I already talk about why I can not use slicing program .
If one can do change to existing slicing software then I am interesting to
talk.

All new thing can be multidisciplinary.
That is why I only taking very specific nerrow subject.




On Mar 11, 2018 12:17 PM, "Chris Albertson" <albertson.ch...@gmail.com>
wrote:

> It sounds like you are considering reversing the tool path of an
> additive machine.   That can't work.  The tool end would have to pass
> through solid material.
>
> If the goal is to have your additive machine create different surface
> properties for material near the edges then this is typically done in
> the slicer software.   All slicers to this.  They lay down the
> material that can be seen and touched differently from the material
> inside the part.     The simplest example is "infill".  All slicers
> can creat low density infill.  Another example is what they call
> "ironing" where they move the hot extruder over the exterior surface
> while not extruding any more plastic.  The hot metal flattens out any
> bumps.   It should be possible to add other surface treatments to the
> slicer software.
>
>
> On Sun, Mar 11, 2018 at 5:36 AM, Gene Heskett <ghesk...@shentel.net>
> wrote:
> > On Sunday 11 March 2018 05:54:08 Andy Pugh wrote:
> >
> >> > On 11 Mar 2018, at 06:03, a k <pccncmach...@gmail.com> wrote:
> >> >
> >> > i want reverse tool path.
> >>
> >> No, you don’t.
> >>
> >> A reversed tool path will still put the tool outside the part
> >> material.
> >>
> >> Just use a 3D printer slicer and configure your machine with a dummy
> >> extruder axis that does nothing.
> >
> > That to me, still doesn't quite get the job done. He needs to hook up the
> > extruders wire feed to the plastic feed, and some way to turn off the
> > fire when jumping across an opening in the pattern, and restarting the
> > fire when its moved across the empty opening. The fact that the machine
> > can lay down a much thicker line of metal in one pass than the 3d
> > printer can should just be a matter of programming the slicer for a
> > thicker slice. In fact it may be worthwhile in reduced "finishing" work
> > to design a new smaller "extruder like" mechanism to handle say .015"
> > diameter wire, as that would reduce the final pass to size to a single
> > pass, possibly with EDM if its a thin walled and easily distorted item..
> >
> > It might even be helpfull to replace the drive motor on the "extruder"
> > with a reverseable motor so that the wire can be withdrawn far enough to
> > extinguish the arc. The rest of this I see as a hal file composition
> > exercise, hooking up SSR's to control the arc, and some sort of a THC
> > like arc starter. In fact, let the THC output control the x/y feed speed
> > as a way of laying down a consistent thickness of metal.
> >
> > It would also be a good idea to have the workspace flooded with the near
> > inert CO2/Argon atmosphere. The CO2 adds carbon to the puddle, making
> > the resultant metal layer much harder than straight argon by itself
> > would. It wouldn't matter if it leaked, as long as the working envelope
> > was flooded to keep slag at bay because that would make the arc restart
> > simply a matter of fireing the SSR and extending the wire until contact
> > was made again, letting a feedhold hold the starting position until the
> > arc was started, long enough to make sure the metal was being
> > transferred. The flooding gas would ensure a clean, oxide free
> > interface, making the arc so much easier to restart you'd wonder why you
> > ever bothered trying w/o it. The initial startup might need a delay
> > after gas turnon to assure its well flooded else the weld would slag
> > over once the head had moved on, at least long enough for the weld to
> > cool.
> >
> > Or perhaps I don't fully understand the problem.  Its certainly something
> > LinuxCNC can do once the slicer has created the laydown paths from the
> > 3d model.
> >
> > Aram hasn't given us any hint at how big the working envelope of the 3d
> > metal printer might have to be as that will determine the gas economics.
> > In the size bottles I use, a big box can get expen$ive to flood.
> >
> > --
> > Cheers, Gene Heskett
> > --
> > "There are four boxes to be used in defense of liberty:
> >  soap, ballot, jury, and ammo. Please use in that order."
> > -Ed Howdershelt (Author)
> > Genes Web page <http://geneslinuxbox.net:6309/gene>
> >
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>
>
> --
>
> Chris Albertson
> Redondo Beach, California
>
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