Hi all,

I've been using bobcad V25 Pro for a couple years on a mill that I retrofitted with a PC based control running Mach 3.

One thing I've not been able to figure out is, in the bobcad generated simulation of a program it "thinks" it's moving at a rapid feedrate (red lines) when the Z axis is above the part but the post will frequently and randomly have these repositioning moves running at G01.

I've tried varying the Rapid and Feedrate planes to no avail.

I'm using this post:

Mach3-Mill-NoATC.MillPst

but have tried the other MACH3 post that came with the program too.

This is a typical Piece of code:


N31 X-3.0709 Y-2.085
N32 G03 X-3.0435 Y-2.2479 I.0676 J-.0724
N33 G01 X-2.8839 Y-2.3188
N34 Z.1
N35 X-2.4593 Y.51
N36 G00 Z-.215
N37 G03 X-2.4593 Y.2107 I.6471 J-.1496 F15.
N38 G02 X-2.429 Y-.0443 I-1.1323 J-.2639
N39 G01 Y-.0495
N40 Y-.9307
N41 G02 X-2.5977 Y-1.178 I-.2657 J0.
N42 G01 Z.1
N43 X-2.7704 Y.51
N44 G00 Z-.215
N45 G03 X-2.7704 Y.2108 I.4697 J-.1496 F15.
N46 G02 X-2.729 Y-.0461 I-.8104 J-.2623
N47 G01 Y-.0495
N48 Y-.8479
N49 X-2.7178 Y-1.1462
N50 Z.1
N51 X-3.095 Y.51
N52 G00 Z-.215
N53 G03 X-3.095 Y.2108 I.2922 J-.1496 F15.
N54 G02 X-3.029 Y-.0478 I-.4865 J-.2619
N55 G01 Y-.0495

Lines 34, 42 and 50 all move to Z.1 but the next "repositioning" move is at G1 when it should be G0. Even more confusing, the G0 Z- moves following. It's like it figured out it should be in rapid 2 lines too late, lol.

I suffer through fixing these manually when I'm making many parts with the same program but when it's only a few then it can be a waste of time to try and fix the program manually as opposed to just letting the machine run.

This is also a somewhat random problem with the G0 moves occurring as they should maybe 10% of the time in a program.

Hopefully this is a post problem.

Any help is appreciated!