That ain't gunna happen - not as long as you have your fundamental orifices.
Agreed.
Did a couple of 14 ft and a couple of 12 ft 2" x 4" x 1/8" square tube parts on the Bridgeport about 3 years back. Around 20 - 25 holes, 1/2" diameter in both.
Tried a number of ways to get a feel for accuracy even though that particular job wasn't precision. Bridgeport has a decent DRO which made life easier.
Registering by leaving the drill in the last hole and moving the table under it gave around 0.050" positional error if I just mashed the drill through in one. Good enough for that job. To my surprise, and delight, cumulative errors pretty much got lost in the wash.
Maybe 0.030" if I did the centre drill, pilot drill and open out thing. Close enough to notice cumulative issues.
Registering with pin in chuck rather than drill was maybe 5 thou + better.
Fixed pin on table got to maybe 10 to 20 thou error range depending on exactly how inspector meticulous I felt like being.
I imagine that using a fixed pin for rough registration and picking up the hole with an indicator could get under the 5 thou error range hole to hole. Cumulative might be all over the shop tho'. But its a drilled hole so accuracy is limited even if you go four facet and use guides. Cleaning up by boring dead to size with tight fitting register pin in bottom and straddle held pin in top with indicator reference might get close to 1 thou error band hole to hole. Cumulative will be worse.
With a really long job like mine support becomes important. The effect of it not sitting naturally flat relative to the table is noticeable.
Shifting the Bridgeport round a bit let me poke my job out through the secondary shop door and over the veggie plot. Fine tuning the machine position so the job didn't get caught up in the runner beans isn't a common machine rigging requirement.
Clive