Not sure if this needs to be in the classifieds or what, but thought someone might be interested. Went to look at a lathe for sale last week. It is an awesome machine, but way to big for me. I was looking to upgrade my current lathe, but this thing would cave my work shop floor in! (if it would even fit) It is a 1936 Monarch 16" W. It is in Fayetteville, NC. I have owners contact info if anyone is interested in following up.
I can imagine it would have no problem at all turning any scale or most full size cannon barrels.
Here at Hern we had 4 Monarch's up and running when we had the machine shop going. 16 - 18" swing x 48 - 96" beds. Turning cast iron - they'll go for forever! couple of them had rebuild tags from Boeing during the war years... Able to sell the small one for $1000. bigger ones got scrapped...
Happy to field Cannon manufacturing questions as well as Genealogy - FamilySearch.org helps!