[simpits-tech] to MARV re: RP

[Marv De Beque]

Lead and pewter are things to avoid.  Not only are they too soft, they are
very toxic materials.

For the home shop, two-part epoxies are probably the way to go.

There are a lot of good quality silicon molding rubbers that can be used to
make a mold from.  That would be my bet.

As for making RP parts, they are simply not strong enough for real world
use.  

Where they shine is for making example parts to check theory or, if high
enough quality, as masters for making rubber molds.  I think the latter
holds some promise.  That is where my money is at.
-- 


> From: "Jim K." <JimK@sisna.com>
> Reply-To: simpits-tech@simpits.org
> Date: Wed, 02 Oct 2002 13:28:09 -0600
> To: Simpits <simpits-tech@simpits.org>
> Subject: [simpits-tech] to MARV re: RP
> 
> Marv,
> The quality of RP prototypes seems to rely on the machine being used and
> what type of RP is being used.  There are several different RP methods and
> they do produce different results.  I think you can change the quality
> outcome of a part via your drawing and/or the settings in the RP machine
> itself and the way you make the part is critical as well.  I.E., you have
> to choose the correct orientation of the part from which to start.  I have
> some RP parts here and the top final surface that was generated is as
> smooth as glass but the sides have that "grain" to it.  I don't think FDM
> parts have this grain to it but I'd have to check.  I just brought this all
> up as an option.
> 
> hmmmmmm, thinking here:  What if you made a mold of the part via a CNC
> machine and then melted lead or some type of plastic into the mold to make
> your own parts???
> 
> Jim
> 
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