Posted by georgesbasement on Aug 09, 2017; 1:50pm
URL: https://forum.librecad.org/Trimming-unwanted-arcs-from-a-circle-tp5715167p5715187.html

So far, the "Divide" procedure evades me.

Here's the situation: Imagine the cross section of a balloon resting on two pins. I want to remove the portion of the circle lying between the two vertical lines.

When I started with a "Snap" on the left-hand intersection of the circle and one vertical line, the circle became unclickable. "Escape" out of that avenue.

What appears to work is to set a "Point" (with "Draw")  at each intersection, then  "Divide" by clicking on the circle outside the unwanted section, then click on the left hand intersection, then (ignoring what the Command line demands) click one more time, but on the right-hand intersection, and presto ! the unwanted section turns light blue. I then "Select" that light blue section and "Delete" it. Gone !

When I try that routine at the other end of the saw kerf, where the enlarged view looks like two, one-dimensional telephone poles standing in a profile of Kansas looking West, the northern side of Kansas disappeared, and I had to recreate it with "Draw Horizontal Line" and then "Trim" the unwanted portion extending towards the North Pole.

This may not be how the developers intended LibreCAD to work, but it's not tedious and it's easy to remember.

Thanks again to dellus for pointing me in the right direction.

Best regards,
georgesbasement