Actually an 80" dia. would be simple for one person. Just lay it on the work piece. Anything that large would probably require a Bullard Vertical Lathe or something similar to turn it.
I have some 40" Verniers that see occasional use, and have had 60" and 80". The 60" were Fowler digitals, I must confess. Sometimes it's just necessary to measure that large, and larger. Usually, though not always the case, the tolerance is not so tight that calipers won't do the job adequately. Since I don't turn anything that large, mine see use in verifying lengths, chiefly.
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