Rounded corners on squares

[Fielding]

Check the tightness of your lead screw set screws.

Here is some more info for you, with users having similar issues.
http://forum.langmuirsystems.com/t/a-slew-of-issues-mainly-very-bad-circles/1361

Cutting corners

When cutting a part with many corners, I noticed that the more I increase the travel speed, the more Mach3 rounds inside corners (to the point they are no longer corners). In the photo attached, I ran a sharpie in place of the plasma. The red and black outlines (with the sharp corners) were done at 100ipm and 50ipm, the black one (with the rounded inner corners) at 200ipm. Is this normal or did I miss some crucial setting on Mach3? [IMG_1535]