In article , wrote:

One stage further - mount a cheap laser pointer solidly on the
target wall and permanently fix a very small mirror on the mill head
with the mirror aimed to return the laser beam to a target on the wall
close to the laser.

This is getting better by the minute. 8-) Mind you, if you don't have
the mill bolted to the floor then you're screwed. If the mill is 'mobile'
then you'd need the target bolted to the back of the ram. Doable, but less
accurate. Probably more than accurate enough for a bridgeport, though.

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Mike Graham | Metalworker, rustic, part-time zealot.
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http://www.metalmangler.com| Caledon, Ontario, Canada