On Jun 30, 12:50*pm, "Paul K. Dickman"
wrote:
"George Herold" wrote in message

snip previuos stuff

George H.

Since gluing is a possibility then there are a lot of other options. First,
a press fit plug would probably be the best.

Hi Paul, I need a good 'acoustic' joint between the two materials. I
can see a press fit giving good contact around the perimeter, but I
don't know about the two faces. What (I think*) I want is to get rid
of all the air gaps at the boundary. I've been using this ultra sonic
'goop' between the layers, the quality of the coupling depends on
squezzing hard and having the absolute minimum of 'goop'.

If you want to solder, I wouldn't dick around with the zinc stuff. Get some
La-Co Aluminum flux. This is for lead/tin solders. Scrape the aluminum clean
and apply the flux (I usually scrape some more under cover of the flux) then
tin the aluminum with regular plumbers solder. Tin the brass with whatever
flux you prefer. Then clean both parts, apply regular flux and sweat them
together. Practice with the La-Co on some scrap until you get your technique
down.

OK, that looks like an option. I'll order some. (I already committed
to dicking around with the zinc stuff... can't just let it go to
waste.)


If you want to glue, epoxy is a pain to bond with AL. The best stuff is an 2
part acrylic from Lord #406/16.
This is the stuff they glue airplanes together with. You need a special
dispenser gun and the first use is pretty spendy, but if you ever get a
chance to try it you will be amazed at how well it works.

Hmm, did you mean Lord 406/19. There's a lot of that on the web.

Here I was thinking that gluing would be the easy alternative, but the
advice I'm recieveing seems to suggest that it may be harder than I
thought.

Thanks for the wisdom.. at the moment I'll keep the Lord stuff as a
back up plan,
(If all the more commone epoxies we have laying around fail.)

George H.

*I've just started with this acoustic 'gizmo' so....


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