profiling rectangular

[grf]

hi everyone
i am trying to profile a rectangular and visual mill is doing something strange.
normally i would expect it to cut 4 straight sections but instead it tries to cut 4 straight sections and then it tries to cut very small arcs where the corners are by cutting small straight sections. i tried to make the drawing in various programs and even i made it in vm with the same result. does anyone have any idea why this is happening?

[scudzuki]

When cutting a square corner the toolpath will be an arc equal to the radius of the tool. This results in a sharp corner on the part. As for the arc being short line segments instead of a circular interpolated move, under machining preferences output arcs (and spiral motions and helix motions) as linear segments should be disabled (unchecked) unless there is some reson your control requires any of those options. To force the MOP to generate G2/G3 moves over line segments, cut arc fitting needs to be enabled in the plane the arcs are generated in (on a VMC this is usually XY) with a tolerance less than the overall tolerance. I set the tolerance (on the cut parameters tab) to .0001" and the cut arc fitting tolerance (on the advanced tab) to .001".

That is what has worked for me.

Joe

[grf]

thanks for that. i tried it and it work. a lot better than what it was before.