Morris Dovey wrote:
J. Clarke wrote:

With finger joints it's at least as much about the bit as the jig. A
dovetail you can adjust by changing the depth. With a finger joint
bit and a jig either the bit's the right diameter or it isn't. It
might be possible to design a jig that allows the spacing to be
altered easily by 1/100s of an inch but I've never seen one.

Might actually be interesting to design.

http://woodgears.ca/box_joint/motor_jig.html (sample joint at botom
of page)

http://www.iedu.com/DeSoto/Projects/JBot/ (also does dovetails and M&T
and ...)

Your creativity never ceases to amaze me.