Re: EMC Contouring Settings/ downloading BDI

Art,

The controls I have seen warn against this type of move, for exactly
the reasons you bring up. It is simply disallowed. The linear axis
move must be longer than the rotary. I'd guess that EMC follows this
also, based on your findings.

Ballendo

P.S. anybody out there have a control that will process
this "correctly"? Doug R?

--- In CAD_CAM_EDM_DRO@y..., "Art Fenerty" <fenerty@h...> wrote:
> Jon:
>
> Yes, I was under the impression that a move like G01X.1A180
should ramp
> the 180 as it is the longest move. But in fact the system computes
the move
> of .1 in the X and "fits" the 180 degree change into that movement,
which
> causes A axis to lose pulses as it goes too fast. What if A is a
linear
> axis?
>
> Art
> Master5 Software
> http://users.andara.com/~fenerty/master.htm
>
> ----- Original Message -----
> From: "Jon Elson" <elson@p...>
> To: <CAD_CAM_EDM_DRO@y...>
> Sent: Thursday, January 31, 2002 2:02 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Re: EMC Contouring Settings/
downloading BDI
>
>
> > Art Fenerty wrote:
> >
> > > Hi All:
> > >
> > > I have an EMC question. Does a move like "G01 X .01 A180"
cause a
> servo
> > > fault or stepper motor race condition? The Math of my trajectory
> planner,
> > > which is based on EMC's exhibits this problem. I have performed
a fix to
> > > stop it for now, but I'm curious if EMC's trajectory planning
routines
> have
> > > the same bug. I'd appreciate someone with a rotary axis giving
this a
> try.
> > > You can actually see just from looking at the display that the
A takes
> off
> > > too fast so you don't really need a physical A-Axis to see it.
> >
> > Well, what is the feedrate? How, in fact, do you calculate the
feedrate
> > without knowing the radius of the object relative to the center
of the
> > A axis? The only way I can figure this out for EMC, is that you'd
> > manually have to figure out the acceptable time for the A axis to
> > move 180 degrees (I assume that is what you are doing) and then
> > compute a linear feedrate for the X axis that will take as long.
> > Assuming it takes 6 seconds for the A axis to turn 180 degrees,
> > the feedrate should be .1 (minute) * .01 (inches) = .001 IPM.
> > Is this the problem you are having?
> >
> > Jon
> >
> >
> > Addresses:
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