Put a plug in it at the chuck otherwise you run the risk of having it buckle a lot and get loose as you machine away material approaching the chuck.
If you are going to be doing many part-offs my procedure is a bit tedious to program and you cna do it incrementally in a loop something like this.
G10 L2 G90 P1 Z0.
M97 P1000
G10 L2 G91 P1 Z(-width) M97 P1000 L100
G10 L2 G90 P1 Z0.
M30
----
N1000
This shifts G54 ahead incrementally. I have to say I have never used this approach simply because it makes me nervous. If you make a mistake on the Z(-width) and L xount you might easily increment your way into the chuck.
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