stepper motor stall?

[john swift]

from your description I don't see any thing wrong

do you have the stepper driver enable inputs connected ??

if you do
try running with the enable disconnected
(the enable is a negative logic input so the drive is enabled with no input !! )

if Mach 3 is a bit slow enabling the drive that could be a cause of you missing steps


what position do you have switch 4 ?

if its off , the motor current will be reduced when the motor is idle

switched on , the current remains at the 4.2A you set the stepper driver to.
and you should feel more resistance when you try to manually turn the hand wheel



John

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[Doddy]

from your description I don't see any thing wrong

I quite agree. Thanks, Richard, for the reply. It does sound as though the steppers are underdriven... but I can't see any cause.Not sure about sw4 - you do say it stalls when operating so half-current setting shouldn't come into play. How warm are the steppers after a protracted period energised?, if not hand-hot then try upping the current setting on the drivers. After that I'm out of ideas.

You've not got any silly-long lengths of cable in the system?, no dodgy fine gauge cables to drop the supply voltage at the stepper driver?

Ah, one point - you still have the trapezoidal lead screws... ah - they will put a larger load on the steppers than a ballscrew... but you do use powerful steppers. Nope, I'm out of ideas.

[Clive S]

Just my 2 cents worth how big are the hand wheels because they will take a lot of inertia to drive them.

[mancave newby]

hello all out there,thought i would try to send some pics of my man cave,hear goes