Machining a deep internal pocket on a DMU50 5 axis running Heidenhain tnc640, using the steep and shallow toolpath. Machine reaches an axis limit and the post adds a rewind move, however this seems to still be done with TCPM enabled so the tool tip gouges right through the part. This doesn't show in simulation as this move is being added at post level.
I am using the generic Heidenhain post to output this as my normal one didn't have the rewind functionality (any advice on that one would also be appreciated!)
Attached is the post.
Here is a snippet of the code:
8402 L X-4.751 Y+25.302 Z+22.938 B+12.92 C+331.125
8403 L X-4.181 Y+25.199 Z+22.733 B+10.723
8404 L X-3.977 Y+25.196 Z+22.654 B+10.605
8405 L X+9.709 Y-41.461 Z-9.06 B+0 C+359.77 <---------------- This is the gouge
8406 ;REWIND: Tool is retracting due to rotary axes limits.
8407 L Z+1.94 F500
8408 L M140 MB MAX
8409 FUNCTION RESET TCPM
8410 L C+211.266 FMAX
8411 FUNCTION TCPM F TCP AXIS POS PATHCTRL AXIS
8412 L X+9.709 Y-41.461 FMAX
8413 L Z+1.94 FMAX
8414 L Z-9.06 F250
8415 L X+3.826 Y+25.372 Z+22.67 B+11.66 FQ50
Any ideas what is going on here? The rewind moves seem very erratic and hit or miss on whether they will safely retract and reposition the tool.
