On Monday 04 November 2013 08:05:25 andy pugh did opine:
> On 4 November 2013 08:33, Marcus Bowman
>
> <[email protected]> wrote:
> > First, I am using a font describable using only X and Y linear moves,
> > so I am not using G2 or G3 commands.
>
> This is what I have ended up doing. (Though I haven't tried any actual
> machining yet).
>
> One small quirk is that I defined my own fonts as G-code subs inside
> the routine.
> The font is based on two octagons, I need to try actual engraving to
> see if that ends up looking too angular, but it looks OK in the G-code
> preview.
>
> (Surprised that this thread is still getting replies 3 days after I
> published my own code with a solution)
The method I described is very similar to that, but I must be missing
something when you say you can't use a pretty font. As long as LCNC thinks
its working in any 2 of XYZ planes by just temporarily swapping the drive
cables, you should be able to use any font on the menu. That would of
course demand a table connected to X or Y with near zero backlash, or
mapped compensation using two maps and a dual switched home indication.
I doubt if I could pull it off with my $100 4", not without first cleaning
it up, making a very wet paste of dico "stainless" to coat the worm with,
and running it for a week or so, driving the worm engagement screw another
10 degrees a day. It has run out in both the bull gear and the worm. A
harmonic drive table would be ideal of course, or one of the cycloid
drives, but I fail to see how one could compensate for wear of the output
shaft pins in the cycloid, whereas the bearing driving the bend in the
harmonic drive could be made adjustable quite easily.
Or I assume it would be possible to 'map' the backlash in this table, but I
haven't had enough interest in the how of it to even ask, because first I
would have to trade out the 3 jaw chuck on it now for a 4 jaw so the work
could be truly centered, something I miss on by at least 10 thou. What I
commonly use it for right now is to set angles for sharpening stuff with
one of the large dremel diamond wheels in the spindle. For that, its more
than "good enough for the girls I go with". ;-)
And yeah, I dream a lot. Goes with the years. And the crew is arriving to
ditch in the gas line for my generator, so I assume I should go observe.
Basically to see how much damage to a 45' pine trees roots the ditching
will do, as that will probably make me call someone to take it down since
it will do major damage if it just "comes down". They said they would try
to tunnel through it. We will see...
Later...
Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
The sooner you fall behind, the more time you have to catch up.
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
law-abiding citizens.
------------------------------------------------------------------------------
Android is increasing in popularity, but the open development platform that
developers love is also attractive to malware creators. Download this white
paper to learn more about secure code signing practices that can help keep
Android apps secure.
http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk
_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
