Re: [CAD_CAM_EDM_DRO] Bridgeport CNC Mill???

David G. LeVine wrote:

> Since the Mesa stuff (and I only chose that as an example) can do most
> of this in the FPGA, EMC2's speed is not a question.

Well, no. Both the Mesa and Pico Systems boards close the servo loop in
the PC, at
least when using EMC2.

> It is not normally
> significant if there is a 1 mS delay between the end of one move and the
> start of the next EXCEPT when doing cuts with many straight line
> segments.

Well, even still, if you are doing close to 1000 vector segments per
second, that is
a really hard thing to do, and it may be more due to a poor G-code
program in many
cases than an actual need to break the path in that many segments. I do
have a torture
test that I set up for EMC2 to find out how many G-code blocks it could
handle.
It consists of a 3" diameter circle broken into 10,000 G01 vectors. It
handles it
in about 13 seconds, so better than 750 vectors/second. That test was
performed on
a 600 MHz Pentium III, so it will do even better on a faster computer.

Jon