If there is a taper rotor rotating inside a taper casing & going lose, the back screw tights the rotor more in to the casing, thus tighting the valve again. Very simple. Like a taper glass prop in the bottle. Nothing different. As the surface is super smooth & lubrificated (an emulsion of 0,004 mm ca), the tight taper rotor can rotate freely. ...........................................
<[EMAIL PROTECTED]> schrieb: > Hello Hans, > > Is the adjustment you mention below (using the back screw) possible on the > valves of the He-Ga double horn - and without having the valves make > click-clack noise, or have excess bearing 'end-play'? > > On the valves that I am familiar with - Yamaha and King, it seems that the > only purpose of the screw is to fasten the 'swing arm' to the shaft of the > rotor. The position of the moveable 'bearing plate' is used to adjust the > actual rotor bearings. > > Has anyone else used the 'back screw' to adjust the air seal (compression) > of the valves ? > > Jay Kosta > Endwell NY USA > ------ > Prof.Hans Pizka writes: > > > Well, Dave, such a lapping difference of a few thousandths, well , why lapping >different, if the same "loseness" is achieved by just different screwing of the back >screw. The valve body (mainly a cylinder, but taper for 1 or 2 degrees) fits into the >valve like a glass stop into the glass bootle (caraffe). Pushing it less verse the >bottom (by the back screw), leaves the valve looser a bit. But there are myths within >the community of brass players ...... many myths .... most of them used as a cheap >excuse for ones own failure ore difficulties. Brass makers live on these myths. Why >not ? Customer demand is like an order. > > -- > > Prof.Hans Pizka > > email: [EMAIL PROTECTED] tel.: +49 89 903 9548 - www.pizka.de (horn site) with >connections to > > www.pizka.de/Pizka-music.html (publications) - www.pizka.de/PizClasHr.htm >(instruments, mouthpieces) > > www.pizka.de/PizWrHorn.htm (Viennese Horns) - www.pizka.de/mpiece.htm (mouthpieces) > > www.pizka.de/Pizka-travel.htm (pictures, stories, experiences from my travel) - >open soon > > > > mail is virus checked > _______________________________________________ > Horn mailing list > [EMAIL PROTECTED] > http://music.memphis.edu/mailman/listinfo/horn > -- Prof.Hans Pizka email: [EMAIL PROTECTED] tel.: +49 89 903 9548 - www.pizka.de (horn site) with connections to www.pizka.de/Pizka-music.html (publications) - www.pizka.de/PizClasHr.htm (instruments, mouthpieces) www.pizka.de/PizWrHorn.htm (Viennese Horns) - www.pizka.de/mpiece.htm (mouthpieces) www.pizka.de/Pizka-travel.htm (pictures, stories, experiences from my travel) - open soon mail is virus checked _______________________________________________ Horn mailing list [EMAIL PROTECTED] http://music.memphis.edu/mailman/listinfo/horn
