Trouble with svg export

I have a workflow whereby I use Lightburn to import a large (area) pdf. I then break the imported parts down to the specific ones I want and export (part by part) an svg of each part. I then move to my 3d cad program and import the svg into my modeling sketch. Once I have made the required mods to the part(s) I will take them back to Lightburn via dxf and cut them on my laser.
Problem: The exported svg, imports as a very small figure, and the 3d cad cannot diagonally scale it back to the required full scale size. Even a simple square of 75mm from Lightburn, imports as a 1.984375mm square in my cad program. A square I can fix easily in my cad, but compound curves - not so.

I can successfully do this by exporting a dxf file from Lightburn and taking that into CorelDRAW, and then exporting an svg from CorelDRAW - but this is quite cumbersome.

My sense is that something is missing in the svg file export by Lightburn, while the dxf export works perfectly (but I have no facility to import dxf into my cad sketch process, only svg (: ).

is the svg export fixable?
thanks
Mike

75mm square test export svg
75mm square test export.lbrn2 (2.9 KB)
Above are the two files for the 75 mm square: 2nd file is the square in my Lightburn space
and the first file is the resultant export of the svg.


This last file is a screenshot of the cad program showing the 75mm square coming in as 1.98…mm

as stated earlier - fixing the square in cad is trivial, but not compound curves.
thx

I’ve opened your LB file and exported it as SVG. Here’s what I get when I import into various applications…

In CorelDraw 2018:

In Affinity Designer:

Inkscape:

image

I also tried it in Fusion 360 but that came in at 19.844mm:

image

So with most applications I tried it came in at the correct size. I had a look at the SVG in a text editor and some of the values are specified as mm and others have no units (I don’t know whether that’s the cause of the issue).

Thanks for that.

So far:
Your input into a CAD program brings it in wrong, likewise my import into Alibre brings it in wrong. maybe “wrong”?

what is puzzling is that if I go via coreldraw to get the svg, then import it into Alibre - it is correctly imported into the cad program.

a real puzzle…

mike

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