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

Hi Jon:

The specification may say what it wants, but it is not unusual to have
some people useing A to drive a linear rod or actuator or some such thing.
It may be rare, but CNC is growing so fast that the way its being used is
changing. It just didn't seem right to me, that the planner could allow an
axis A move to be pulses at that rate. The software should do a square sum
as Dave says, otherwise the A axis feedrate has to be factored into the
small X axis move as a percentage of that axis's move. Try to do the G0X .1
A 180 move under EMC and I suspect you'll get a servo fault or lost pulses
unless the feedrate is very low on the X axis. This should at least be
autocorrecting to the maximum frequency of the A axis just in case.
Just a thought.
Art
Master5 Software
http://users.andara.com/~fenerty/master.htm

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, February 02, 2002 2:21 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: EMC Contouring Settings/ downloading BDI


> Art Fenerty wrote:
>
> > 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.
>
> A is NEVER a linear axis. It is all clearly defined in the RS-274D
> specification.
> A B and C are rotary axes parallel to the X Y and Z axes, respectively.
> U V and W are auxilliary linear axes parallel to X Y and Z, respectively.
> So, if a vertical spindle is Z, the knee vertical motion would be W.
> A rotary axis parallel to the X axis would be the A axis. A plain
> rotary table would be the C axis. There are many more special purpose
> axis definitions in the spec, but these are the common ones.
>
> Jon
>
>
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