"john morris" wrote in message
...
I know it's not wise to connect different metals such as copper tubing to
galvinazed steel pipe because of a chemical reaction between the metals,
but
does that hold true for metals like aluminum and brass? Aluminum and
copper?
I am a novice and tend to build my projects out of scrap stock and things
I
can salvage, so I end up mixing a lot of different metals. Any help
appreaciated.
John Morris.

That would depend on the environment and the application. Will moisture be
present? Galvanic corrosion will happen with practically any metal pair,
and you can't avoid mix-n-match in many applications. (Steel studs in an
alloy head, fr'instance.)
Will you need to take the pieces apart some time in the future?
Is appearance critical?
(too many questions....)

What sort of thing are you making?

--
Jeff R.

"john morris" wrote in message
...
Im making a pnumatic cylinder that will work a christmas display, the push
rod is just drill rod, and the ends are aluminum. I have a piece of hard
copper tubing that works for the cylinder. I expect wear and I am just
hoping to get one season out of it, but just wondered if there will be
other
things to worry about other than wear. Keep in mind, this is a hobby for
me
and with each project I learn a little more. ( even in failure)

So.. that'll be HSS against copper, yes?
A little oil in the bore?
In motion most of the time?
Only for one season?

Go for it.
No galvanic problems there.

--
Jeff R.

john morris wrote:

... with each project I learn a little more. ( even in failure)

*Especially* with failure. Bob

On Sun, 08 Jan 2006 22:10:00 -0500, Bob Engelhardt
wrote:

john morris wrote:

... with each project I learn a little more. ( even in failure)

*Especially* with failure. Bob

Failure? What's that? Perhaps a loud ringing noise (KABLAM) that
is the last thing you ever hear ... and that isn't a failure if it was
intended.

We all sometimes spend more time and money than anticipated in the
"technical approach research and evaluation" phase(s)......
occasionally followed by a "priority review and judicious redirection"
phase.

I know it's not wise to connect different metals such as copper tubing to
galvinazed steel pipe because of a chemical reaction between the metals, but
does that hold true for metals like aluminum and brass? Aluminum and copper?
I am a novice and tend to build my projects out of scrap stock and things I
can salvage, so I end up mixing a lot of different metals. Any help
appreaciated.
John Morris.

Im making a pnumatic cylinder that will work a christmas display, the push
rod is just drill rod, and the ends are aluminum. I have a piece of hard
copper tubing that works for the cylinder. I expect wear and I am just
hoping to get one season out of it, but just wondered if there will be other
things to worry about other than wear. Keep in mind, this is a hobby for me
and with each project I learn a little more. ( even in failure)
"Jeff R" wrote in message
u...

"john morris" wrote in message
...
I know it's not wise to connect different metals such as copper tubing to
galvinazed steel pipe because of a chemical reaction between the metals,
but
does that hold true for metals like aluminum and brass? Aluminum and
copper?
I am a novice and tend to build my projects out of scrap stock and things
I
can salvage, so I end up mixing a lot of different metals. Any help
appreaciated.
John Morris.

That would depend on the environment and the application. Will moisture
be
present? Galvanic corrosion will happen with practically any metal pair,
and you can't avoid mix-n-match in many applications. (Steel studs in an
alloy head, fr'instance.)
Will you need to take the pieces apart some time in the future?
Is appearance critical?
(too many questions....)

What sort of thing are you making?

--
Jeff R.