Problem with stepper motor stuttering

[LockTech]

I'd like to start by saying I am a noob at this so forgive me if I use incorrect terminology.
I recently bought a Hobby CNC package to go on my taig tabletop mill. I am having problems with the stepper motor stuttering and just outright stopping, however its evident its still trying to turn. I would say it sounds like classic binding problems, however it still does it even when the motor is in hand.

The stepper motors that came in the kit are
23-305-DS8A
4.2v 3a 1.4r

The software is Mach3

The controller board is also from HobbyCNC and came in the kit.

Any ideas would be greatly appreciated

Keith

[dougdv]

if it happens as you turn it by hand, if that is what you meant then I'de say it's a motor hardware problem otherwise check this out - http://www.machsupport.com/forum/ind...ic,1187.0.html
You access 'motor tuning' in the config menu. Hope it helps.