DXF for cut and engrave
And we all seem to have made 45 posts.
The forum has never really worked properly. I stick to the mailing list.
On Mon, 21 Oct 2019 at 22:01, kitwallace via Discuss <
discuss@lists.openscad.org> wrote:
Not sure how you could engrave a open area?
and why have we gone all anonymous?
kitwallace
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How I do this: I make each color a separate object. So, one cut object, one
engrave object in most cases. Then, I export them separately, stack them in
Lightburn, and then set the settings for each color and burn.
To make it easier to see while working in OpenSCAD, I offset the cut layer 1
mm in Z.
It would be nice if it could be done simpler, but this is the best way I
found.
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In my current project on fractal patterns, both the cut outlines and the
curves to be engraved are closed paths so the difference() {outline;engrave}
trick seems to work, both to preview the design and to create a single DXF
and then into (on our laser cutter) Lasercut 5.3
In a previous project to laser cut the net of a polyhedra from card with the
interior edges scored, to get actual, coloured lines, I had to resort to
generating SVG as a string output to the console to copy into Inkscape to
convert to DXF - it would have been good to have been able to output that
text directly to a file but I never found out how to.
kit
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I'm a little surprised that there isn't a 2D equivalent to OpenSCAD -
basically, a 2D vector drawing program that executes a program to create
the drawing. Yes, I know that Inkscape (and probably others) allows
Python plug-ins, but that's not the same as having an editor window and
a "run" button.
Kinda like Logo? https://en.wikipedia.org/wiki/Logo_(programming_language)
On 10/22/19 12:17 PM, Jordan Brown via Discuss wrote:
I'm a little surprised that there isn't a 2D equivalent to OpenSCAD -
basically, a 2D vector drawing program that executes a program to
create the drawing. Yes, I know that Inkscape (and probably others)
allows Python plug-ins, but that's not the same as having an editor
window and a "run" button.
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On Tue, Oct 22, 2019 at 11:10:03AM -0700, WillAdams via Discuss wrote:
There are a number of programs/tools in this space (2D programmatic drawing):
I have probably missed part of this discussion, but for me: I use
openscad to design a box for a project in 3D and then I lay the pieces
flat and send the outline to be laser-cut. One popular box has a few
markings for the buttons. I can test-fit the design in openscad and
the current processing towards something for the laser-cutting-service
is too long and error prone. I'd much rather hit "export" in openscad
and that's that. But now there are a few more steps to add the
engravings in another program. (this "too difficult" has resulted in
problems that we'd fixed by adjusting an intermediate file, getting
overwritten so that we got an old problem back).
Roger.
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** R.E.Wolff@BitWizard.nl ** https://www.BitWizard.nl/ ** +31-15-2049110 **
** Delftechpark 11 2628 XJ Delft, The Netherlands. KVK: 27239233 **
The plan was simple, like my brother-in-law Phil. But unlike
Phil, this plan just might work.
There are a number of programs/tools in this space (2D programmatic drawing):
- METAPOST --- one of the oldest, and the current versions allow one to
create an SVG directly --- I set up a TeX editor such as TeXmaker and use an
image previewer such as nomacs - Processing --- popular and well-supported and the subject of a number of
books - NodeBox --- originally more popular on the Mac there is now a nice
Windows implementation - Asymptote --- front-end to METAPOST
- https://archives.haskell.org/projects.haskell.org/diagrams/
William
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OpenSCAD mailing list wrote
On Tue, Oct 22, 2019 at 11:10:03AM -0700, WillAdams via Discuss wrote:
I have probably missed part of this discussion, but for me: I use
openscad to design a box for a project in 3D and then I lay the pieces
flat and send the outline to be laser-cut.
OpenSCAD is heavily oriented towards 3D-printing, and, to some extent,
leaves us laser cutter guys out in the cold, or at least requiring us to
make irritating workarounds.
For example, a line is useless in 3D-printing, but extremely useful in laser
cutting (google "living hinge" for a good example).
I really hope that considerations for laser cuttings will enter into the
plan for OpenSCAD, it would mean a lot to us. 3D-printing is just too slow,
has too small work area and too limited in materials available to be useful
for me.
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The problem is a laser doesn't cut a line with zero thickness but people
pretend it does.
You can model any object a laser can produce in OpenSCAD. What is needed is
a CAM stage for lasers that creates the tool path, just as 3D printing and
milling. For some reason the CAM stage is ignored when laser cutting.
On Thu, 24 Oct 2019 at 09:39, Troberg troberg.anders@gmail.com wrote:
OpenSCAD mailing list wrote
On Tue, Oct 22, 2019 at 11:10:03AM -0700, WillAdams via Discuss wrote:
I have probably missed part of this discussion, but for me: I use
openscad to design a box for a project in 3D and then I lay the pieces
flat and send the outline to be laser-cut.
OpenSCAD is heavily oriented towards 3D-printing, and, to some extent,
leaves us laser cutter guys out in the cold, or at least requiring us to
make irritating workarounds.
For example, a line is useless in 3D-printing, but extremely useful in
laser
cutting (google "living hinge" for a good example).
I really hope that considerations for laser cuttings will enter into the
plan for OpenSCAD, it would mean a lot to us. 3D-printing is just too slow,
has too small work area and too limited in materials available to be useful
for me.
--
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On Thu, Oct 24, 2019 at 10:56:15AM +0100, nop head wrote:
The problem is a laser doesn't cut a line with zero thickness but people
pretend it does.
You can model any object a laser can produce in OpenSCAD. What is needed is
a CAM stage for lasers that creates the tool path, just as 3D printing and
milling. For some reason the CAM stage is ignored when laser cutting.
The CAM stage traditionally happens in the printer driver under
windows. A program, ANY program tells windows it wants to print
something. Then together with some confguration, the printer driver
translates e.g. the color of the line into different commands for the
laser (say: red: "all the way through at 100% laser power and 10%
speed, blue: "just a scorched line at 50% laser power and 100%
speed", green: "engraved in bitmap mode").
The problem is that with those things tightly coupled to the laser
device in question, and them being closed source, it is difficult to
optimize those things. For example, at my friends' the laser will
easily cut up a single "rounded box" outline into 4 lines and for
quarter-circles and do them in the woarst possible order you can
imagine.
Optimizing the toolpath is equivalent to the travelling salesman
problem and therefore NP complete. But that doesn't mean you can't do
a meaningful optimization. An easy optimization (that 3D printer
slicers should also do!) would be to always pick the closest
linesegment. In the rounded-box example that immediately leads to the
optimal solution. Then as a post processing step, investigate the
longest non-cutting moves and see if you can improve on them. Take a
segment between two long-moves and try to insert it in the path
somewhere to see if the total non-cutting path length can be reduced.
Sorry for my rant.
Roger.
On Thu, 24 Oct 2019 at 09:39, Troberg troberg.anders@gmail.com wrote:
OpenSCAD mailing list wrote
On Tue, Oct 22, 2019 at 11:10:03AM -0700, WillAdams via Discuss wrote:
I have probably missed part of this discussion, but for me: I use
openscad to design a box for a project in 3D and then I lay the pieces
flat and send the outline to be laser-cut.
OpenSCAD is heavily oriented towards 3D-printing, and, to some extent,
leaves us laser cutter guys out in the cold, or at least requiring us to
make irritating workarounds.
For example, a line is useless in 3D-printing, but extremely useful in
laser
cutting (google "living hinge" for a good example).
I really hope that considerations for laser cuttings will enter into the
plan for OpenSCAD, it would mean a lot to us. 3D-printing is just too slow,
has too small work area and too limited in materials available to be useful
for me.
--
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Discuss@lists.openscad.org
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OpenSCAD mailing list
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--
** R.E.Wolff@BitWizard.nl ** https://www.BitWizard.nl/ ** +31-15-2049110 **
** Delftechpark 11 2628 XJ Delft, The Netherlands. KVK: 27239233 **
The plan was simple, like my brother-in-law Phil. But unlike
Phil, this plan just might work.