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Change of vel ignored
« on: December 18, 2015, 09:45:09 PM »
Hello

Some moths ago I was wondering how to make some plasma cuts.
I designed the electronics for Z with a pic and 4 inductive sensors, and have cutted from cal 26 to 1 1/4"
The question now is about a change of velocity
The program (by sheetcam) sets a cutting velocity but I need to go faster when it doesn't cuts (g00)
but it goes at the first set velocity, ever.

N0100 M06 T14 F1400.0  (Plasma, 2 mm, 1400 V  1/4" esp)    <-- HERE IS THE CUTTING VEL
N0110 G00 Z15.8750
N0120 X0.0000 Y-4.0000
N0130 Z7.6750
N0140 M03
N0150 G01 Z4.6750
N0160 X151.5000
N0170 Y4.0000
N0180 X0.0000
N0190 M05
N0191 M06 T14 F10000       <--  HERE IS THE TRAVERSE VEL    WHICH IS IGNORED
N0200 G00 Z15.8750
N0210 X901.0000 Y-7.0000
N0220 Z7.6750
N0230 M03

Do somebody knows what to do?
Possible I have to omit the T14
It could happen that the microsteps of drivers be limiting the max vel., if there is not error in the previous code.

Thank you for your help
Luis J.

Offline BR549

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Re: Change of vel ignored
« Reply #1 on: December 19, 2015, 09:17:31 AM »
Your feed rate vel is set by the F word and the Gcode IS switching to G00 mode which switches to rapid feedrate. The Gcode IS correct.

Check your max vel setting in teh motor tuning section .

(;-) TP
Re: Change of vel ignored
« Reply #2 on: December 20, 2015, 05:34:25 PM »
Thank you very much. 
In fact, the microsteps are set to the maximum in order to make it more accurate, I will step down them and see what happens.

Re: Change of vel ignored
« Reply #3 on: December 22, 2015, 03:09:36 PM »
Thanks a lot.  Problem solved.  The max velocity in the config > motor tunning  was 1500, I increased to 3,000 and it worked to this velocity.  What could be the max velocity I could use safely for the stepmotors and without loosing steps?   Indeed they have raised about 55 celsius even without movement.  
Previously I configured the microsteps from 256 to 128 and the only change was that it slowed movement and the size moved become wrong at half of the real size.  I suppose I would have to double the rate of pulses per unit.  Am I right?  If I do it, would I have half of precision?

Offline BR549

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Re: Change of vel ignored
« Reply #4 on: December 22, 2015, 04:26:10 PM »
YOu will not gain much beyond a microstep of 10 according to Gecko a popular Stepper drive Manufactorer.

(;-) TP