Re: [CAD_CAM_EDM_DRO] EMC Following Error

David

Following errors while running steppermod means the computer can't put out
the steps as fast as you are asking it to, and you're are asking quite a bit
of the
computer by trying to output 32,000 steps per inch at 1.2 inches per second.
Since you can't do much about the steps per inch at this point, you can try
to lower your max acceleration to somewhere around 5 and the default
acceleration to about 3. If this fixes the problem, you can up the numbers
a bit and try again until the problem comes back. If that does not work try
lowering the max velocity. Even if you get this to work well when doing
straight jogs, running a program with circular interpolation in it will
probably
cause lots of following errors. What speed computer are you running?

Probably your best bet is to get the number of steps per inch down to a more
reasonable level either by changing the belts and pulleys or ask Mariss of
Gecko Drive if you can plug the step multipliers onto the G320's and make
them into G340's. Set them for 10X and drop your input scale to 3,200 steps
per inch. I think they are about $25.00 each.

Of course others may have different or better answers.

Bill

> I am trying to get EMC working with a small mill. I have Gecko G320

drivers

> and am using steppermod. I can jog the axes back and forwards by the

amounts

> I expect and in the right directions. However, I occasionally get

following

> errors and do not understand why.
>
> The emc.ini parameters that I think are relevant are:
> TASK = minimilltask
>
> ; Trajectory Planner
> section --------------------------------------------------
> EMCMOT = steppermod.o
> DEFAULT_VELOCITY = 0.0167
> MAX_VELOCITY = 1.2
> DEFAULT_ACCELERATION = 20.0
> MAX_ACCELERATION = 20.0
>
> ; Axes
> sections ---------------------------------------------------------------
> ; First axis
> [AXIS_0]
>
> TYPE = LINEAR
> UNITS = 0.03937007874016
> HOME = 0.000
> MAX_VELOCITY = 1.2
>
> INPUT_SCALE = -32000 0
> OUTPUT_SCALE = 1.000 0.000
>
> FERROR = 1.000
> MIN_FERROR = 0.010
>
> I have other questions about the emc.ini file but I'm happier taking one
> step at a time!
>
> Regards,
>
> Dave.
>
> David Micklethwaite
>
>
>