Posted by mattz40 on Aug 09, 2021; 9:58pm
URL: https://forum.librecad.org/Trouble-with-scaling-tp5720910.html

I'm very new to LibreCAD which will be obvious I'm sure. I've read all I can find on scaling but I still can't make sense of it.
I have a part I need to make a copy of, with a modification. It's a flat plate with a couple holes and a slot. I need to add a couple more holes that are further out from the 'center' of the plate, beyond the current edge of that plate which will require enlarging the plate once I have the additional holes placed.
I've traced the part with paper and pencil, scanned it, imported it into LibreCAD and traced it there. When I show the properties of what should be a 0.4" circle, it shows as having a radius of 112 what I think are millimeters (properties seems to show millimeters regardless of how units are set in preferences), which is almost 9".
I set the scale set to 1, which implies a 1:1 scale before I began, yet tracing a 1:1 image resulted in this aberration.
The problem is that I need the drawing to be at a 1:1 scale. I have the polar coordinates of where the additional holes need to be placed. While I can get the angle correct regardless of scale, I can't get the distance from the center of an existing hole correct without having the drawing at a 1:1 scale.

How can I set the scale of the drawing to match the actual size of the part? I need to resize the entire entity, not the printing of it.