New to inkscape.  I am using it along with JSCut Inlay Assistant (which creates gcodes from the svg file)  for creating inlay's and inlay recesses for my homebuilt guitar headstocks and fretboards using a CNC with Candle software. Had great success creating logos with text, but when I tried to import jpegs of a design into Inkscape and then use the auto trace function to create a new design, the resulting gcodes generated by JSCut were incorrectly sized.  The inlay was too big and the recess too small. I had the gut reaction that the design was inside out.  Anyone have a clue as to what is going on?  I'm sure its a result of the trace function but can't see how to fix this. Thanks

imported jpegs are just not scaled to anything.  Make a box that is the size you want, then scale you image to that.  The size the jpeg is in Inkscape makes a difference in how it vectors the design.  I prefer tracing transparent pngs, but thats not always possible.

It's been over 10 years but I did some CNC and found the easiest was to make the line thickness same as the bit, also make the line ends and corners rounded.  I would overlay that on the image and make sure that outline turned out correctly.  Then export and the software just sees the line.

Maybe you know all this already, just describing the workflow I used.  For many items now that I could autotrace instead I draw them from scratch over the imported image.  I'm usually making them about 12ft tall, so every node out of place makes a difference.