[TenTec] Encoder shaft stability

[Phil Chambley Sr.]

Hi Jerry...

Yes, I have one of the old NC-100 gearboxes in the attic, and it would be 
great if there was enough room. :)  They had a great feel.

The extra bushing out front would be ideal.  Do you recall whether the 
encoder shaft will accomodate it and still have length for the knob?  I'll 
have to pull the cover off one of mine and see.

BTW, I used the term "wobble" in my earlier post, and that was a poor choice 
of words.  The knob does also appear to wobble, but that is another issue 
that can be helped by re-positioning the skirt.

Phil C. Sr.
k4dpk





I envision a bar of aluminum with thin ends and a fat spot in the middle
supporting a bearing bushing. That bearing might be oillite, steel
backed teflon, Vespar, or a needle roller bearing assembly. Such as
McMaster-Carr catalog numbers 6391K126, 60695K61, 58315K42, or 5905K21.
These will add some friction along with the shaft support and may
require machining on the knob to give clearance. Any assembly will
interfere with the knob drag mechanism if present. A little added
friction may not hurt, giving the feel of there being some more drive
mechanism behind the knob than just a optically sensed slotted disk,
typical of the encoder is part of the wish to add a weighted knob. More
like the National Dial or gear driven variable capacitor tuners of yore
with a 25 or 50 to 1 gear reduction between the substantial knob and the
variable capacitor. Where the top end radio tuning knobs turned like
parts of precision mechanisms doing real work driving dial and capacitor
(or PTO screw) often at much different rates than the knobs turned.
>
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73, Jerry, K0CQ
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