How is the weight?
Is it closer to Aluminium or bronze.
Any use suggestions or observations appreciated.

--
~david

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On Sat, 30 Apr 2005 00:00:26 GMT, "David" wrote:

How is the weight?
Is it closer to Aluminium or bronze.
Any use suggestions or observations appreciated.
Greetings David,
Weight much closer to bronze. Harder to machine than 660 bronze, which
is probably what you are thinking of when you say bronze if you are
making bearings. With regular old half hard brass as a comparison with
a machinability rating of 100, aluminum bronze is rated 60, and
aluminum nickel bronze is rated 30. Aluminum bronze is 91.2% copper,
7% aluminum, and 1.8% silicon. Sae 660 bronze is 83% copper, 7% tin,
7% lead, and 3% zinc. Both have higher tensile strength than mild
steel. Both make good bearings if used against steel. A good example
would be valve guides. Both have poor embedability and so require
clean oil for lubrication if used as bearings.
Hope this helps.
Cheers,
ERS

"Eric R Snow" wrote in message
...
On Sat, 30 Apr 2005 00:00:26 GMT, "David" wrote:

How is the weight?
Is it closer to Aluminium or bronze.
Any use suggestions or observations appreciated.
Greetings David,
Weight much closer to bronze. Harder to machine than 660 bronze, which
is probably what you are thinking of when you say bronze if you are
making bearings. With regular old half hard brass as a comparison with
a machinability rating of 100, aluminum bronze is rated 60, and
aluminum nickel bronze is rated 30. Aluminum bronze is 91.2% copper,
7% aluminum, and 1.8% silicon. Sae 660 bronze is 83% copper, 7% tin,
7% lead, and 3% zinc. Both have higher tensile strength than mild
steel. Both make good bearings if used against steel. A good example
would be valve guides. Both have poor embedability and so require
clean oil for lubrication if used as bearings.
Hope this helps.
Cheers,
ERS

Thanks,
Helps allot. I was hoping it was more like aluminium with a bronze colour.
Apparently not.
david

Its hard stuff to get a good finish on without a lot of care


"David" wrote in message
news:lMBce.1169451$6l.737263@pd7tw2no...

"Eric R Snow" wrote in message
...
On Sat, 30 Apr 2005 00:00:26 GMT, "David" wrote:

How is the weight?
Is it closer to Aluminium or bronze.
Any use suggestions or observations appreciated.
Greetings David,
Weight much closer to bronze. Harder to machine than 660 bronze, which
is probably what you are thinking of when you say bronze if you are
making bearings. With regular old half hard brass as a comparison with
a machinability rating of 100, aluminum bronze is rated 60, and
aluminum nickel bronze is rated 30. Aluminum bronze is 91.2% copper,
7% aluminum, and 1.8% silicon. Sae 660 bronze is 83% copper, 7% tin,
7% lead, and 3% zinc. Both have higher tensile strength than mild
steel. Both make good bearings if used against steel. A good example
would be valve guides. Both have poor embedability and so require
clean oil for lubrication if used as bearings.
Hope this helps.
Cheers,
ERS

Thanks,
Helps allot. I was hoping it was more like aluminium with a bronze colour.
Apparently not.
david

David,

The work I have done with Aluminum Bronze is in the casting of CDA 956.
It's about 91% Copper, 7% Aluminum and 2% Silicon. All this was done at a
commercial foundry about 20-25 years ago.

I considered this to be the "best" of the brasses and bronzes that I worked
with in terms of overall strength and use in engineering applications. It's
density is nearly that of any other bronze or iron. In other words there is
insufficient aluminum to "lighten" it. The color is a light gold.

I also considered this the "worst" alloy from the standpoint of difficulty
in casting. It is highly suceptible to shrink defects and easily oxidizes,
forming dross defects. The best preventions are to riser the alloy with the
best possible practice and anticipate a large amount of shrinkage. This
means large risers and large riser necks. The gating should be
non-pressurized, or sprue-choked and use bottom gating and smooth flowing
runners and ingates. Melting should be carefully controlled, drosses
skimmed off before pouring, and the molds should be filled carefully.

If the founding is done well then when the parts are cut off the gating and
risers removed, the metal will clean up well and make excellent looking,
very strong, corrossion resistant castings.

Mark


"David" wrote in message
news:uUzce.1167345$8l.785060@pd7tw1no...
How is the weight?
Is it closer to Aluminium or bronze.
Any use suggestions or observations appreciated.

--
~david

_____________________________________________
«¤»¥«¤»§«¤»¥«¤»§«¤»¥«¤»«¤»¥«¤»§«¤»¥«¤»§«¤»¥«¤»
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯