Re: [CAD_CAM_EDM_DRO] 5-Phase steppers

Hi Peter,

A ROM could do it, or a state machine in a PAL (programmable array
logic). A PIC could also do it.

Alan KM6VV


Peter Barrett wrote:

> Thank you very much for your help, particularly Anders who sent me some
> good stuff.
>
> I am considering a retrofit project on a large Yasda milling machine
> which is presently running on ancient Fanuc30 and "electrohydraulic
> pulse motors"
>
> I've had them stripped apart on the bench and i can see it would be easy
> to throw the electro (5-phase) part away and put servos or "normal"
> steppers in.
>
> The owners of the machine have asked me if the existing motion control
> can be retained and the new (EMC) control set up in parallel, to
> minimise downtime.
>
> When I look at the half-stepping sequence as shown in the pdf it is
> 19, 17, 25, 28, 12, 14, 6, 7, 3
> or it could be expressed as increments and decrements like so
> -2, +8, +3, -16, +2, -8, +1, -4
> how would one implement such a pattern in hard-wired logic?
>
> PeterB
>