Most poduction knives are serrated with a serrator.
It is a machine with a big revolving stone. The face of the stone is dressed with a diamond dressor to shape the stone to the desired serrations. The knife is then touched to the revolving stone.
It's just that simple. Serrations are actually put on knives--After the knife is finished. The serrator put in the serrations and sharpens them at the same time.
I have seen fully Automated CNC serrators in action and I have seen manual ones too. I actually had one years ago that was manual. The stone turned and you just held the knife to it and wham--it was serrated.
You can also put in serrations with a die grinder or even a stack of cut-off wheels on a dremel tool.
ME??--never use them--not even on a Bread Knife.--Nothin' beats just plain razor sharp.
Mike..................

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