Re: lost steps

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
> cdoughtynz wrote:
>
> >The software I am using is Lcam and the 0.25mm diameter is the
offset
> >required to get a 5 mm hole using a 3/16" cutter.
> >the software has been checked out with a Larken board and that
does
> >not lose a single step.
> >I have 2 machines one with larken drivers and one with Gecko's,
both
> >using the same software. one loses steps and the other doesn't.
> >has anyone else had this problem?
> >
> >
> Gecko drivers have a strange requirement for the direction signal.
It
> must stay in the right
> state AFTER the step pulse is issued, until the step actually goes
out
> to the motor. With
> microstepping and step multiplier drives, that can be a long time,
> depending on the conditions
> at that moment.
> Most other step drivers require the direction signal to be stable
some
> microseconds before
> and hold a microsecond or so after the leading edge of the step
signal,
> and then it can
> change. This causes trouble with some programs. I had to modify
my
> stepper controller
> board to accomodate these drives. It has a flip flop that latches
the
> direction signal when
> the step pulse occurs and holds it in that state until the next
step pulse.
>
> Jon