Press fit Lead Pipe Issue

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StevenHolloway
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Press fit Lead Pipe Issue

Post by StevenHolloway » Tue Sep 22, 2020 6:58 am

How can you make a press fit lead pipe fit more securely in the receiver so it can’t move around or fall out if the slide is turned upside down. I have a lead pipe that I use on my Yamaha, but it’s a loose fit and won’t fit tightly and securely how I want it to.
vetsurginc
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Re: Press fit Lead Pipe Issue

Post by vetsurginc » Tue Sep 22, 2020 7:03 am

I use a bit of painters tape around the top (Bach42 lead pipe).
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Doug Elliott
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Re: Press fit Lead Pipe Issue

Post by Doug Elliott » Tue Sep 22, 2020 7:23 am

If it's that loose it's also not fitting tightly in the bore, and it would probably play better if you slightly expand the end. Be careful...
WGWTR180
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Re: Press fit Lead Pipe Issue

Post by WGWTR180 » Wed Sep 23, 2020 6:00 am

I've used paint tape as well. Doug's point is also very valid.
Elow
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Re: Press fit Lead Pipe Issue

Post by Elow » Wed Sep 23, 2020 10:07 am

Uhh, give it to tech. For me, slide expanders are the second most scary thing in a shop. First are buffing wheels. Once you expand, there’s no going back. Real easy to have to replace something.
Edit: ok i take that back, lathes are scary. Point is, it’s really easy to mess something up when you don’t know what you’re doing.
tbonesullivan
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Re: Press fit Lead Pipe Issue

Post by tbonesullivan » Wed Sep 23, 2020 11:25 am

Does it fit snugly inside of the slide tube? There are also some other issues involved. I would also definitely take it to a tech to have the whole thing examined, and see if there is something they do to give you a permanent fix. I know with my screw in leadpipes, they aren't loose even if I don't screw them in.

Are you sure the leadpipe is the right size for the slide?
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Bach 39 Alto & 42T, King 2103 / 3b, Kanstul 1570CR & 1588CR, Yamaha YSL-640, YBL-612 RII, YBL-613HS, & YBB-631S Tuba, B&H Eb Tuba, Sterling 1056GHS Euphonium,
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btone
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Re: Press fit Lead Pipe Issue

Post by btone » Sat Jul 17, 2021 9:52 am

Teflon tape, like plumbers tape. Sticks to itself.
Kbiggs
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Re: Press fit Lead Pipe Issue

Post by Kbiggs » Sat Jul 17, 2021 5:59 pm

There are two places where a leadpipe needs to fit securely: at the receiver, and at the end of the leadpipe. As a temporary fix, plumber’s tape (or something else like it) around the receiver end of the pipe can work. But that’s really only a temporary fix. To fix the real problem, have a tech burnish (NOT expand) the end of the leadpipe to fit snugly inside the inner tube of the slide.
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Matt K
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Re: Press fit Lead Pipe Issue

Post by Matt K » Sun Jul 18, 2021 5:34 am

Have a tech solder a ring to the top and then file it down until it fits snugly. Love thay setup. Just got a slide back from tech that had thay done to it. Prefer it over threads tbh.
baileyman
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Re: Press fit Lead Pipe Issue

Post by baileyman » Sun Jul 18, 2021 7:53 pm

For the flaring of the end in the top tube, sometimes a suitable mandrel will be in any old toolbox. I have a 1/4" drift, for instance, that is gently tapered to the handle that I would use. By pushing it in the end by hand, and rotating it under pressure, the end of the pipe will expand slightly. Check the fit frequently. It's pretty easy to sneak up on an exact fit. It's important to use a gentle taper.
brassmedic
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Re: Press fit Lead Pipe Issue

Post by brassmedic » Mon Jul 19, 2021 12:26 am

The leadpipe doesn't need to have an airtight seal at the receiver end. If it bothers you that it's "wobbling", then wrap some plumber's tape a.k.a. teflon tape around it. The part that needs to have an airtight seal is the other end of the leadpipe, and if it's loose enough that it can fall out by itself then it's probably not airtight. A tool that works just fine for slightly expanding the end of the leadpipe is a mouthpiece shank. However, I would highly recommend having a tech do it, because you can easily mess things up if you don't know what you're doing.
Brad Close Brass Instruments - brassmedic.com
baileyman
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Re: Press fit Lead Pipe Issue

Post by baileyman » Mon Jul 19, 2021 9:00 pm

I always thought a good fit at the end in the top tube would be needed to avoid wave resonating into the cavity between the leadpipe and the top tube. That could make a Helmholtz resonator, acting like a comb filter, a really weird mute. But you know, if it doesn't actually happen, then cool, I'll quit worrying about getting a snug fit.
brassmedic
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Re: Press fit Lead Pipe Issue

Post by brassmedic » Tue Jul 20, 2021 3:12 am

Never heard of that happening, but if that really worries you then by all means get your leadpipe modified. :idk: The problem is, leadpipes were originally designed to fit flush with the receiver and be soldered in. If you pull the pipe and solder a ring onto it, it's actually sticking out past the receiver a bit, and wasn't designed to be a snug fit that way. And different makers have different solutions to how their leadpipes fit and how far the mouthpiece inserts into the leadpipe, so if you're using a leadpipe from a different maker or an aftermarket leadpipe, that's not necessarily designed to be a snug fit at the receiver end either. I like to just wrap some tape around it and be done with it, but you could also shim it. I think trying to open up the receiver end more and changing how far the mouthpiece inserts is pretty risky, though.
Brad Close Brass Instruments - brassmedic.com
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