August, 2001.
The task of align-boring (sometimes incorrectly called line-boring) the valve cylinder is one part of the larger job of rebuilding the valves.
Machinist Tom Weisner and his assistant Dale Birkholz are setting up the Underwood boring bar on the
fireman's side valve, while Don Wheeler, PRPA President, looks on.
Photo by Terry Thompson
Machinist Tom Weisner setting up the Underwood boring bar on the
fireman's side valve.
Photo by Dale Birkholz
Aligning the bar. Photo by Dale Birkholz
Aligning the bar to the exact center line of the cylinder.
Photo by Dale Birkholz
Cutting tool. Dark area is surface yet to be machined.
Photo by Dale Birkholz
Underwood boring bar in operation. Photo by Dale Birkholz
View through the left valve looking forward.
Dark spots on near seat are witness marks. Photo by Dale Birkholz
Aligning the boring bar with dial indicator. Photo by Terry Thompson
Machinist Tom Weisner (left), assisted by Dale Birkholz, setting up
to bore the valve cylinder on the engineer's side.
Photo by Terry Thompson