SB-series friction dial drive

[rayfri]

Leafing through an old QST a while back I came across a nice little fix
for the SB drives if they start slipping.  The author said he took a small
rubber band and wound it a couple times around the area between the two
discs to increase the diameter in there.  That increased the friction on the

dial and it worked great.  Probably wore on the rubber band, but with such
a simple fix, if you had to do that even every year, it would be no problem.

ray  wa7itz

Ed Richards wrote:

> Hi Murray;
>
> I make my own from parts commonly available from your local hardware
> store. Materials needed are: (A) 2 ea 3/8" sheet metal lock nuts. These
> are beveled around the outside. (B) 1 ea 1/4" ID by 3/8 " OD rubber
> grommet, and (C) a length of 1/4" shaft. I use the excess shaft cut off
> of Radio Shack volume controls.
>
> Place the two lock nuts together with the beveled sides facing out. This
> forms a "V" around the outside to engage the ring on the dial. Force the
> grommet into the hole in the center, and one end of the shaft into the
> grommet. I have made several and they work good. Of course, the rubber
> wont last forever, but neither did the original !
>
> 73,
>
> Ed Richards
> On Wed, 2 Jan 2002 11:11:38 -0500 Multi-Volti Devices
> <multi-volti at SOFTHOUSE.COM> writes:
> > Hello and Happy New Year:
> >
> > Some time ago I requested help in the form of measurements for the
> > SB-
> > series dial drive planetary pressure discs (what else do you call
> > them?). I'll guess they're made of beryllium copper and they
> > eventually
> > crack.
> >
> > I am trying to source them, and either measurements, or ideally a
> > dud
> > pair you've given up hope on I could submit for analysis would be
> > even
> > better.
> >
> > I do not have any SB-gear myself.
> >
> > Murray
> >
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