My cat likes to lap stuff and he needs a job. All he does at our house is sleep! Luke Zyla 2nd horn, WV Symphony Orchestra www.wvsymphony.org
On Feb 3, 2011, at 2:59 PM, Steven Mumford wrote: > > > Interestingly (well at least to geeks like me) the rotors on the old > Elkhart Conns were not lapped, they were just machined to fit correctly. > That's probably why they were so dependable. Over the last 20 years or so, a > lot of horns have had trouble because they never got the lapping compound > completely out at the factory. That would make the valves and the tuning > slides stick. The solution for those horns was not more lapping. They were > already getting lapped more and worn out more every time you played > something. The cure was just to clean them out correctly. > I'm trying to remember a time when I ever had to lap a rotor, other than > when doing a plating and refitting job. I don't think I EVER have in the > last 30+ years on a horn. A couple of times on trombones after the slide > knuckle got the crap bent out of it and badly distorted the casing. Very > rarely (counting on both hands but no toes involved) I've had to refit the > top bearing plate on a new horn when it would fit too tightly and bind the > rotor. > I do a LOT of lapping for valve rebuilding. Boy is that a tedious job! > Apprentices wanted. Must be willing to eat gruel and lap valves 18 hours > each day. > > - Steve Mumford > _______________________________________________ > post: [email protected] > unsubscribe or set options at > https://pegasus.memphis.edu/cgi-bin/mailman/options/horn/lzyla%40suddenlink.net _______________________________________________ post: [email protected] unsubscribe or set options at https://pegasus.memphis.edu/cgi-bin/mailman/options/horn/archive%40jab.org
