CNC Controllers

Hi everyone,

My partner has desided to build a CNC router and the hardware site seems
fine, but we'd like to drive it from some of the industry standard S/W like
signlab, etc. without the large expense of an industry controller.

That's where I come in.

I'm a programmer by trade so I'm trying to put together a program that can
read HPGL and output step/directoion for the stepper boards. I'm
prototyping in good old basic so I only have to worry about the logic, not
the code, but I'm getting a few teething troubles.

So has anybody out there got any routines for handling linear interpolation
and ramping. I think I've got the linear interpolation nearly sorted but
the code is a little cludgy and at the moment it adds 1 extra step onto the
primary axis (whichever one is doing the most steps in this move), but I'm
not sure how to handle the ramping.


Any help at at all would be greatly appreciated.




Jen.