How is the keyway of a Yale lock created?

Couldn't find anything on Google, so does anybody know how the keyway in the cylinder of a typical Yale-type lock is made?

lemel_man wrote:
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I'd always assumed that it would be broached and possibly made in long lengths as the profile runs right through.
Bob

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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 it. Tonight Magnus,my specialist subject is the manufacture and assembly of Yale night latches,door furniture and door closers. Mark.

snipped-for-privacy@ems-fife.co.uk wrote:
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Anything like this?

http://www.youtube.com/watch?v=a-iI-zJ1Mv8

Presumably, it must have taken some toolmaker a hell of a long time to make the broach?

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Similar,but that machine appears to have been built by professional engineers and not a bunch of Willenhall blacksmiths. :-) Mark.

Thanks guys, I reckon I understand it now.

lemel_man wrote:
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http://www.youtube.com/watch?v=FSlOeHTvH4E