[samu]

Running a Taig micro mill with Mach 3 and gecko drive. Sometime, anywhere in any program one or more axis execute an uncommanded move in rapid feed. If nobody stop machine, it crashes in the work or it moves until it reach overtravel.

[Fixittt]

i got an idea why not post this problem all over the board? Ohh wait you already did! HAHAHA just giving you a hard time.........

have you checked your wireing? possible noise problem? Does it only happen with a certain type of code?

[ger21]

Try updating Mach to a newer version. What version are you using?

[Fixittt]

is this a new setup and has always done it or is the problem accruing after a few months/years? need more info

[THend]

If you are running a servo setup, the encoder is not seeing or working properly. When the encoder does not get the signal to the Gecko drive, the servo motor will run in the direction it THINKS it needs to go until the machine crashes. At that time, you likely trip on limit switches or the Gecko drives will fault in an attempt to preserve the machine.

1. Verify your wiring to the Gecko drive is in good quality. Tin the wires prior to inserting and seating them.

2. Your encoder may be dirty, or most likely a wiring problem under the cover, or in the splices. Depends on how you built the machine or how the machine was built.

3. On my machine, I turned on the Drives etc.. but not the PC. So, there were no signals to the Geckos...per se anyway. The machine should just sit there all dumb and happy. Tap around all the connections, and if the machine jumps you may have gotten closer to the failed feedback encoder.

When a Servo driven system goes nuts, as in runs full speed in one direction or the other, the feedback is not doing its job.

I know first hand, trust me.......

[samu]

My version of mach3 is 3.041,
I use stepper not servo.
This probleme not seems to be related to a certain type of code.
My cable from the parallel port of pc is shielded but my enclosure is not grounded. If it is a noise problem, how to diagnostic it and wath are possible solutions??

Thanks for your reply

[Fixittt]

first thing I would suggest is drop back from your version of mach to a lock down version

[samu]

first thing I would suggest is drop back from your version of mach to a lock down version

wich version do you suggest, i tought version 3.041 was a lock down version.

[Fixittt]

i would go with the 2.61 -2.62 versions, which can be had from the mach3 ftp site.

[ger21]

When the machine takes off, are the DRO's moving and showing the correct position? If the DRO's don't move, it's very unlikely that Mach is moving the machine. I read both Mach support sites daily, and have not seen any similar complaints.

[Khalid]

I think he is running other applications on the same computer that interfere step/pulse signals...