Re: emc and following error problems

..eh

First ting eh. Unable to move an axis at any speed is a good clue that
something big is amiss. I'd vote for the parenthetical part of #1
first., #3 second. #2 is in there so you don't go to sleep waiting for
it to go.

1 - I have not had a chance to try out the univstepmod.o yet but it
should go. (I'd also make output scale equal to input scale, just in
case)

2 - Accel is units per second per second. With tiny units it will be
real slow getting up to 20 units per second.

3 - In metric mode you will need to multiply the following error values
by 25.4. They are in percent of a unit and with the metric definitions
your units are small to begin with.

4 - Deadband is way big. Half a mm is specified and that sounds more
like backlash but it won't run well with that much lash in the file.
Half a pulse for deadband is okay although Paul recently said take two
pulses.

My real inclination is to define the machine in inch since the screws are
that and then run it all in g21.

HTH

Ray

On Wednesday 27 November 2002 04:02 pm, you wrote:
> Message: 10
>    Date: Wed, 27 Nov 2002 17:46:03 -0000
>    From: "got_milk_eh" <got_milk_eh@...>
> Subject: emc and following error problems
>
> Hi,
>    I'm setting up emc for the first time and I'm getting
> following errors.  So far I have been unable to move any of the
> axis.  As soon as I try to jog, it gives me the following error
> and estops.  I'd appreciate any help the list can offer.  My
> setup is as follows,
>
> BDI 2.16 with EMC 2.18 update.  I recompiled 2.18 after getting a
> patch from Jon Elson for his universal stepper board.  EMC starts
> and runs fine.  Computer is a p233 with 128M ram.
>
> Universal stepper board from Jon with gecko 210's in full step
> mode, have not put the step multipliers on yet.  
>
> Taig mill, with 20tpi screws in metric mode for emc ini.
>
> Here's the ini file,
<snips>
> EMCMOT =              univstepmod.o
<s>
> MAX_VELOCITY =          20.0
> DEFAULT_ACCELERATION =  2.0
> MAX_ACCELERATION =      2.0
<s>
> ; First axis
> [AXIS_0]
>
> TYPE =                          LINEAR
> UNITS =                         1.0
> HOME =                          0.000
> MAX_VELOCITY =                  20.0
> P = 1000.000
> I = 0.000
> D = 0.000
> FF0 = 0.000
> FF1 = 5.000
> FF2 = 0.000
> BACKLASH = 0.000
> BIAS = 0.000
> MAX_ERROR = 0.000
> DEADBAND = 80.000
> CYCLE_TIME =                    0.001000
> INPUT_SCALE =                   157.480315555 0.000000000
> OUTPUT_SCALE = 1.000000000 0.000000000
> MIN_LIMIT =                     -1000.0
> MAX_LIMIT =                     1000.0
> MIN_OUTPUT =                    -10
> MAX_OUTPUT =                    10
> FERROR = 1.000
> MIN_FERROR = 0.250