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1
Hello and welcome!  Have you seen this page?  http://wiki.imal.org/howto/inkscape-and-lasercutter  Hopefully there is something there that will help.

Sadly, dxf files are very heavy on nodes for curves and there isn't much that you can do about it in Inkscape.
2
Hello. Thanks to all the people that help others in this forum.

I have a problem when exporting from Inkscape to a laser cutting file format (dxf, hpgl and plt).

I often import an image into Inkscape (jpg, png, etc.) and use Trace Bitmap to convert it to paths. Depending on the original image I use Brightness cutoff, Edge Detection or Colors (multiple scans) to trace the bitmap.

The laser cutter is a CamFive, and the software is SmartCarve 4.3. It takes dxf, hpgl or plt files.

I have Inkscape 0.92 on a windows 7 computer, and the Uniconvertor installed (https://sk1project.net/modules.php?name=Products&product=uniconvertor&op=download).

For this post I took an image (http://www.supercoloring.com/coloring-pages/toy-train) and traced the bitmap using Brightness cutoff, Edge Detection and Colors (multiple scans). Then, I exported to the 3 file formats (dxf, hpgl and plt).

When I import each file into SmartCarve I get this:


dxf format is very useful because I can use it with technical drawing software (LibreCAD).
hpgl looks clean but it has many small lines when you zoom in.
plt sometimes works well, but not always (also most of our computers at the school have linux based OS, and plt exporting is not working on those).

I use dxf more often, but then I have to cut lines and erase nodes on SmartCarve to clean the image.

Does anyone have an idea about what causes this problem, or about the solution?

Thank you all.

Here you can see the detail of each format:

DXF:


HPGL:


hpgl zoomed in:


PLT:
3
Another option, besides using auto-trace (Trace Bitmap) is to trace the image using the Pen/Bezier tool.  It depends on how much time you have, and how complicated the image is, as to whether you want to try tracing with Pen/Bezier tool or use auto-trace.
4
I don't know what method Carolyn used and she isn't online anymore.  Here are links to her blog and her Youtube channel so you can look around.  http://cuttwopieces.blogspot.com.au/ and https://www.youtube.com/user/cuttingtimes/videos

So after looking at her file I would guess that she used the node tool to delete a segment on each end of the original line, then used Path/Break apart so that she could delete the extra section.

5
A very short video showing what I do when I cannot delete a double line.

I couldn't use sound as hubby is watching tv and I was too lazy to walk out to my workroom. Plus it has been raining so if I went into a quiet room I would have a background sound of frogs and assorted bugs  <!-- s:lol: -->:lol:<!-- s:lol: -->

I have also attached the file I changed in the video.

 [ Invalid Attachment ]

[youtube:iy2506eu]Fn8i1QLA3v0[/youtube:iy2506eu]

Hi

We have the same issue.  A SVG file created from a scanned JPG, which has double lines.  I was hoping to watch your video as it looks like it could really 1help.  However, the link doesn't work and I couldn't find the video.

Please do you have the proper link or to some related help ?

Thanks

6
Help Using Inkscape / Re: Circle with notches
« Last post by gamanet on February 02, 2018, 04:58:00 AM »
Helllo brynn,

yes, you are absolutly right... it got much bigger than in my drafts... but when asking for help the dimensions weren´t that important for me... more important was to learn the main principle of working with inkscape and how to draw the stuff i needed... Right now i know and i´m reallly happy with the result...

It should become some kind of churn for extracting THC from Hemp-Plants... Around the construction i will put some silk-screen printing-sheet, and some raspberry will be used with a multiphase motor to keep the thing in motion (turning around slowly)...

With best regards,
Matthias
7
I'm glad you figured out the problem :)

Yes, I guess that's what happened with Adobe Illustrator.  You can't buy it at all anymore - only rent it.  I certainly would not have been happy, if I had been an Illustrator user.

Well, hopefully future Inkscape projects will go more smoothly.
8
Welcome to the forum!

This should answer your question:   https://inkscape.org/en/learn/faq/#inkscape-092-my-drawings-are-just-quarter-their-original-size-when-i-open-them-program-xyz

But if it doesn't, please ask for clarification.
9
Help Using Inkscape / Re: Need help on jpg to dxf conversion (for Lazycam).
« Last post by pawl on January 25, 2018, 11:17:31 PM »
Hi Brynn,

I'll get to a longer reply re where the cutting ended up (or is ending up), but suffice to say they began the cutting once again yesterday and continued with it today. The problem areas were limited this time to the details of the trees, as might have been expected. I'd hoped that the plate was thin enough to accommodate their machine, but alas, not the case. Still so much to learn. One of the guys on that end said I need to make sure the file is made up of polylines, which was one of the things I did earlier this week. I've been trying so many things that I've not been able to keep track of them. Like a chef who has baked an elaborate dish and will not be able to retrace the steps to repeat the result.

Anyway, I'm glad to set it aside for a few weeks. I'll be sure to post pics of the finished products (the gates). And, for the next project that will need cutting, prepare to study more in hopes to find the straightest path from a to b.

Thanks again,

Paul
10
Help Using Inkscape / Re: Need help on jpg to dxf conversion (for Lazycam).
« Last post by brynn on January 25, 2018, 11:06:35 PM »
—————Strange, but I can see the break in the rocks, but when I zoom in, it grows ever smaller and then I can only see one node to select, not two that could be joined.

Very strange!  That seems to be some kind of display anomaly.  As far as I can tell, the path is connected there.  It should cut without any problem. 

But the place where the trees meet the arch on the left, I think the path is really broken there.  I have to zoom to approx 250% before I start to see it.  But then I would zoom much more to see the nodes well enough.

While you can drag a selection box, to select the 2 end nodes, in this case, you'd end up selecting 3 nodes (because 2 are very close together.  I'm not sure what Inkscape would do if you tried to join 3 selected nodes.  It might work anyway.  But if it doesn't, you'll have to zoom far enough to see them (well enough to select them).
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