Almost every machine I have worked on had a bypassed Door Interlock. The only ones that still had it were HAAS.
The HFO here sets the machine to Feed Hold when the Door is opened while the spindle stays on. You would then have to hit the Cycle Start to resume the program after the door was closed.
Toby D.
"Imagination and Memory are but one thing, but for divers considerations have divers names"
Schwarzwald
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
www.refractotech.com