Charles, sorry I couldn't answer sooner. >From what I've read, 844 wound up with a 2" flat spot on all eight drivers. >It may not seem like much on an 80" driver, but these flat spots will always >be syncronous,(due to the side rods) and the flat spots will all hit the rail >at the same time with each driver rotation, being hard on the track and the >locomotive.
There's no way that men with hand grinders could remove enough metal around the drivers to eliminate the flat spot, let alone ensure a round wheel or proper profile. They can smooth the transition from flat to round somewhat in onder to allow the locomotive to be moved slowly to the nearest facility. Because all drivers move in unison, they have to be the exact same diameter, otherwise extra strain is placed on the rods. 844's drivers must be machined down to the deepest part of the flat spot, about 1/4" I'm told. So the only solution is to drop the drivers in a drop pit and send them out for turning. Two sets were trucked to Strasburg and the other two sets went to TVRM where both shops have a wheel lathe large enough to turn down the driver tires and profile them. Rich G(ajnak) --- In [email protected], Charles Weston <rotary-oy@...> wrote: > > Rich, > > Could you elaborate please? > > Charles W. > > --- On Tue, 5/1/12, richgajnak <rustytraque@...> wrote: > > From: richgajnak <rustytraque@...> > Subject: {S-Scale List} Re: UP's open house! > To: [email protected] > Date: Tuesday, May 1, 2012, 4:48 PM > > > > > > > > > Â > > > > > > > > > > They're not trying to fix the flat spots as such. They're relieving > the the edges of the flat spots so the locomotive can be moved at restricted > speed. > > > > Only a wheel lathe will "fix the flats." > > > > Rich G(ajnak) > > > > --- In [email protected], Charles Weston <rotary-oy@> wrote: > > > > > > Here's video of the crew trying to fix the flat spots in the field: > > > > > > http://railways.national-preservation.com/locomotive-engineering-m-i-c/35739-how-not-rectify-tyre-flats.html > > > > > > Charles Weston > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/S-Scale/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
