Re: INCONSISTENT STEPPING - WIERD SITUATION

Jeff,

Glad to hear that. The motor should not "growl" under any
circumstance. Check the current set resistor value. See that it is
correct for your motor wiring. If you are wired in series, use half
the rated current. This is for growling at low speeds (below 5 revs
per sec).

If it "growls" at higher speeds, is your motor a size 42 and did you
order the "size 42" modification? If it is and you didn't, return it
for the mod. That will tame it. Turn it into a pussycat. A meow
instead of a growl.

Mariss

--- In CAD_CAM_EDM_DRO@y..., "ja_erickson" <ja_erickson@y...> wrote:
> Evening All,
>
> GOOD NEWS !!! Mariss suggested that i change from using a seperate
> power supply to the game port power out and it corrected the lost
> stepping and intermittent stalling. when i put a voltmeter from
> direction to ground i had voltages of .756 and 3.38 during
> directional changes. if these voltages are supposed to be 0 and 5
> volts then something is still in error.by the way i have
constructed
> the current dump circuitry and have also implemented this.when this
> motor is running it runs very smoothly at feedrates of 10 i.p.m. or
> greater in any direction , however at feedrates below this the
motor
> still growls and sounds unhappy but hasn't lost any steps YET.is
> there any other procedures that i can do to eliminate this? i have
> tried the trim but theres not enough trim to be had !!!! haha
>
> i'd also like to thank each of you for your help and insights
>
> jeff
>
> --- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...> wrote:
> > Art,
> >
> > Not to worry. The multipliers were originally designed for point
to
> > point operation; machine stops, change direction, go again.
> >
> > People started using them for constant contouring.
> >
> > That required a revision so that each sent step is "tagged" with
> its
> > direction. When the step executes, it goes in the direction it
was
> > tagged with. That was done on REV-4, 3 months ago. No more
problems.
> >
> > The next revision will have it tagged 4 steps deep. The only way
to
> > spoof it then will be to change direction 4 times while
> accelerating.
> > Not a realistic situation.
> >
> > Though it was never designed to do constant contouring, with REV-
4
> it
> > has been able to, based on reports and extensive testing here.
> > Because I am paranoid about this, REV-5 will quadruple-nail this
> > situation shut.
> >
> > You are taking care of this in software. The REV-4 (current
> version)
> > takes care of it in hardware as well.
> >
> > Mariss
> >
> > --- In CAD_CAM_EDM_DRO@y..., "Art Fenerty" <fenerty@h...> wrote:
> > > Surprisingly enough I have had this complaint before. It is
> usually
> > the
> > > step/dir pins being swapped or the polarity is wrong. Gecko's
do
> > indeed need
> > > special handling of the DIR bit ( Actually, it must be held on
as
> > long as
> > > the multiplied pulse train) but Master5 takes this into
account.
> > (Couldn't
> > > have it NOT run Marisses drives..that would be kiss of death).
> > >
> > > Try swapping step/dir or polarity and see what happens.
> > >
> > > Good luck,
> > > Art
> > > Master5 Software
> > > http://users.andara.com/~fenerty/master.htm