True key to the use of that is 1), insure the mill is leveled with a precision level such as a Starrett, 2) calibrate the the dead-pilot, X and Y level, on a level precision surface such as a granite surface plate, using a precision V-block, and lastly, insure the head of the mill is trammed dead-balls perpindicular to the table.
Once that is all set, and set 1 time only, it is a VERY ACCURATE, VERY REPEATABLE, VERY QUICK, fixture in which VERY PRECISION multi-angle, or full-radius valve seat/seat replacement work is established, and several quick-change locks/modifications allow us to do just that.
Just one of many, many, many, fixtures/jigs I have here to perform our daily tasks.
Being a papered NYS Toolmaker, serving an apprenticeship back in the mid-'70's, working in the aircraft industry after that in several shops accross the USA(and not riding a stool in a tool crib) and then teaching a machine shop course at a local vocational school, the use of that tool, or any of the multiude of of my personal jig or fixturing I have manufactured/developed of the past 30 years in business, is a complete, and total walk in the park.
And always remember.............sharing is caring.........
