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Thc velocity low

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22 Sep 2021 16:12 #221354 by paulsao
Replied by paulsao on topic Thc velocity low
I attach an image with my z-axis values.  
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22 Sep 2021 18:39 #221360 by snowgoer540
Replied by snowgoer540 on topic Thc velocity low
If you are sure the voltages are correct, you could try increasing the P value in the THC settings area of the config tab from 10 to 20.  
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22 Sep 2021 19:18 - 22 Sep 2021 19:22 #221364 by PCW
Replied by PCW on topic Thc velocity low
The acceleration (750 mm/s^2) and 1200 mm/m  velocity
should allow ~0.5 mm minimum radius so that is not likely
the limiting factor.

(750 rather than 1500 mm/s^2 because only 1/2 the full acceleration is available to the THC)
Last edit: 22 Sep 2021 19:22 by PCW.

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22 Sep 2021 19:46 #221369 by paulsao
Replied by paulsao on topic Thc velocity low
Thanks for you explicatiion, Can the PID values ​​that I have in the joints affect something? In P I have 1000. 

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22 Sep 2021 21:34 #221379 by PCW
Replied by PCW on topic Thc velocity low
No, the stepgen PID values are correct.

The physical meaning of a P term of 1000
at a 1 ms servo thread rate is that any
stepgen accumulated position errors
are corrected at the next waypoint
(1 ms later)
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22 Sep 2021 22:47 - 22 Sep 2021 22:50 #221384 by paulsao
Replied by paulsao on topic Thc velocity low
The first cut is at a speed of 300mm / min and it was successfully made, the second is at 1200mm / min and it is not finished since the height control does not respond very quickly. . 
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Last edit: 22 Sep 2021 22:50 by paulsao.

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22 Sep 2021 23:15 #221385 by phillc54
Replied by phillc54 on topic Thc velocity low
The only thing I see is that plasmac.thc-feed-rate is 6000mm/min but the MAX_VEL in the joint is only 3000mm/min (50 x 60)

AXIS_Z MAX_VEL should be 100 (JOINT_# MAX_VEL * 2)

I don't know if that would cause an issue or not...
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23 Sep 2021 01:58 #221392 by PCW
Replied by PCW on topic Thc velocity low
If the Z velocity and voltage were plotted in halscope,
that might give a clue to where the bottle-neck is.

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23 Sep 2021 18:58 #221447 by paulsao
Replied by paulsao on topic Thc velocity low
Well guys after a night without sleep you see that the activation time of the thc was at 1.5s and it was too much for the slope of the metal that I wanted to cut and it did not allow to activate the thc I reduced it to 0.5 and it worked up to 2000 mm / min, thanks for his time I am still learning and calibrating my machine and reading a lot.
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23 Sep 2021 22:32 #221451 by tommylight
Replied by tommylight on topic Thc velocity low
Yeah i forgot that PlasmaC had 1.5 seconds of delay on the THC, i wonder who's idea was that?
-
Glad you figured it out.
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