Posted by Bill S on October 20, 2004 at 16:25:53:
In Reply to: Help with old standard posted by George on October 20, 2004 at 10:30:57:
Perhaps they meant straigt instead of helical, Straight and spur are sometimes used to mean the same thing.
A rack (gear with infinite diameter) will use straight sided teeth, but I agree with you - straight-sided doesn't sound right for small planet gears.