I can create a helix by putting a line on a cylindrical surface... the
problem is how to go from 3d points to the correct coordinates in 2d space
on the cylindrical surface. I am banging my head on this wall, but have yet
to create any cracks. :)
Mark
On Tue, Mar 3, 2009 at 6:41 PM, EBo <[email protected]> wrote:
> Stephen,
>
> Thanks for the correction.
>
> EBo --
>
>
> Stephen Wille Padnos <[email protected]> said:
>
> > EBo wrote:
> >
> > >Mark,
> > >
> > >It would help to tell us what you are trying to accomplish. From your
> last
> > >statement:
> > >
> > >
> > >>Now I just have to figure out how to draw a helix...
> > >>
> > >>
> > >
> > >The problem that I see is that you might not be able to get there from
> arc's
> > >and might have to approximate arcs as lines only. The issue is that
> g02/03
> > >(arcs) are assumed to be planar -- which means you cannot get there from
> where
> > >you are.
> > >
> >
> > What you can't do is an arbitrary helix, or an arbitrary arc for that
> > matter. Only plane-aligned arcs are allowed at the moment, which turn
> > into plane-aligned helixes if you also move in the perpendicular axis.
> >
> > - Steve
> >
> > > If there is some way to generate an arc that also moves in another
> > >dimension/axis then you will have to account for that and can actually
> > >generate a helix. Maybe I am just missing the point from skimming this
> > >thread, but I'm getting the feeling that something is a little off...
> > >
> > >BTW, this is one of the reasons that I advocated NURBs years ago since a
> helix
> > >can be generated by skewing the control polygon of a circle.
> > >
> > > EBo --
> > >
> > >
> > >Mark <[email protected]> said:
> > >
> > >
> > >
> > >>--0016362834ee85fb7f04643b1f21
> > >>Content-Type: text/plain; charset=ISO-8859-1
> > >>Content-Transfer-Encoding: 7bit
> > >>
> > >>Thanks. For right now, I'll stick with the SAI output, since I'm
> already
> > >>using it.
> > >>I tried to find the functions (ARC_FEED etc) before, but whatever
> string I
> > >>searched for only showed up in emccannon.cc - which doesn't have the
> > >>printf's.
> > >>
> > >>Does the interpreter take care of offsets, cutter radius compensation,
> etc,
> > >>or is that taken care of somewhere else? I see functions in test.cc
> related
> > >>to both, but I am wishing really, reeeeally hard that it's taken care
> of for
> > >>me :)
> > >>
> > >>I just remembered gdepth. I will take a look at it. I'm trying to do
> about
> > >>the same thing, only using Open Cascade. I hope the accuracy will be
> high
> > >>enough to compare the volume of the model generated from g-code with
> the
> > >>volume of the original model, to see if there are differences.
> > >>
> > >>Now I just have to figure out how to draw a helix...
> > >>
> > >>Mark
> > >>
> > >>On Tue, Mar 3, 2009 at 12:36 PM, Alexey Starikovskiy
> <[email protected]>wrote:
> > >>
> > >>
> > >>>You may insert code into ARC_FEED/STRAIT_FEED of the attached program.
> > >>>command line to compile it (put your paths to emc source):
> > >>>g++ -I../x/emc2-trunk/include/ -L../x/emc2-trunk/lib/
> > >>>-R../x/emc2-trunk/lib/ -lrs274 -lemcini test.cc -o t
> > >>>
> > >>>Mark wrote:
> > >>>
> > >>>
> > >>>>What I want is a way to get lines and arcs from a gcode file.
> > >>>>
> > >>>>Question: if changes are made to the main interp, do they propagate
> to the
> > >>>>Axis version or must the Axis version be edited by hand?
> > >>>>
> > >>>>Mark
> > >>>>
> > >>>>On Tue, Mar 3, 2009 at 11:55 AM, Jeff Epler <[email protected]>
> > >>>>wrote:
> > >>>>
> > >>>>
> >
> >
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>
>
> --
>
>
>
>
>
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