RE: [CAD_CAM_EDM_DRO] Windows PC as CNC controller

Hi,

Anyway, I'm assuming you have already heard of TurboCNC or MACH2/3. If
not, you will with other responses to your posting.

I have a question though. Assuming you have heard of the above, would you
outline exactly what it is about those packages that you don't like that you
would improve upon?

The kernel program you are talking about is called a device driver. Having
developed a few for WIN-NT 3.5, 3.51 and NT 4.0 I can tell you it's both
trivial and not. In other words, once you know how, it's not all that
difficult but getting to that point from startup can take about six months.
Debugging is accomplished with a second PC connected via network and allows
single stepping through the device driver.

Having written the code for the Electronic Leadscrew running on a PIC I can
also tell you that the code for co-ordinated motion resulting in stepping
pulses can also be quite complicated but can drive micro-steppers at a
suitable speed with a 25kHz interrupt rate.

So would you explain why you feel you need 1.2MHz? There's no way I could
do that rate with a 40Mhz PIC and I've heard that someone has even developed
a 3 axis control system with co-ordinated motion using a 20MHz PIC; which
impresses me to no end.

Regards

John Dammeyer

>
> I would like to develop new CNC controller based on the PC. Using
> Windows seems ok, Being more familiar with Windows than
> Linux. I figure
> these new PCs run so fast that they must be able to stay ahead of a
> mechanical cutting device.
>
> Does anyone out there know how to build a kernal program that
> will stay
> in memory, be started at the 1200000 interrupt rate, and communicate
> directly with the printer port, and with my controller via a queue of
> data?
>
> I am driving the parallel port through a XYLOTEX into an
> tabletop mill
> (as of yesterday), but there is no kind of timing being attempted.
>
>
>
>
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