Re: [CAD_CAM_EDM_DRO] Re: EMC Contouring Settings/ downloading BDI

Thanks Ballendo:

Master5 will now correctly handle this type of move. It was just a
question of recalculating the feed rate automaticaly from the velocity and
acceleration settings of the A axis compared to the total move of the linear
axis. The problem actually was due to the calculation of the trajectory time
cycle being only tied to the X,Y,Z axis.
At least this way if someone wants to use A as a linear axis, there is no
problem.

Art
Master5 Software
http://users.andara.com/~fenerty/master.htm

----- Original Message -----
From: "ballendo" <ballendo@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, February 01, 2002 6:12 PM
Subject: [CAD_CAM_EDM_DRO] 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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> > > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > >
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> > > bill,
> > > List Manager
> > >
> > >
> > >
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> > >
> > >
>
>
> Addresses:
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>
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> bill,
> List Manager
>
>
>
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