On Thu, Oct 15, 2009 at 10:02 PM, Ian W. Wright <watchma...@talktalk.net> wrote:
> Hi,
>
> I am totally perplexed! I have two apparently very similar
> stepper motors - i.e. made by the same company ( Oriental
> Stepper), both 32 size and single stack although one is
> about 1/4in longer than the other. Lets call them X and Y to
> avoid confusion. I also have two driver boards - not
> identical as I blew one up recently :_{ - one is a
> commercial microstepping board, set to abut 1.5A capacity
> and the other is a L297/L298 board - both are set to half
> stepping. Lets call these A and B.you didnt state current for driver B I had them connected up > on a little machine with motor X driven by board A and Motor > Y by board B and everything ran fine. I decided that I > wanted to swap the axes over and so I unplugged motor X from > board A and plugged it into board B and vice versa for motor > Y. Now motor Y connected to the L297/l298 board had no power > at all - the spindle rotated feebly but the slightest touch > on the spindle stopped it and it just sat there quivering > and buzzing gently. Motor X was quite happy and running at > full power. I changed them back again and once again both > motors ran at full power .... I did the changing over > several times to verify that it wasn't due to a bad > connection or something and I double checked that both > motors were wired in exactly the same way - also that the > EMC2 settings in the .INI file were the same for each axis. > > I can't find any data on the motors as they are obsolete, > so I can't tell if there are any differences in the windings > but both sets of coils ( they are 8 wire motors wired as 2 > series pairs of coils and the pair colours correspond on > both motors) seem to be wired the same and have the same > resistance on both motors. but what resistance > > Does anyone have any words of wisdom to explain this > phenomenon? It has me completely baffled.... also the inductance of the coils will effect the amount of current the drivers can supply Dave Caroline by the way Midland Model Enginerr ex TOMORROW some of us brits meeting near the Arc Eurotrade cnc stand around 11:30 ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
