Hi Hans, Cylindrical casings such as those found on Finke and Engelbert Schmid horns are open on both ends so when they are worn the casings can be honed just like a trumpet valve. The rotor can be then replaced with an oversized one with minimal fitting. In fact, provided the valves are kept oiled, you can expect any rotary valve that is properly fit to last for ten-to-fifteen years with minimal attention. Conversely, if routine maintenance is neglected the best valves can be expected to wear prematurely and have all the usual sticking, clicking problems too. Horn playing is tough enough without having to contend with a dirty instrument with mechanical problems.
Regards, Bob > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of Prof.Hans Pizka > Sent: Tuesday, January 10, 2006 5:34 PM > To: 'The Horn List' > Subject: RE: [Hornlist] Re: signs of leaky valves > > How to adjust cylindrical rotors (otherwise they could not > fall through an open casing) for air-tightness ??? After they > show signs of wear ??? > ============================================================ > =================================================== > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of [EMAIL PROTECTED] > Sent: Tuesday, January 10, 2006 11:11 PM > To: horn@music.memphis.edu > Subject: [Hornlist] Re: signs of leaky valves > > > I'm not aware of any makers nowadays who use no taper on > the rotors. > > There are some who have cylindrical rotors with tapered > rotor bearings, though. > > I asked Johannes Finke (of Finke horns) about this after > reading (on the Finke website) how they make their valves. > Herr Finke told me that their rotors would drop straight > through an open casing. > > So, there's no taper on the rotors, but I'm not sure whether > Finke bearings (or "axles") are tapered. I do know the thrust > in a Finke valve is kept in check with a single ball bearing > on top, adjusted by a setscrew... which is an extraordinarily > cool idea if one intends to keep a horn for a long while. > > Also, this is not said by way of any DiSAGREEMENT with what > you've stated. It's simply more information towards further > discussion on the same point. > > GPF > _______________________________________________ > post: horn@music.memphis.edu > unsubscribe or set options at > http://music2.memphis.edu/mailman/options/horn/hans%40pizka. > de > > _______________________________________________ > post: horn@music.memphis.edu > unsubscribe or set options at > http://music2.memphis.edu/mailman/options/horn/rosmun%40osmun.com > > _______________________________________________ post: horn@music.memphis.edu unsubscribe or set options at http://music2.memphis.edu/mailman/options/horn/archive%40jab.org
