Hey Dusty, put this on that Big 300 Merc

[jackie schmidt]

Jackie, you were reading my mind. When you said portable boring bar I was trying to picture that and how it is powered. I was thinking air only because we had a couple of portable machines that were used aboard ship and they were air powered. If the ship yard had a portable boring bar somewhere I never saw it.
Anyway, I enjoyed the video and I am not done watching it. The setup took more than a little thought.
How was music wire used to establish proof marks?
You mentioned LeBlond in a previous post. The yard bought one to replace one of the old Axel lathes. Some of the levers were replaced by one or two dials on the head stock. You could hear it change gears.
I been away from the trade for 45 years but have never lost interest

When using a music wire to established the shaft line in a vessel, you first stretch the wire, which is anchored inside, through the stern tube and strut and straight with the vessels foundation line and bring it over a hanger with a 1 1/2 inch radius as the break over with approx 90 pounds of weight when using a .032 diameter wire. You then use a set of calipers that have a pointed end on one leg, and establish small punch marks by caliper in to the wire. All of the marks must be exactly the same distance off the wire. You then use these marks to caliper in the boring bare. Basically, you are putting the bar exactly where the wire was.

 

[dmort]

Thanks Jackie, Never to late to learn something,