[HAM] Tonewheels

[Dave Bishop]

There is a movie circulating around the net showing Hammond tonewheels being 
"hobbed" on a machine that looks something like a lathe.  A stack of 75 or 
so blanks are secured to an arbor, and a cutting tool that looks like a 
screw gear with perpendicular slots cut across the threads travels into the 
stack, both turning at the same RPM in opposite directions--sort of a 
controlled crash with the hob tool cutting the teeth out of the blanks.  I 
used to supervise a gear machining department at a tractor factory, so 
watching the process brings back lots of memories-- particularly the smell 
of cutting oil.

Regards,

Dave Bishop