Problem with Simulation showing inaccurately extended arc cuts WEDM

[Scott Lent]

I'm using 2020 (recently upgraded from 2019) to program a WEDM and my tool path is chained from lines and arcs I've created specifically for chaining. Nothing complicated, it is an open chain and there are only 5 or 6 entities. Done this 100 times before with no issue.

The  tool path rendered appears to produce the cut correctly, but when I run it it simulation, the cut shows the arcs extend beyond the intersecting of the next entity, and there is no stock cut in a portion of the tool path. While I'm reasonably certain the program would produce the part as intended, I'm baffled as to why the simulation is telling such a different story.

Anybody else run into this?

 

Thanks

[kugel619kc130]

I'm running 2018, and yes, all the time. I find MC Wire to work great...when it works. Very simple contour tool paths end up all over the place. Many times, I will have to select another machine as a new group and can create identical copies of an operation and get 2 very different results in Backplot and Simulation. I have found no rhyme or reason for any of it.

This was supposed to be an open contour along the face of a mold insert tipped on end....2d. Back plot goes wild  like this all the time.