[Heathkit] What is a Harmonic Drive Part # 467-1?

[Bwana Bob]

The Harmonic Drive was the original vernier tuning drive used on the 
HW-100. It was only used on this radio. It was a very simple mechanism 
with a plastic flexible spline gear that attached to the VFO capacitor 
shaft. The internal teeth on the spline gear meshed with teeth on the 
outer knob housing, which was fixed to the front panel. Cams on the 
tuning knob pushed against the spline causing it and the VFO shaft to 
rotate. It was reliable, but tended to have a lot of backlash unless one 
tinkered with it. When Heath replaced the HW-100 with the HW-101, the 
dial drive was replaced by a more conventional set of series-connected 
planetary ball drive ("Jackson Drives"). Heath published instructions 
for converting an HW-100 to an HW-101. This involved some pretty 
extensive rework.

					73,
					Bob WB2VUF

jeremy-ca wrote:
> Its a knob with a seperately rotating skirt but I'm missing the intended 
> application nor do I understand how it works!?!
> 
> Carl
> KM1H
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF        ** For Assistance: 
> dfischer at usol.com **         $$ See the vintage area on the HCI web site 
> - http://www.w9wze.org $$ Heathkit mailing list
> Heathkit at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/heathkit
> 
>