Re: EMC steps/rev calibration

Hi Dan:

I agree with what you say. I've tried setting it to 10000, but EMC
hangs on startup. What do you recommend for the OUTPUT_SCALE
setting? I've tried 1, 10000, 2000...and a few others.

Thanks,

r

--- In CAD_CAM_EDM_DRO@y..., "Dan Mauch" <dmauch@s...> wrote:
> I think I see the problem. You have a 500 CPR encoder. In quadrature
> that would be 2000. So change the input scale to read (2000X5)
10000 and
> that will solve the problem. Leave the jumper where it is.
> Dan
>
> -----Original Message-----
> From: nahydro [mailto:r_fl_z@h...]
> Sent: Saturday, June 01, 2002 12:14 AM
> To: CAD_CAM_EDM_DRO@y...
> Subject: [CAD_CAM_EDM_DRO] Re: EMC steps/rev calibration
>
>
> Alan:
>
> Thanks for trying. I wish it was as simple as mis reading the
jumper
> setting. I've tried all four positions, and am convinced I have
that
> part right.
>
> I am now running the G340 at 1x, 500 cpr encoder, and 5 tpi
> screw...which should make INPUT_SCALE 500*5 or 2500. I am using
> steppermod. A one inch jog results in the motor turning about 1.25
> revs instead of 5.
>
> I've pasted the relavent emc.ini for the first axes below for
> reference. If something is wrong with it, I can't see it. Is it time
> for DOS?
>
> TIA
>
> ; Trajectory planner section
> --------------------------------------------------
> [TRAJ]
>
> AXES = 3
> ; COORDINATES = X Y Z R P W
> COORDINATES = X Y Z
> HOME = 0 0 0
> LINEAR_UNITS = 0.03937007874016
> ANGULAR_UNITS = 1.0
> CYCLE_TIME = 0.010
> DEFAULT_VELOCITY = 3
> MAX_VELOCITY = 5
> DEFAULT_ACCELERATION = 5
> MAX_ACCELERATION = 5
> PROBE_INDEX = 0
> PROBE_POLARITY = 1
>
> ; Axes sections
> ---------------------------------------------------------------
>
> ; First axis
> [AXIS_0]
>
> TYPE = LINEAR
> UNITS = 0.03937007874016
> HOME = 0.000
> MAX_VELOCITY = 5
> P = 1000.000
> I = 0.000
> D = 0.000
> FF0 = 0.000
> FF1 = 0.000
> FF2 = 0.000
> BACKLASH = 0.000
> BIAS = 0.000
> MAX_ERROR = 0.000
> DEADBAND = 0.000
> CYCLE_TIME = 0.001000
> INPUT_SCALE = 2500 0
> OUTPUT_SCALE = 1.000 0.000
> MIN_LIMIT = -100.0
> MAX_LIMIT = 100.0
> MIN_OUTPUT = -100
> MAX_OUTPUT = 100
> FERROR = 1.000
> MIN_FERROR = 0.010
> HOMING_VEL = 0.1
> HOME_OFFSET = 0.0
> ENABLE_POLARITY = 0
> MIN_LIMIT_SWITCH_POLARITY = 0
> MAX_LIMIT_SWITCH_POLARITY = 0
> HOME_SWITCH_POLARITY = 1
> HOMING_POLARITY = 1
> JOGGING_POLARITY = 1
> FAULT_POLARITY = 1
> ; Parameters for Inland Motor BMHS-0701 X 20
> TORQUE_UNITS = OZ_IN
> ARMATURE_RESISTANCE = 1.10
> ARMATURE_INDUCTANCE = 0.0120
> BACK_EMF_CONSTANT = 0.0254
> ROTOR_INERTIA = 0.0104
> DAMPING_FRICTION_COEFFICIENT = 0.083
> SHAFT_OFFSET = 0
> REVS_PER_UNIT = 5
> ; Parameters for generic amplifier
> AMPLIFIER_GAIN = 1
> MAX_OUTPUT_CURRENT = 10
> LOAD_RESISTANCE = 1
> ; parameters for generic encoder
> COUNTS_PER_REV = 500
>
>
> --- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...>
wrote:
> > Hi Andy,
> >
> > Seems like you might have had a similar experience. When I first
> setup
> > jumpers on a G901 board (installed in my G201, same goes for
G340),
> I
> > misread the instructions, and got a 5x instead of a 2x I wanted.
I
> > figured it out by swapping jumpers until I got the rate I
expected.
> > Rereading the documentation again, I saw another way it could be
> read.
> >
> > In fact, I'm still trying to figure out what would be the best "X"
> for
> > minimizing the effects of an uneven pulse stream. Let the Gecko
> "use
> > up" my irregular stepping interval with microsteps?
> >
> > Alan KM6VV
> >
> >
> > andyolney wrote:
> > >
> > > I think that the documentation was incorrect on the original
> G340s.
> > > Might try changing the jumper to see. Andy
> > >
> > > --- In CAD_CAM_EDM_DRO@y..., "nahydro" <r_fl_z@h...> wrote:
> > > > Alan:
> > > >
> > > > Thanks for trying to help. Unfortunately, that is not the
> > > problem.
> > > > I've repeatedly checked the jumpers on the Geckos, and if the
> > > > documentation is correct, I believe I have them set correctly
> for x5
> > > > (second jumper position).
> > > >
> > > > r
> > > >
> > > > --- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...>
> > > wrote:
> > > > > Hi Nahydro,
> > > > >
> > > > > Perhaps you're actually setting x2 instead of x5 on the
Gecko?
> > > > >
> > > > > Alan KM6VV
> > > > >
> > > > >
> > > > > nahydro wrote:
> > > > > >
> > > > > > I'm getting about half of the motor revs per inch of
travel
> > > that I
> > > > > > want, and can't figure out why.
> > > > > >
> > > > > > My setup: EMC with 5 tpi screw, 1024 cpr encoder, and
G340's
> in
> > > x5
> > > > > > mode.
> > > > > >
> > > > > > I have INPUT_SCALE = 1024 0 and OUTPUT_SCALE = 1 0.
> > > > > >
> > > > > > When I jog 1 inch (any axis) I get about 2.5 motor shaft
> > > > rotations. I
> > > > > > expect 5.
> > > > > >
> > > > > > Any ideas? TIA
> > > > > >
> > > > > > r
>
>
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