Warco VMC mill conversion

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9fingers:
Hi Treb, Welcome to the forum.

I'm still experimenting with steppers and still learning but I have found that you have to ramp up the stepper speed from zero to the desired step speed gradually otherwise steps will be lost.
I *think* this is done by mach3 when in CNC mode but not sure.
If your manual jog inputs are being routed direct to the motor drivers, then this could be your problem.

There will be more knowledgeable people here who will possibly know.

Bob

treb63:
Hi,
I've tried tweaking the velocity response in motor tuning and when jogging only one motor all is usually fine, to be on the safe side I've reduced the velocity parameter down until the motor response is noticeably slow to accelerate.
Just don't want to fork out for increased power supplies unless I'm sure were on the right path.

kstrauss:
As others have mentioned you do need to ramp the stepper speeds to avoid losing steps. Why not check the power supply voltage while running all three motors? I would use an analogue meter (rather than digital) because it is easier to see flucuations.

9fingers:
OK - just looked at the spec of your power supply and it soiund like it is rated at sufficient current but it depends on what the transient response is like.

You might get some idea by attaching a multimeter set to AC volts and then provoke the fault situation and see what the meter reads. The result will depend on the quality of your meter (true RMS types are best)
A perfect PSU will read next to nothing and I would not worry at a volt or so but it should give you an idea if the psu is sagging badly.

Bob

treb63:
Hi Bob,

Will give this a try later today, so connect my Fluke meter set to AC volts across the 48v DC rail supply to the Drives and make the machine fault out. Then see if there is or has been any fluctuation in the AC reading.
Thanks will report back asap.

Rob

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