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1

PoKeys / Pokeys pokeying around...

« on: June 21, 2019, 12:34:53 PM »

Hi Folks, I have a bit of a dilemma here, when i disconnect the pokeys57cnc board my motors turn smoothly, but when i connect the board they get sticky.
This happen whether they are switched on or off. when i run some code it is randomly jittery and when its all off and i turn the motors by hand they are sticky. I'll attach a short video link that shows the stickyness when everything is swithched off and i turn it by hand.
All the axis do exactly the same, I asked support and they said "When stepper motors are turned, they act as a generator, producing power. When there is enough power generated to turn on the stepper driver control circuit, it will try to take control (stop the motor). This also depletes the power and you are back to almost free running". but that doesnt explain the problem when they are being run by the computer.
Is there something simple i am missing here like a ground or something, any leads or help will go a long way to making my day. Thanks
here's the vid link. https://1drv.ms/v/s!AvolCJeAoVyswy-5qU4Zh9tpmP-r?e=6UT5m0

2

General Mach Discussion / invisible gremlins

« on: October 25, 2018, 09:45:52 AM »

Hi everyone,

I'm new to this forum but glad to be here, i have a strange problem that i'm hoping someone can help me with.

I have a 3 axis router, 3m x 1.5m x 350mm gantry type. I have Mach 3 and i have just finished building it and i am soo looking forward to running some code, (its my first build) but therein is my problem, when i "Ref all home" it does exactly what it should, if i "go to zero"... no problem, i can type a line of code on the MDI and it executes without a hitch, but i cant run a gcode without all the axis's going scatty, they make jerky movements big enough to shake the neighbours house.

I chased EMI around for about 3 weeks till i realized its not that, i did have a little trouble with that (emi) but i re routed my spindle cable and it is sorted.

Does anyone have any idea why i cannot run a code through mach3 without this jerking.

I tried some of my own code and i tried the default road runner but i get the same jerky movements, i cant let it run for more than a few seconds, its too rough. My motors are fine, my break out board is ok, my micro stepper controllers are ok, the spindle is ok, it just wont let me run gcode from the computer.

I think it is a mach 3 setting somewhere but i can't find it. Any ideas?

Thanks in advance
Tackleboxman