RE: [CAD_CAM_EDM_DRO] Re: EMC steps/rev calibration

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@...]
Sent: Saturday, June 01, 2002 12:14 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
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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