I've now completed the build of my hobby cnc board, and tried to use the motors using an old AT Power supply i found lying around. I did not modify the power supply in any way I just connected the Board to the power supplies -5V and +12V to give me around 17V.
The motor on the X-axis was hissing, but the other 2 weren't.
There was also no movement, when i tried to jog using mach 3.
The Motors are rated at 2.8Amps, 1.8 step.
Is this because the power supply doesn't have enough amps???
or something else???? I know i need a minimum of 16.8Amps, but i have no way of measuring the ampage as my multimeter will only do a max of 10A DC.
I was looking at this to replace the AT Power Supply
http://cgi.ebay.co.uk/250W-12V-20A-S...ayphotohosting
and was wondering if it would be suitable, its from china and i dont really want to wait for the shipping, ( IF there is another way) as i'm getting impatient and what to see these motors move.
Does anyone have any ideas.
Thanks
David