I have two Columbia "Twentieth Century" BC Graphophones, one which plays
fairly well, but not optimally I understand & the other which hardly plays
at all, the problems lying with the reproducers. If anyone can supply
the amber wheel & hard rubber shoe to restore these reproducers to original
performance please let me know & I will have the local antique phonograph
repairer order & install them or
if necessary I can send the reproducers away for repair if I am instructed
how to remove them from the machine - I'd hate to have to ship the whole
machines..
Thanks.
Jim Cartwright
Immortal Pewrformances
jimcip at earthlink.net
EarthLink Revolves Around You.
> [Original Message]
> From: <Zonophone2006 at aol.com>
> To: <phono-l at oldcrank.org>
> Date: 31-Aug-2008 4:16:41 AM
> Subject: Re: [Phono-L] Columbia BC friction wheel drive
>
> paul baker used to restore these but he takes a long time to do it
>
>
> In a message dated 8/30/2008 3:49:30 P.M. Eastern Daylight Time,
> steve_noreen at msn.com writes:
>
> Hi Greg,
>
> Does anyone make reproduction parts for these reproducers?
>
> Steve
>
>
>
> : [Phono-L] Columbia BC friction wheel drive> > Ron, it's difficult to
> explain the BC friction wheel driveshaft system > without pictures or
handwaving
> :o) The drive train begins with a > gear-driven piece of metal tubing
which is
> enclosed in the stationary outer > housing which is fastened to the gear
> housing casting on the side of the > machine. This first piece of tubing
(call
> it part 1) rotates but does not > translate axially. Inside this
rotating
> tubing is the brass coupling sleeve > (part 2) which can rotate and also
slide
> along its axis. And inside the > brass sleeve is the solid rod (part 3)
which
> connects with the amber wheel. > This part 3 rotates and also slides
axially.
> Part 2 has two slots, > diametrically opposed and milled into its
outside
> surface that run almost > the full length of the part. Part 1 transmits
its
> torque via two setscrews > which extend inward from Part 1 into the
slots milled
> in part 2. (Access to > these screws is via a hole drilled in the s
> tationary outer tube.) This > allows Part 2 to be rotated by part 1 and
also
> to slide axially inside part > 1. Part 3 has a "T" shaped fixture at its
end
> that engages two longitudinal > slots milled INSIDE of part 2. This is
what
> transmits the torque from part > 2 to part 3 and also allows part 3 to
> translate axially. The slots inside > of part 2 do not extend all the
way to the
> ends of part 2. When part 3 is > pulled along the mandrel with the
reproducer,
> its T fixture hits the ends > of the slots inside of part 2 and thereby
drags
> part 2 along with it > axially. All this assemblage has a purposefully
> sloppy fit to allow the > amber wheel end of part 3 to wobble around
radially so
> it can follow the > stylus assembly as it is raised and lowered from the
> record surface.> > Clear as mud? Again, it's hard to envision what's
happening
> without > seeing the structure in detail. But maybe this helps
understand it.> >
> Greg Bogantz
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