Here's Brian's post, as it came through this end of the email pipe:
» » »
Subject: Re: New dialects [Was: Do CAM instead? ]
Yes, much more readable. The downside is that you can't do a "restart at
> line" without specifying which iteration of the outer loop to restart
> from. And neither the GUIs nor the "runtime" support that.
>
For me, I simply go back to the oword call and rerun the particular
string. I am a hobbyist so its ok for it to cut air for several passes
until it gets back to the particular Z depth where it was stopped.
Brian
« « «
All of the first three lines of text are actually a quote of Kenneth
Lerman's prior post. So let's go with this understanding:
On 11.02.12 11:57, BRIAN GLACKIN wrote:
> Before that, Kenneth Lerman wrote:
> > Yes, much more readable. The downside is that you can't do a "restart at
> > line" without specifying which iteration of the outer loop to restart
> > from. And neither the GUIs nor the "runtime" support that.
> >
>
> For me, I simply go back to the oword call and rerun the particular
> string. I am a hobbyist so its ok for it to cut air for several passes
> until it gets back to the particular Z depth where it was stopped.
I'll drink to that, if we're only talking about a few passes over a
short toolpath, on an amateur job.
But there is a way to get the best of both worlds. A gcode filter
program can unroll e.g. a 20-iteration loop programmed in the input
source, so that it is passed on to LinuxCNC as 20 consecutive copies of
the loop, with individual values inserted for each run. The iteration
number can be added in comments, for good measure. Now we can "restart
at line", anywhere we choose, because AXIS isn't given any loops to deal
with.
I haven't yet thought through exactly how much work it is, but unrolling
one loop (so there's one variable to increment and substitute) isn't too
bad, except for the trick of feeding the loop gcode back through the
filter again. One option is to just do it in the lexer, keeping
everything within a single process. (Fortunately, flex has a mechanism
we could use.)
It is an interesting task, and if it is of significant use, then it's
something to add to the list of things to do.
Erik
--
Behavioural psychology is the science of pulling habits out of rats.
- Dr. Douglas Busch
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