On 1/18/2016 10:03 PM, Sven Littkowski wrote:
> Yes, here are machine shops, but Jamaica is a very poor country (thanks
> to its incapable and corrupt, partially even criminal government). The
> machine shops here are very limited in what they can do (type of
> machines they can afford), and also very limited by metal types.
>

You won't get any arguments from me on that assesment. :-(

> Some weeks ago, I tried to find a machine shop that can create a
> fast-rotating disc for a machine I wanted to build to make powder out of
> empty plastic bottles (see attached render image), and they couldn't do
> it. I went to over 20 machine shops until I gave up. I learned, what
> they can do, and what not.
>


That is a different kettle of saltfish. ;-)
Your grinder blade is quite complicated. You would need a template to 
stamp out the body then you would have to weld the uprights. A prototype 
would be hard and expensive to make. On the other hand, the part you 
need for the meat grinder is simple. I don't think that the pressure 
justifies surgical stainless steel. Just a metal that would not corrode. 
I agree with Scott that a piece made from printed plastic might be 
unsuitable for your needs. You would never know what beasties were 
hiding in the crevices or when its structural strength would fail.
I would take the drawing you did for Scott and ask about that.
I have a similar problem with a pressure cooker. The plastic well that 
the relief valve sits in. Sheared off and I have a large pot with a 
whistling lid, now. Even at the low-ish pressure of 15 psi I would not 
contemplate using a printed part unless it was properly engineered.
It is a great idea but  a bit iffy in practice.


-- 

Regards
     Stephen

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