Stuart Stevenson wrote:
> On a Mazak I ran years ago there was a button I think was TPS (Tool Point
> Save). This allowed you to stop in a cut, push the button, move the machine,
> push the button, move the machine, push the button.
The Allen-Bradley 7320 (1978-vintage control based on 16-bit 
minicomputer) had a "jog retract" button.  it allowed you to retract any 
axis, but ONLY one, in the middle of an interpolated move, and then 
resume from that point in the move.  So, you'd hit cycle stop, jog 
retract, then you could jog that one axis, and then hit cycle start, and 
it would return the tool to the point it left off and continue the 
move.  I don't know if you could enter new tool offsets, but it seems 
like that might be part of the point of such a feature.

It was also incredibly easy to back up to the beginning of that move and 
restart it, which is what I generally used.  You hit cycle stop, maybe 
jogged back from the work, then hit "tape search rev" one time with the 
selector switch in N-word, and it would re-read the current G-code block,
then you hit cycle start and it would re-do the block from the beginning.

Jon

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