need help

[paul60]

I have replaced my computer and reinstalled mach3.
my x and y axis moves, but z does not move.
what should i be checking?
i also get a message that one or more axis are tuned to fast for 25000 speed
these are the same setting i have been using.
steps per 1833.189846 velocity 600 acc 15 x and y
Z 2293 velocity 600 acc 15.
My cnc is a prt shopbot
thanks paul

[Gerald D]

Did you copy the Mach3Mill.xml file from the old computer to the new computer? That should cure the problems mentioned above. (Also remember to transfer the licence file)

[paul60]

Thanks Gerald.
the hard drive on the old computer has crashed.
so has to start from scratch.
paul

[paul60]

Z axis problems


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i set up another computer installed and set up tuning xy and z also zero plate setting.
everything worked.
i then tried to run a file the z axis drove to the top and slammed into the stop.
i tried other files same problem.
also reinstalled everything same problem/
also tried another computer same problem.
once this happen the zero plate does not work anymore.
bit comes down hit plate does not move up.
i wonder if this can be a controller problem.
hope someone can help
paul

[bradm]

Paul, I think you need to address the "tuned too fast for 25000" problem first.

It appears that your older computer had better latency than your new one, which isn't uncommon. The last time I was forced to upgrade my driving computer, the new one dropped my top jog speed by 25% due to lousy latency.

If you are overdriving the computer, all sorts of strange things can happen.

From your description, you have a Z axis that only runs in one direction, but it has done so in both directions at different times. The next thing I'd look at is the direction signal to the Z driver to confirm that it's actually delivering a usable signal level.

[paul60]

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More problems
i set up another computer installed and set up tuning xy and z also zero plate setting.
everything worked.
i then tried to run a file the z axis drove to the top and slammed into the stop.
i tried other files same problem.
also reinstalled everything same problem/
also tried another computer same problem.
once this happen the zero plate does not work anymore.
bit comes down hit plate does not move up.
i wonder if this can be a controller problem.
hope someone can help
paul

[paul60]

Hi Brad
thanks for your reply
i do not have the tuning to fast problem any more. and the computer i replaced is the same
as the one that crashed.
so i do not think that i am overdriving the computer.
how do i check the signal to the Z driver to confirm that it's actually delivering a usable signal level.
very new to all of this.
paul

[Richards]

Paul,

To clearly see the signal, you'll need an oscilloscope; however, if you set your feed to a very slow speed, you might be able to see the signals with multimeter. The problem is that the pulse will be just a few microseconds long. Most meters will see that as noise.

If you have a PMDX-122 or other break-out-board that has LEDS, the LED will pulse. It it pulses, the signal is strong enough for the break-out-board to process.

Check the polarity settings in Mach3. Also, check the steps per inch or mm.

[paul60]

i beleive i have the problem solved [ hope so]
i checked the wiring on the controller everything seems ok
i then removed the printer port cable connect it back and it worked [so far]
so i will replace the cable
thanks for all the help
paul