Discussion on "Surface broaching" at the Eastern Counties Section of the Institution

MR. RACKHAM : I am afraid this is a subject I and many others know very little about, but it has been most interesting. In listening closely I could not quite see the form of broach used in splitting the gap through the big end of the connecting rod. In broaching very thin metal, say £ in. thick would the lecturer make any special form of broach ? MR. WBATHERLEY : I am afraid the slide showing the splitting operation was not very clear. However, the broaching tools for this operation comprised two case hardened mild steel broach bars of flat section, one on the left hand side of the fixture and one on the right-hand side, each having two sets of high-speed steel inserts. The broaching tool on the left-hand side splits the cap half way through, and that on the right-hand side completes the splitting. The inserts being of thin section, dual provision