I needed to cut a 2 1/2" long keyway in a couple of 5/8 diameter shafts and I didn't have an end mill small enough for the task.
So what I did was to lay a piece of HSS that I have ground for cutting groves on its side in the tool post and used the carriage wheel to cause the action of a scraper going back and forth.
If projects like these are going to be on going I see a whole host of new tools I am going to have to make soon
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