I posted a few scans of information for the L-W chuck Co. index heads. Also
there is information for spiral milling leads with an index head. I don't
see why this information wouldn't work for any brand of index head with 40
to 1 gear ratio.

http://metalworking.com/DropBox/indexlw.txt

http://metalworking.com/DropBox/indexlw.txt

http://metalworking.com/DropBox/indexlw2.jpg

http://metalworking.com/DropBox/indlead1.jpg

http://metalworking.com/DropBox/indlead2.jpg

I hope this helps a lot of people.

Richard W.