Electronics for New Machine + Chinese Spindle + VFD

[Clive S]

Hey guys....

Somehow mach3 managed to stop driving my A axis in sync with my Y axis.
Luckily i realised before any damage was done I think. i maybe moved the y axis 15mm while the A was stationary.

Here is the sequence of events that led to this.

1. Pressed Home to home the machine.
2. Pressed stop after the Z had homed, during the Y axis homing.
3. Manually Jogged the Y Axis. (A did not move).

Anyone else ever experienced anything like this ?

Seems like a fairly dangerous bug to me...

Cheers
Martin

Well you haven't said how you have got it all wired!! Also you said you pressed stop before the homing was finished and then tried to jog. After the stop or estop you need to rehome the machine. I wonder where the dangerous bug is.

[JAZZCNC]

It's not so much a bug rather less than perfect way mach homes with slaved motors and your actions while homing.
When homing mach de-couples slaved axis meaning they work as separate axis again. When you interuppted the homing sequence mach is still in de-couple mode so when you jog it only moves that axis, in your case Y.

If you had pushed E-stop and reset mach then this probably wouldn't have happened because the home script would have been cancelled.

However there is a possible work around if you want to prevent it happening.? I haven't tested this but sure it will work.
You can change the homing script and turn off Jogging while homing. To do this use this command at the start and end of the homing script.
DoOEMButton(103)

To do this go to Operator menu and select Edit button script. This will start the Ref-all-home button flashing. Click on it and script editor will open.
Insert DoOEMButton(103) at the beginning and end of the script then save it.

Now it should toggle Jog off while homing and toggle back on when finished. Obvisouly you won't be able to jog if you press stop or cancel homing. Also you may have to turn Jog back on manualy because it won't get toggled back on because the home script didn't finish.

Try it there's nothing to lose.

[mturneruk]

That's good to know Jazz.
I would describe it as a bug as there should be no way you can end up mashing up the machine regardless of what you do in Mach3.
Obviously i won't do it again.

Cheers
Martin

[mturneruk]

Hey chaps...

Here is a video build log of the machine and first cuts which were made yesterday.
Thanks for all your help.

https://www.youtube.com/watch?v=vjjTnn1KmRg

Cheers
Martin

[Clive S]

Very Nice Martin its a credit to you.