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On 8/8/26 03:01, Carlos E.R. wrote:
> On 2026-08-08 04:48, c186282 wrote:
>> e
>> On 8/7/26 14:01, wmartin wrote:
>>> On 8/7/26 06:10, The Natural Philosopher wrote:
>
>
>>>> A late friend had a similar word for pot metal. [Zinc alloy
>>>> casting]. Can`t remember what it was.
>>>>
>>> Don`t know about that one. I want to know where to buy "scratch",
>>> there are so many things that can be made...
>>
>> In USA, the term "pot metal" has been around for
>> a very long time. Mostly zinc but with who-knows-
>> what also mixed in there. It`s not a consistent
>> recipe.
>>
>> IS good enough for low-stress housings and such
>> however and easy to cast/machine. Better than
>> plastic but not as good as decent aluminum or
>> steel alloy. HAS it`s place IMHO.
>
> I think I have seen motors used in kitchens have very cracked metal
> housings. Probably this pot metal.
Very likely - and I`ve seen such cheap motors before.
The alloy does not seem very resistant to vibration.
It`s soft enough you`d THINK it would be, but its not.
Most aluminum alloys and 300 series stainless are
not super-good with vibrations either - though
better than `pot metal`. I`ve seen `magnesium` tire
rims crack too.
Only steel - esp nearly pure iron - seems to stand
up to vibration, but it`s HEAVY. Some cast iron,
like that previously used for engine blocks, can
be pretty good but will fracture on a sharp impact.
I`ve seen old cracked engine blocks too.
Plastics - they start `crystalizing`/decomposing
the instant they`re made.
So, alas, nothing `perfect`. Not sure about titanium
alloys but they`re way too expensive and hard to work
for most applications. Hey, pure gold doesn`t stress
harden/fracture ! :-)
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