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Discussion in 'Trumpet Discussion' started by gasp1974, Apr 9, 2009.
I read somewhere that the valves in some trumpets aren't completely round.
Then twisting them would probably not be an option.
they start life round. As we do not push straight down, the wear is uneven and therefore "unround". The wear makes the valve ever smaller and the casing bigger so twisting becomes even LESS of an issue!
Thanks y`all for your inputs
I would expect exactly this out-of-roundness as the instrument wears - what I wouldn't expect would be for an instrument manufacturer to grind a valve off-round - think of the tolerance stack-up - the difficulty of ensuring that the ports are aligned - that the valve went in the casing at exactly right angle. The expense would be prohibitive. Round valves and round cases are rather easier to manufacture than off-round, the process is easily repeatable, and cost efficient.
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Perfect - "That's me, that's me"
Valves -pistons- are honed on the lathe, later by hand.
Don't be scared, unless you twist'em with some violence and inclination.
Funny enough, the rotary valves on my picc do not need to be oiled! They have sealed ball bearings at the top and bottom. The valves thmselves are made of carbon fiber and the casings of red brass, so nothing really sticks to them. All I have to do is keep the horn clean. The manufacturer of the valves is LÃ¤tzsch in Bremen, Germany.
rowuk - as a past machinist and a journeyman machine repairman that is a very interesting set up on your rotary trumpet. That just makes so much sense, how long have they been making rotary valves like that. I can see that it would be expensive to make but the only maint. would be to clean the valve and maybe replace the bearings once in a great while. The seals on sealed bearing never last forever. Now all we need is to let Latzch to design a better piston set up.