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computer causing gorilla cnc glitch
« on: November 28, 2008, 12:34:01 AM »
i seem to have a problem that cannot be resolved .With the cnc machine powered up, turning on the computer (win xp) during booting the cnc machine drives the z axis down by 2.5 to 3 inches( loss of control ).
I have changed all the settings on the parallel port ,changed the cable to the gorilla cnc and tried 3 computers ,problem does not go away and i'm afraid to use the machine as it could damage the z axis or the gantry.i have been shutdown for a week so far.
I don't know what to do

http://www.youtube.com/watch?v=EngUvy3YKAE

Offline Hood

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Re: computer causing gorilla cnc glitch
« Reply #1 on: November 28, 2008, 02:17:06 AM »
Check all of you shielding is properly grounded to one single pointand that none have come loose, especially the step/dir wires to your drives
Hood
gorilla cnc problems
« Reply #2 on: November 28, 2008, 05:12:58 PM »
Thanks for the tip checked all that and its ok.But........
Well i found out that this is the way it is,if the cnc is powered up during computer  boot up it will move,  manufacturer says its how the parallel port works on some computers .I have tried 5 computers and they all drive the machine crazy dangerous.The gorilla people suggested a charge pump board that will stop this  at a cost to be about $300.00,I'm starting to learn that this machine has no stops ,no preventions, its minimal for looking after a mistake or glitches  and could cause serious costly trouble.
The manufacturer says its mach3 working through the parallel port if it was usb this would not be happening
I never knew this from the start and its less than 1 year old

Offline Hood

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Re: computer causing gorilla cnc glitch
« Reply #3 on: November 28, 2008, 05:32:10 PM »
You could get a SmoothStepper for $150 which works through USB. All you would then need to do is plug your PP cable into the SmoothStepper (if you order the ribbon to parallel port cable)
 You could also probably just get a decent breakout board that has the chargepump already and that will be a lot cheaper than $300, I have PMDX 122 and like them, think they are around about $80.
Hood
Re: computer causing gorilla cnc glitch
« Reply #4 on: November 28, 2008, 05:51:42 PM »
300.00 for a 25.00 safety charge pump? criminal.go to cnc4pc . download the instructions. or, you could install an on/off switch on the power to your breakout board. turn it on only after the computer has booted up.
Re: computer causing gorilla cnc glitch
« Reply #5 on: November 28, 2008, 06:52:30 PM »
all the ideas are good except the power switch as you're forgetting ,if the machine was doing a 3 hour job  and it had a computer glitch and re-booted
and drove the router/spindle into the table especially where the steel support beam was it would be a disaster.
I feel the machine should have had some safety protection to protect itself.
Some ideas here are good  and i will look into them ---thanks

Offline bowber

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Re: computer causing gorilla cnc glitch
« Reply #6 on: November 29, 2008, 05:36:44 AM »
As you've found out this is a problem with booting a computer while your machine is on, the post and OS send signals to the PP, so as has been said use a charge pump, this will stop that happening.
I will add though that you should be using a UPS on your control computer, this will help with most computer problems and is a must when controlling expensive equipment.

Steve
Re: computer causing gorilla cnc glitch
« Reply #7 on: November 29, 2008, 06:43:47 AM »
i have never had mach3 shut down or reboot during the execution of a part. while i dont do 3 hour single jobs,my plasma cutter has cut
hundreds of 12'x6' steel  nested parts files of up to  25 minutes duration each. mach has never failed , as compared to the shopbot controller that would fall on its ass several times a day.  put on the charge pump. it will shut off the power to the breakout board if mach goes wonky.
Re: computer causing gorilla cnc glitch
« Reply #8 on: November 29, 2008, 09:35:13 AM »
thanks  I will add the charge pump  and I'm also going to try a pci lpt port add on , some say this cleans up the lpt port.
I tried 5 different computers and they all cause this whether they are new or old
I appreciate the help.

 
   
 
Re: computer causing gorilla cnc glitch
« Reply #9 on: November 29, 2008, 10:32:17 AM »
thanks  I will add the charge pump  and I'm also going to try a pci lpt port add on , some say this cleans up the lpt port.
I tried 5 different computers and they all cause this whether they are new or old
I appreciate the help.

 

That would suggest to me your real problem lies outside the PC - something about the way your drive electronics are setup that causes an high noise sensitivity....

Regards,
Ray L.
Regards,
Ray L.