Flange facing on a heat exchanger bundle with an FF6000

Max diameter 54 5/8 inches.
Requested surface finish 125 RMS – no problem with the FF6000.
Had to be done with the FF6000 because the FF6300 was (then) not available.
Anchoring bolts and base plate were designed and manufactured locally.
The machining job did take a couple of hours and was made within the requested tolerances (flatness and rugosity).