I think that Roger is referring to a device known in the UK as an
"epicyclic" drive, or shaft coupler, which consisted of a quarter inch
diameter knob shaft, with a flat reduction mechanism, about one inch in
diameter and a quarter of an in thick, which then had a quarter inch female
shaft socket on the opposite side of the mechanism to couple with the device
being rotated. From memory I think that the ratio was about 10:1. The
graduated scale fitted on the outer of the reduction mechanism.
These devices were very cheap and often formed the drive for many of the old
BC radios, with the addition of the cord and cord drum which moved the dial
pointers. 73, John. G3JVC.
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Roger
Sent: 03 October 2009 01:12
Cc: amps@contesting.com
Subject: [Amps] Vernier knobs?
I've been looking for some vernier knobs for quite a while. They'd be
akin to a turns counter, but without the handle or counter. Appearance
would be a knob with calibrations and a skirt with calibrations that
moves a given travel for each turn. That's about the best I can
describe one and It seems like I saw such an animal on some commercial
test gear, years ago. No, I don't want the little turns counters that go
with 10 turn pots. I just don't like the looks of them.
IOW I could do this with turns counters, but I want to replace the turns
counters with a much sleeker looking arrangement. These will be driving
vacuum caps and a roller inductor.
Any one ever see any of these critters, or know where I can find
some.What I remember is something that looked similar to the knobs and
skirts on my Alpha 76, but the skirts turned much slower than the actual
knob. However what I want turns the shaft at the same speed as the knob
while the skirt keeps track of the revolutions. Or is it just my old
imagination playing tricks telling me that such exist...or used to.
73
Roger (K8RI)
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.409 / Virus Database: 270.14.3/2411 - Release Date: 10/03/09
06:20:00
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|