Re: [CAD_CAM_EDM_DRO] Re: Question about angular and linear feedrates

TurboCNC is set up for the feedrate of a rotary axis to be in degrees per
second, so that helps a little bit.

Dan.

----- Original Message -----
From: "alenz2002" <alenz@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, August 04, 2002 12:24 AM
Subject: [CAD_CAM_EDM_DRO] Re: Question about angular and linear feedrates


> Dan,
> I have been wondering the same thing. I use CNCpro and in your
> example, it would take 30 sec. If there is an X (or Y or Z) and A in
> the same block, it will set the feedrate based on the X and try to
> force the A to complete it's move in the same length of time. If the
> A is a large value and the X is small then it will try to run the A
> at some astromical speed. However, if there is no X (only an A) then
> it uses the F value as Deg/Min, not Deg/Sec,(although you can select
> either Deg/Min or Deg/Sec for the display). That is a whole new
> problem.
> For example, on my Sherline, 5 In/Min will turn the X stepper 100
> RPM, but 5 Deg/Min is 1 RPM. That is the equivalent to listening to
> your watch tick, not usable.
> I ended up writing a little routine to calc a new feedrate for each
> block. Deterine the length of the actual vector and then calc the
> feedrate based on the X component, if there is one. If not use
> Deg/min units for the rotary. It mostly works, but requires that the
> origin (0,0) be at the center of the rotary, (to find the radius) and
> can't use G02, G03, etc., only G00 and G01. I don't know what effect
> this (a feedrate in each block) has on such things as accel,decel,
> constant contour, etc.
> I am going to hate myself if it turns out that there is an easier way
> using some of the software that I already have and don't know how to
> use:)
>
> Cheers,
> Al Lenz
>
>
> > "Dan Statman" <dan.statman@r...> wrote:
> > I would like to know how most (all) control programs will handle the
> > feedrate for the following moves:
> >
> > A-axis is angular with feedrate expressed in degrees/sec
> > X-axis is linear with feedrate expressed in inches/min
> >
> > Assume that I am always starting at X0 and A0 for these moves.
> >
> > If I command: G01 A180 F1.0 it should take 180 seconds to make the
> move.
> > If I command: G01 X0.5 F1.0 it should take 30 seconds to make the
> move.
> >
> > My question is how long should the following move take starting at
> A0 X0:
> >
> > G01 A180 X0.5 F1.0
> >
> > Does it take 30 seconds or 180 seconds?
> >
> > Thank youf or your help.
> >
> > Daniel J. Statman, Statman Designs
> > www.statmandesigns.com
>
>
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