Posted by tom on November 06, 2011 at 14:58:58:
In Reply to: 2 to 1 ratio posted by mark fenn on November 05, 2011 at 07:16:11:
mod.3 30°helix centre distance 110 mm
z21 outside diameter 78,65 mm
n°4 z measurement for is 32,76 (chordal)
z42 outside diameter 151,70
n°8 z measuremnt for z42 is 69,08 (chordal)
regard tom