[SEL] 8hp Blackstone/cast engine plate

[Elden DuRand]

Jerry:

There's also what's called "Investment" or "Lost Wax" casting.  This is used for artwork, gold teeth and things like turbine blades.

Basically how it works is you make a mould of your part out of RTV rubber, plaster paris, etc, then make a cast of that using either beeswax or one of the modern materials.

What you now have is a positive image of the part you want to reproduce.  This wax image then has sprue holes attached (wax rods) so the metal will flow into the mold.

The whole works is then repeatedly dipped into a slurry that, when dried and baked, can withstand the high temperature of the molten metal.  At the time of the baking, the wax melts out.

Pour metal into the matrix and, when cool, chip off the outer coating and, voila!  New part virtually identical to the original.

Take care - Elden
http://www.oldengine.org/members/durand 

> -----Original Message-----
> From: sel-bounces at lists.stationary-engine.com
> [mailto:sel-bounces at lists.stationary-engine.com]On
>  Behalf Of Jerry Evans
> Sent: Tuesday, May 25, 2010 12:10 PM
> To: sel at lists.stationary-engine.com
> Subject: Re: [SEL] 8hp Blackstone/cast engine plate