I believe this bug has been fixed.  Please upgrade to the latest 2.7 release.

On December 22, 2016 2:01:04 PM EST, Jim Craig <jimcraig5...@windstream.net> 
wrote:
>I was running a program last night on my milling machine. I was cutting
>
>air at the time and saw something that I did not like. I hit the stop 
>button in gmoccapy and the program stopped but then the tool plunged 
>downward in the z direction. I found this very odd. I took a look at
>the 
>tool offset and it was saying 0.000 in. Once again very odd. I played 
>around with it for a little bit and found that when I hit stop then the
>
>tool length offset would be removed. Then this caused the machine to 
>plunge for some reason.
>
>Luckily it did no damage since I was far enough above the part to not 
>cause a crash.
>
>I have tried to reproduce this same behavior in a sim configuration in 
>2.7.8 but I cannot 100%. If you change the G49 G43 option the tool will
>
>show as moving on the screen but it is moving instantly as the change
>is 
>being made. No real plunge occurring, or is it? Was this a glitch in 
>2.7.4? If not what could cause this behavior?
>
>Thanks,
>
>Jim
>
>
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