rounding out underneath inside of spitvalve hole

MartyNeilan · Post by **MartyNeilan** » Mon Feb 21, 2011 11:52 am

While in the next phase of disassembly and mods on BART, I discovered that when the hole for the spitvalve was drilled / punched 90 years ago, there is a significant amount of metal that is bent down into the tubing on the inside. I can run my finger through, and it feels like at least 1/16" protruding downward. This is probably causing at least some airflow disruption. What would be the easiest way to smooth this out? The hole is near a bend in the tubing, so I can't easily get at it with a round file.

Daniel C. Oberloh · Post by **Daniel C. Oberloh** » Mon Feb 21, 2011 1:05 pm

A "ball-head" deburring bit (Dremel makes one as well) will do the trick. You go through the vent and use the back side of the bit to clean up the inside edge. simple.

Daniel C. Oberloh
Oberloh Woodwind and Brass Works
http://www.oberloh.com" target="_blank

UDELBR · Post by **UDELBR** » Mon Feb 21, 2011 1:28 pm

I was astounded to see this on my high-ticket Hirsbrunner's main slide.

UDELBR · Post by **UDELBR** » Mon Feb 21, 2011 3:25 pm

goodgigs wrote:OK Joe,Inquiring minds want to know; what's the story behind that photograph ?

My new desktop wallpaper.

Rick Oakes · Post by **Rick Oakes** » Mon Feb 21, 2011 4:07 pm

A guess...While in a "dent bag" it was at the bottom of a pile of stuff.

Rick F · Post by **Rick F** » Mon Feb 21, 2011 4:20 pm

I know what key it's in... it's Be Flat... it really be flat

UDELBR · Post by **UDELBR** » Mon Feb 21, 2011 4:24 pm

Fixable . . . right?

MartyNeilan · Post by **MartyNeilan** » Mon Feb 21, 2011 4:46 pm

bloke wrote:
UncleBeer wrote:Fixable . . . right?
no brag, but (honestly) I'd give it a shot, if someone offered it to me for $0 - $200.

The piston valveset and rotor seem like they were largely untouched. Maybe with a new bell and leadpipe, and a lot of dent work and annealing on the outer bows, plus one or two small tubing replacements, it might not be too bad.

TubeNet

rounding out underneath inside of spitvalve hole

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