I have been doing a lot of thinking about cutting gears this way. It's not new there were some attachments out there at the turn of the 20th century to do these on a shaper. The whole operation was also resurrected in the 50's in an article in Model Engineer. I have mentioned this before. Recently I came across some old Victorian gear cutting books [ Have I mentioned I collect books ] In one of these there was a crude method to also generate bevel gears from a rack.
This got me thinking and doing some limited maths and it looks as if this can also be adapted to a shaper using a single point tool. The real proof will be in actually cutting a pair and blueing them up for fit. With this in mind I had a quick look around and bought this today
John S.
-- Regards,
John Stevenson Nottingham, England.