory planner.

What are done better in commercial control systems are kinematic support, 5-axis trajectory planner.
S curve accelerations ect..

5-axis trajectory planner or even 3 axis S-curve acceleration is not easy task to make.

S-curve acceleration / path smoothing would be my no. 1 to be developed in linuxcnc.
So that amount of smoothing and size of S-curve could controlled from G-code.
This way one could run smooth roughing paths and tight finishing paths.

Please do not take this as a fend for Linuxcnc, I like it and I will support it as best as i can,
Last edit: 8 years 6 months ago by jsskangas.

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