When I worked for Yale as a machine tool fitter nearly forty years ago
they were turned on B&S autos,washed then tipped into a vibratory bowl
feeder which fed them to a rotary transfer machine which drilled the
countersink on the face then the holes in the side for the pins.From
there they were fed to a broaching machine which put the keyway in.The
broach was horizontal and stationary and the cylinders were carried
past it in fixtures on an endless chain.Can`t remember how many night
latches we made a day but it was thousands.Every one stamped Made in
England when in reality they were made at Livingston in Scotland.
The broaching m/c had been built by Yale at Willenhall and was a POS
from which either me or my oppo was never away from until I rebuilt
Tonight Magnus,my specialist subject is the manufacture and assembly
of Yale night latches,door furniture and door closers.
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