Posted by georgesbasement on Aug 08, 2017; 2:29pm
URL: https://forum.librecad.org/Trimming-unwanted-arcs-from-a-circle-tp5715167p5715179.html

Two problems have surfaced after chopping off the unwanted stuff:

1.  Here's a circle cut with a narrow horizontal  kerf (i.e., a saw cut) from the outside of the piece, leaving a short unwanted arc of the circle as well as a short unwanted piece of the bounding line. "Trim" cuts away the short unwanted arc from the circle, but also cuts away the bottom of the circle as well. "Trim Two" lets me select one of the bounding lines, but not the other one, necessarily parallel to the first. The only workaround I can imagine is to remove the circle and replace it with two semi-circles, so applying "Trim" can't obliterate the bottom half in Step 1 and the top half in Step 2. That leaves the  unwanted line segment at the other end of the kerf. The bounding lines of the object were created with the "Draw Rectangle" command, and the same problem surfaces there - The bottom half of the rectangle disappears, leaving nothing on which to click during the second step. "Trim Two" again ignores the selection of the second bounding entry.

2. Part of the problem is that after apparently successfully trimming unwanted line and arc segments from my nearly completed drawing, there are several gaps between arc segments and the ends of the bounding parallel lines (at the ends of a slot with semi-circular ends) and also between fillet arcs and the boundaries of the slotted portion of the object. I've tried "Snap at Intersection" but that hasn't gotten me anywhere.