RE: [CAD_CAM_EDM_DRO] Re: CNC Controllers

Jen,

Welcome to the CAD_CAM list. Glad you made it over from the LETBasic list.

You should take a look at EMC if you are determined to roll your own. EMC is
a project of the NIST and as a government agency it is freely available. It
is written in C and all the source code is also available. It is fairly
modular the interpreter, trajectory planner, etc are all separate pieces. I
would start with http://www.linuxcnc.org/ This is probably going to be the
best source of examples you will find. There is also a windows based
controller called Stepster that has open source code you may want to look at
. It is nowhere near what EMC offers, but is worth looking at for code
ideas. I don't have the URL, but I am sure someone will help us with that.

Tim
[Denver, CO]

> 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.