On Mar 2, 7:54*pm, "RogerN" wrote:
Anyone make their own line boring bar/equipment? *It doesn't look that hard
to make and could be handy on jobs that are too big for machine tools. *Just
wondering if there are any good plans or project info on these. *The stuff
looks pretty expensive to buy new for what it is.

RogerN

A lot of that type of thing is specific to the job at hand, locomotive
steam cylinders, VW engine cases, compressor shells, car engines,
etc. One of Guy Lautard's Bedside Readers had a description of such a
rig and some of Colvin and Stanley's works described what they built
up in locomotive shops to redo cylinders in situ. The Model Engineer
magazine had a lot of such setups on the old Brit lathes, they had T-
slots on the carriages so were easy to rig up. The cutter bar spun
between centers and the work was fastened on the carriage and
traversed with same. What you need to build is pretty much determined
by what you need to machine. A lot of what they used to do with such
rigs on a lathe is now done with boring heads on a mill. Basically
all you need is a tool holder, a way to guide it through the rough
bore, a method of spinning it and another one to periodically move it
down the line. You'll also need some way of fastening the works so it
doesn't move relative to the workpiece. The last could be easy or
could be hard, depending on what you want to work on. A star wheel
advance for the cutter is pretty easy to rig.

Stan