Posted by LordOfBikes on Nov 26, 2014; 9:55am
URL: https://forum.librecad.org/How-to-change-units-from-inches-to-mm-tp5710754p5710758.html

That depends on what you aim to do with your drawing. In drawing units the length of the line is still 1.0, but the dimension value shows 25.4. For printing you have to use a appropriate factor too, matching the drawing units, not the dimension units. For printing only, this might be OK.

Also the line thickness is influenced by this. I think thats the reason for the thick black lines in your screen shot. To avoid this you have to change units and scale the drawing.

If you want to use the drawing with a CAM system for CNC machining, you probably must scale the drawing too, that the line is 25.4 drawing units with a General Factor of 1. That depends on the features and units of the CAM system.

Armin