Messages

1

Forum suggestions and report forum problems. / Re: crash at Exit

« on: January 09, 2014, 08:57:04 AM »

sorry about wrong place
i means i've no problem during running a job and when it finishes and i close mach, a window reports an error occurred (in fact mach3 doesn't exit properly)and i lose maintenance hours data.
this happens for sessions which takes more than hour and so

2

Forum suggestions and report forum problems. / crash at Exit

« on: January 09, 2014, 01:13:05 AM »

hi i've ver3.043.066 running a laser, it does perfect but at exiting the mach crashs, no matter no problem just maintenance hours will be lost (essential for my job) , i save these at end of each session manual.
are there others with the same problem?

3

General Mach Discussion / Re: delay in PWM pulse (LaserMode)

« on: January 24, 2013, 12:48:24 PM »

hi tweakie and thanks for ur graph
that shows non linear relation with P and i, in other pages i've found that power and feed have not linear relation for cut a certain width of materials
in other hand mach changes DC of pwm linear to feed rate, so this can explain the problem.
to overcome that i should do an internal table (in micro memory) to translate DC, which may this table be vary for different materials, so long project!!
i'll do that, as soon as i have enaugh time.
but this days i have some orders and busy , also have very bad EMI interference caused by laser tube
some times when triggering laser , computer or microcontrollers crashes. obviously caused by elecromagnetic field of spark in tube
i've grounded all electronics in single earth point, metal case for micros and drivers wich the case is grounded too, also laser power supply case and computer case
i finally think about wrapping tube in some aluminum foils   or even dig another earth hole in the yard especial for laser psu
did u have those problems too?

4

General Mach Discussion / Re: delay in PWM pulse (LaserMode)

« on: January 20, 2013, 02:41:59 AM »

i done it,set minimum DC (in micro) 10% and for jobs with S command less than 10(maximum S=100,maximum power) it works fine
but with big S (for example90)the problem exist again, i have very shallow cut at 10mm of start then the depth changes to desired amount it next milimeters.
so there should be a way to rise DC much more faster than the Feedrate, i've not seen such in mach .
where i can find some diagrams about out power of a co2 laser by current? ( it shouldn't be linear, and it will be usefull to program micro to solve the pro.)

5

General Mach Discussion / Re: PWM signal not showing correctly

« on: January 19, 2013, 12:41:33 PM »

hi tweakie
sorry for that
i didn't note to whole pages!!

6

General Mach Discussion / Re: PWM signal not showing correctly

« on: January 18, 2013, 12:56:34 PM »

hi
using z axis to control automatically a pot will be great (if a linear one selected,coding will be much easier)
but in real world,whould this be enaugh fast ? if not u'll have a spot in start/stop of every pass
another issue : how long can a pot last at this job? (it is mechanical and not designed for such cond)

7

G-Code, CAD, and CAM discussions / Re: need to repeat program

« on: January 18, 2013, 12:49:11 PM »

hi
what cam software do u use?
u can do it by just set ur "step down" smaller than final depth
wish to help

8

General Mach Discussion / Re: delay in PWM pulse (LaserMode)

« on: January 16, 2013, 03:11:32 PM »

hi tweakie

It would be helpful if you could zip and attach a simple GCode program which demonstrates the problem.

not Gcode but Ccode
program for AVR micro!

9

General Mach Discussion / Re: delay in PWM pulse (LaserMode)

« on: January 16, 2013, 05:03:02 AM »

hi Tweakie
so it can be general issue, but i think it's not the tickle pulse problem (bec tickles are so short about us) i can't imagine away to change gcode for a minimum DC, but instead it's easy to change my Ccodes in AVR micro to do that, hope soon reply the resualt.
what about the minimum DC in mach config, it has no effect on the outgoing pulse of com, i've set it to 50% and the worse resualt, it doesn't pulse untill to reach 50% of feed rate and at that point starts with 50% DC, so more uncutted path of the shape!

10

General Mach Discussion / Re: delay in PWM pulse (LaserMode)

« on: January 15, 2013, 01:54:58 PM »

so much thanks of ur reply
you are right, i'll try it ,but i have found another issue which may help others.
it is with psu (match with my 80w reci tube), as user guide says it operate at 29ma for maximum 80watt optical output, so with a 10% duty cycle there is about 2.5mA and there should be about 10% of output power, but the tube doesn't act at all before reaching to more than 3mA so the machine doesn't cut some first mms of any shape.
in laser mode there is always outgoing pulse of computer with very low duty cycle i thaught with a 10% minimum PWM dutycycle in configuration will force it to be 10% , but it doesn't change even if i put it to be 90%