Discussion on "Surface broaching" at the London Section of the Institution

MR. E. J. H. JONES : No one will dispute the credentials of our lecturer this evening to speak on this particular subjeot. Amongother things, he is known as an authority on surface broaching. He has painted an intriguing picture of rows of broaching machines working away whilst production engineers for fifteen months at a stretch, are fast asleep¿also in rows¿ I take it. I might ask him if the production engineer asleep is essential to the satisfactory working of the machine or may we just sit around and read books or go fishing? He has wondered why surface broaching has only recently become recognised as one of the standard methods of production. I think it is because we had available the milling machine which under certain circumstances was a comparatively fast producer of external forms¿whereas the slotting machine, slow and comparatively inaccurate, was responsible for the necessity for internal broaching in order to bring the operation within the limit of commercial economics. We therefore, in my opinion, tackled the more difficult problem first. I do not believe that any one with broaching experience will dispute the contention that it is more difficult to broach internal than external forms.