On Mon, 22 Jun 2009 11:27:56 -0400, you wrote:

>How would the tool know where the safe location is or how to get to the 
>safe location?

It wouldn't, and why should it.

>If I'm thread milling on a mill, I can't just pull straight up? If I'm 
>face grooving on a lathe I have to move in one direction, while if I'm 
>cutting off, I have to move in another.

Commercial controls won't feedhold on thread milling.

BUT - Feed hold does just that, it stops movement. Nothing more.

It doesn't withdraw, go to home, stop the spindle, make coffee or
anything else.

Up to the operator where he feed holds and more importantly where he
positions the tool for the restart.

Some controls complete the current line, some stop mid move,  modern
controls then allow the operator to step out of the program and do
whatever.

Steve Blackmore
--

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