Video Parts (2)
This clip is Part 1 of a 2-part film.
Making a Broach Part 1
Description
The original catalog description provided by the Ford Motor Company reads as follows: “Stock...from which a broach is made.” “Turn high speed steel to tool steel diameter for weld, “5” tool steel “Puller” welded to add tensile strength.” “Weld.” “Placed in small furnace to heat larger portion than weld. This is done to allow broach to be brought up to annealing heat in large furnace.” “Annealing the metal in a large furnace.” “Anvil test to determine faulty weld. The ‘shock test’ is the most severe test to which a broach can be put.” “After being cut off and centered the broach is made straight in this press.” “Special attachment for spacing and cutting broach teeth.” “Milling splines on gear hobber.” “‘Puller’ slots being cut on spline milling machine.” “The chip breaker notches are next milled.” “Hardening.” “Air cooling -- this is done to harden the metal after which it is drawn.” “Rockwell test.” “Lapping and straightening to .008.” “This is a rough grinding job on O.D. to .010” oversize.” “Facing the teeth.” “Grinding the guide bearings.” “Spacing is done with hex block and taper parallel.” “Finish grinding outside diameter and sides of spline.” “Inspection is carefully made.” “Finished broach.” “Broach in use.” [1925]
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