I posted a bit about this in a thread called "Off the secret list" a while ago.
Got to play with this a bit more serious today.
Set the big Hoffman dividing head up on the horizontal mill with a mandrel to hold some change gears. These are 27 teeth 14 DP but the old 14.5 degree pressure angle that are nearly impossible to find.
These are actually metric conversion wheels for a Clausing Colchester for a guy in the States.
Shot of the job is at:-
Pics from top left working clockwise are:-
 General shot of the layout.
 Close up after cutting seven teeth and nearly finishing the 8th.
 Shot of the Division master display at this point. Shows the number of divisions programed. Number of completed passes and the current position of 93.330 degrees. The true position should be 93.333 degrees.
At any given point the biggest error was 0.008 degrees.
 Shot of the finished four gears.
This is one neat bit of kit. For a better look at what it can do visit their web site.