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Messages - lfjill

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1
G-Code, CAD, and CAM discussions / strange velocity
« on: April 07, 2016, 01:22:53 PM »
I'm using a cnc table made by me with Mach3
After working well, It began with a problem: don't respect the F command so I set F350 and it was moving the head about 900 mm/minute.

Then, stopping the program, I introduced in the code a sentence as this:
M6 T3 F400
And started from here the program
The machine responded well to the command, moving the machine at the specified velocity.
But, without this, the machine didn't respected the original F command.

What could make that the Mach3 don't respect the F command?

N0010 (Filename: ConectorSuperior.tap)
N0020 (Post processor: Mach3 plasma.scpost)
N0030 (Date: 16/03/2016)
N0040 G21 (Units: Metric)
N0050 G53 G90 G91.1 G40
N0060 F1
N0070 S500
N0080 (Part: ConectorSuperior)
N0090 (Operation: Outside Offset, trazado, T3: Jet tool)
N0100 M06 T3 F350.0  (Jet tool)
N0110 G00 Z10.0000
N0120 X860.8263 Y199.3129
N0130 Z0.0000
N0140 M03
N0150 G02 X855.3957 Y199.3129 I-2.7153 J2.7153 F900.0
N0160 G01 X853.2744 Y201.4343
N0170 X921.1920 Y269.3519
N0180 G03 X921.1920 Y271.8267 I-1.2374 J1.2374
N0190 G01 X793.9128 Y399.1060
N0200 G03 X790.9253 Y397.8685 I-1.2374 J-1.2374
N0210 G01 Y5.0000
N0220 G03 X793.9128 Y3.7626 I1.7500 J0.0000
N0230 G01 X921.1920 Y131.0418
N0240 G03 X921.1920 Y133.5167 I-1.2374 J1.2374
N0250 G01 X855.3957 Y199.3129
N0260 M05
N0270 G00 Z10.0000
N0280 X992.1055
N0290 Z0.0000
N0300 M03
N0310 G02 X986.6749 Y199.3129 I-2.7153 J2.7153
N0320 G01 X984.5536 Y201.4343
N0330 X1052.4712 Y269.3519
N0340 G03 X1052.4712 Y271.8267 I-1.2374 J1.2374
N0350 G01 X925.1920 Y399.1060
N0360 G03 X922.2045 Y397.8685 I-1.2374 J-1.2374
N0370 G01 Y5.0000
N0380 G03 X925.1920 Y3.7626 I1.7500 J0.0000
N0390 G01 X1052.4712 Y131.0418
N0400 G03 X1052.4712 Y133.5167 I-1.2374 J1.2374
N0410 G01 X986.6749 Y199.3129
N0420 M05
etc
.
.
.

N1190 G00 Z10.0000
N1200 M05 M30

(The T3 had been used before at 900 mm/min, but even reloading the program was failing)

2
G-Code, CAD, and CAM discussions / Re: Change of vel ignored
« 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?


3
G-Code, CAD, and CAM discussions / Re: Change of vel ignored
« 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.


4
G-Code, CAD, and CAM discussions / 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.

5
General Mach Discussion / Re: sync failure
« on: December 10, 2014, 03:46:21 PM »
It worked!!!!!
So the problem was electromagnetic noise.
It has to be considerated I have a USB extention because the drivers are mounted in one axis structure in order to simplify cabling.   So the machine with mach3 need a long usb cable to reach the breakboard (3 m) wich will move in a range of 2 meters.   I wrapped the usb cable with 0.20 Euros of aluminium foil and then wrapped again with isolating tape.  (The seller of the card told me to find a blinded usb cable that I could't find in this town and costs about 25 Euros)  It works perfectly.  I will only fix some mechanical details and I will have the system operating.

Thank you very much for your interest and time.  I could send you a picture of the system later if you want.

Some persons use "sincerely" to finish a letter,   What would be right for you?
Luis Jimenez Illescas

6
General Mach Discussion / Re: sync failure
« on: December 10, 2014, 11:20:30 AM »
I have tryed with another computer and another operating system (win 7, the first had win 8) and do the same.  I'm covering the usb cable with aluminium foil connected to mass supposing the problem is electromagnetic noise, I'll see if this works today. 

 

7
General Mach Discussion / Re: sync failure
« on: December 09, 2014, 02:05:50 AM »
Hood
The option you told me about windows controlling the energy of usb is not set.
It worked for a while, then it fails sistematically showing the message "External movement is disconnected".  I reset the card disconnecting the usb cable, so, when I reconnect it seems to work, but in about 3 seconds the message comes again.  Even the keyboard (usb) fails retarding the response to show the letters typed.  It makes me think is something related to the usb port.   The computer is a cheap Lenovo but it is new.  It has 4 usb ports, 2 for keyborard and mouse, the third is used with the usb-cnc card, the fourth is empty,   I calibrated the two axis, then did some movements with G codes for both axis, but since the last fail I can't make it work.  The other hint is that the jog function doesn't work.  In fact, the fail began when I tryed to move the system with arrow keys.   Could it be a tunning fail?  (Do the velocity and acceleration of motor tunning affects the movement of programmed feedrate or only the jogging movements?)  I'm separating other cables from the usb cable to limit induction.   Maybe I have to put a mass connected conductive protection to this cable.   
The other option is that the breakboard be failing but  Why it has worked alternating with fails?.
This last card interact with another circuit card for Z control.  I will contrast to know if it could be origin of fails, although it seems not to be the cause.
Thank you for your help.
Luis J.




8
General Mach Discussion / sync failure
« on: December 05, 2014, 10:59:15 PM »
The system was working well without charge.  Now with the weight of a 2.20 x 1.2 meters (although it is a low friction system you can move with one finger), frequently stops at the begining of a movement (jog or g1) saying that external movement is disconnected, and some times saying that Sync has failed.   Disconnecting the usb card and reconecting let me the system working but something that worries me is that at the beginning I moved the system with few problems but it is increasing the sensibility of the system giving each time more frequently the sync failure.   

The one who sold me the equipment told me to increase the steps per unit (5.814 steps per mm), but this is my tested calibration so one meter movement is acomplished with less than .5 mm of difference.    i would try changes with velocity or acceleration (about 1500 mm/min and 500 mm/s2) .   Well, I could use the first level of microsteps on drivers and set the steps per mm to double. loosing in max velocity, I think. 

Do somebody with more experience would like to give me some advice?

Luis J

9
General Mach Discussion / Re: card recognition
« on: December 05, 2014, 01:21:38 PM »
Is it a way to avoid being choosing the card each time the program starts and that it continue working well?

10
General Mach Discussion / Re: card recognition
« on: December 05, 2014, 01:20:17 PM »
Hood

I verified the plugins folder to get the surprise that it was blank.  Then remembered that sometime I recovered the machine to a previous point respect the instalation of it some weeks ago.   

I installed it and it seem not to have any problem.

Thank you very much. 
Luis J

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