RE: [CAD_CAM_EDM_DRO] Windows PC as CNC controller

Hi Lawrence,

Here's what I would suggest. Pick an embedded processor like a TI DSP
TMS320F2808 or an ARM or something that runs in the 100+ MHz range. Then
program it to do the moves toggling a parallel port. Send it the moves via
USB or Ethernet.

The alternative is to pick a PC motherboard and install real time Linux on
it and use it as TCP/IP receptacle for your movement commands and have it
toggle the hardware ports.

In either case, remove yourself from Windows for anything but the user
interface. In the long run it will save you a bunch of grief.

John Dammeyer

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Lawrence Gran
> Sent: Wednesday, October 11, 2006 5:44 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Windows PC as CNC controller
>
>
> Thank you all for your response. I see that more detail
> would be useful.
>
> >Why bother re-inventing the wheel when it has already been
> done rather well
> with TurboCNC or Mach 1, 2 or 3?
> >Unless of course you are doing just for fun.
>
> Well, it IS fun, but I'm trying to design a machine that is
> more of a leg,
> than a wheel. Among others things, I'm using struts for the
> XY plane. Who
> can control struts?
> Mach will not handle struts for XY. Is that Right?
> TurboCNC is priced right. I already have TurboCNC, and am
> running it on a
> traditional 3-axis mill. It won't do, because I'm spoiled by
> FlashCut,
> which has a lot of useful graphics.
> EMC has addressed the Stewart machine - this is a fact. But
> waiting until a
> Linux machine is avail to sort that out.
>
> Windows interrupt rate of 1.2Mhz is kind of funny.
> Apparantly windows give
> you the choice of 10ms or 0.8 microsecond interrupts. Of
> course, 1.2Mhz is
> much to fast to do serious calculation, but you can run a
> counter to divide
> it down to something more useful, then launch a ISR of your
> own. The Tridea
> 2axis drafting machine ran quite smoothly and quickly on 120
> Hz interrupts
> which was derived by zero-crossings on the AC power.
>
> But I haven't seen any stepper motor drivers which take
> velocity and return
> position. Have you?
>
>
>
>
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