Re: Aaah! (Magically Moving Steppers)

Hi,
I agree with Jan about getting rid of the 12V supply. I do use
24V switchers without any problems. Some people that use switchers
like to throw a big cap on there to help smooth things out, I have no
problems with that though.

If you want, you can contact me directly off-list to help get your
problem resolved.

xylotex @ hotmail.com
(remove the spaces around the @)

Jeff
http://www.xylotex.com


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "abbylynx <abbylynx@y...>"
<abbylynx@y...> wrote:

> Aaah! I spent some time trying to fix a problem with my parts

coming

> out lobsided, and just believe I may have found it.
>
> My system is on, then I turn on the Spindle of the Sherline, turn

it

> up to max. The Sherline spindle is not connected to the CNC system,
> it's the plain old power switch on the spindle of the mill.. I

turn

> the speed control up to max.
>
> I then watch the rear-shafts of the motors, and though they were
> holding still before, they now roll back and forth every few

seconds

> by a small amount. Aaah! I'm thinking this is due to induced mains
> hum throwing the dir/step pins. Any advice?
>
> My system is a little limited still, so it's basically:
>
> Xylotex driver board
> Switched Mode PC power supply (12V driving the steppers)
> BF Cap 47,000uf
> Some big NEMA23 steppers
>
> Could it be the switched mode power supply in some way? It driving
> the logic also, I understand that switched mode PSU's employ PWM to
> provide the correct power level (just like a chopper board), could
> this be interefering with the system?
>
> Any advice greatly appreciated.