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Discussion in 'Trumpet Discussion' started by coolerdave, Apr 18, 2011.
YouTube - MAGIC VALVE TRUMPET CLEANING STEP 5
How can that process POSSIBLY be good? The speed, for a start, means that there is NO control of the process, nor control of temperature build-up due to friction - the piston will expand at a different rate to the casing (different materials) and the clearance will change - meaning the 'depth of cut' will change.
Also of concern to me is that there is no apparent attempt to find the cause of the restriction, and WHY would anyone think of putting the valve in both ends of the casing . Typically a piston will wear the cylinder (valve casing) more at the top than the bottom due to side loads - I can't imagine any long term good can come of this.
kind of makes me mad ... some poor kid somewhere is going to screw up his horn.
Did you notice the line "see all that black gunk" .. gunk? it's all metel filings!!!
I've used it on a couple of horns. The stuff works great!
Looks just like cutting compound/valve seat lapping paste for cars to me. All you're doing is 'lapping' the valves in, but in a non-specific process that if used improperly could completely wreck the casing/valve as TedH describes.
The whole 'put the valve in upside down' technique, I must admit I have used before. But only with a valve which was stuck. I needed to lap the valve in an extreme situation where some metal grit had worked it's way into a casing and ground itself into the valve. It did work, but it's not something I would like to repeat in a hurry.
This is not something I would use or condone on a 'normal' valve, i.e. one that had no issues and I would always consult a proper tech first of all.
"put it in, and turn".....Oh God!!!!
No thank you.
Look at difficult time he has putting the pistons back in, from the top and bottom.
And least least 50 - 60 times, what happenes if you lose count and get only, say, 47 times. Or even 63 times?
Oh the humanity!
+1-- I get the quote, but perhaps in this case "inhumanity" is a better term!
Stupid is as stupid does!
That guy is not a trumpet player (or technician), he's a PLUMBER.