Re: [CAD_CAM_EDM_DRO] Open source CNC buffer [Was: Whither goest DOS?]

----- Original Message -----
From: "Luc Vercruysse" <luc.vercruysse@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, January 24, 2002 7:53 PM
Subject: Re: [CAD_CAM_EDM_DRO] Open source CNC buffer [Was: Whither goest
DOS?]


> Hi
> I have the same idea. I have separated the motion planner, interpolation
and
> PID routines (only for DC motor) fom the EMC controller ready to compile
> with borland C++.
> I had the idea to run the G-code interpreter and the motion planner in a
> windows box and connect it through a serial connection with a
> operatingsystemless board . That board does the interpolation and PID
> calculations. I tried to run the interpolator on a 80188-20MHz system, but
> it is too slow as it has to do a lot of floating point calculations...I
> think there are 3 solutions
> 1. Have a board with a math processor (or at least a I486) that runs the
> interpolation part + PID.
> 2. Convert all routines to fixed point (wich I have done already for the
> PID functions)
> 3. Move the interpolation part to the windows box. As windows is not a RT
> operating system and there is a lot of information (calculated positions)
> that has to be sended over the serial line, this solution would be to
slow.
>
> I am still looking for the best solution ...
>
>
> Luc.
>
>
>
> > Interesting, I had reached the same conclusion that a
> > fairly inexpensive microcontroller could be used to
> > allow the software such EMC without requiring a real
> > time operating system (e.g. RT Linux) or running on
> > raw hardware (DOS model.)
> >
> > The system that I am designing has a motion board that
> > uses the EMC step and direction pinouts. In addition,
> > there is a buffer board that takes RS-232 in one end
> > and wiggles the step and direction lines appropriately.
> > The designs are not complete yet, but people are welcome
> > to look over my shoulder and kabitz:
> >
> > http://web.gramlich.net/projects/cnc/controller/index.html
> >
> > Currently, all of my hardware projects are "open source
> > hardware" projects where both the hardware and associated
> > embedded software are freely available.
> >
> > -Wayne
> >
>
>