Greg, Wonderful of you to share this, thanks so much. Steve
> From: gbogantz1 at charter.net> To: phono-l at oldcrank.org> Date: Wed, 10 > Sep 2008 15:47:37 -0400> Subject: Re: [Phono-L] Columbia BC friction wheel > drive> > I just received this link to a forum thread devoted to the Columbia > BC. > Reid Welch has fitted new friction parts to a BC and has had good > success > with them. He even includes a video of his machine in operation! > The only > one on the internet, I think. There's hope for us BC owners yet! > Good > stuff. Enjoy:> > > http://www.forum.condorcup.com/viewtopic.php?f=7&t=20&p=59#p51> > Greg > Bogantz> > > > > ----- Original Message ----- > From: <Zonophone2006 at > aol.com>> To: <phono-l at oldcrank.org>> Sent: Sunday, August 31, 2008 5:16 > 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> > > _______________________________________________> > Phono-L mailing list> > > http://phono-l.oldcrank.org> >> >> >> >> >> > **************It's only a deal > if it's where you want to go. Find your > > travel> > deal here.> > > (http://information.travel.aol.com/deals?ncid=aoltrv00050000000047)> > > _______________________________________________> > Phono-L mailing list> > > http://phono-l.oldcrank.org > > > _______________________________________________> Phono-L mailing list> > http://phono-l.oldcrank.org
