J. Nielsen wrote in
:

How would you have done it?

For those interested in the challenge, I'll post the solution on
Monday. (not like that spoil sport & teaser, Anthony) G

Nice one Jan.

I am sittin here thinkin how I would do it manually for Pete's sake seein
as I dont have any fancy grinders.

CNC some trodes for each half of the helix and EDM it one half at a time,
then polish it.

Then my mind wandered to using a thin wheel and the shaft to grind it, but
no go there.

I'm up to something simular now but using a cam based off the helical data.
Geesh. I'm wide awake now! Thanks!

I think I'm gonna wait till Monday.

ciao
Bing