Re: [PSUBS-MAILIST] Water nozzle propulsion

[Ray Keefer <psubs2001@yahoo.com>]

Hi Bill,

Sorry, I can't be much more help. I did the lost wax
process back in 7th grade. For the real details you
are going to have to contact a local jewler or visit a
library.

Regards,
Ray

--- Akins <lakins1@tampabay.rr.com> wrote:

> Thanks Ray, I didn't previously know that. I was
> just remembering the lost wax process from an old
> National Geographic article 
> I read probably 30 years ago about indians in
> Arizona making silver jewelery using the lost wax
> process. Strange how some things
> stick in your mind for many years yet I can never
> remember which day the garbage man comes! Grin.
> 
> Your explaination leaves me with several questions.
> If the kiln is sealed and the wax vaporizes out of
> the mold located inside the kiln, when the kiln
> is cooled and you open it to retreive your mold,
> where did the wax go, is it now cooled and reformed,
> coating all over the inside of the kiln, as well as
> all
> over the outside of your now cooled mold, or does
> the wax somehow become totally destroyed due to the
> heat and is not able to reform
> later when the kiln cools down? If this is true,
> does it become carbonized and appear as ash inside
> the kiln? I know matter cannot be destroyed (except
> by antimatter) but only
> changed into other forms, so if the wax is totally
> gone from the kiln and the kiln is totally sealed,
> what does the wax become? Or does the kiln have a
> vent to allow gas to 
> escape and the wax escapes as a gas? It's been a
> very long time since I last saw or used a kiln. High
> school actually, and I don't remember if they were
> vented or not.
> Also, do you make holes in the bottom of your mold
> so the wax can run out or does it make no difference
> whether
> the drain/vent holes are at the top of the mold or
> the bottom and the wax would vaporize out either
> direction?
> 
> I'm interested in this because I have need to cast
> some small parts for one off prototypes for my
> firearm accessory business. 
> I have previously been making them by hand out of
> solid bar steel. That takes too much time and effort
> compared to casting. 
> 
> As always, thanks for the helpful info.
> 
> Bill Akins.
> 
> 
> 
>   ----- Original Message ----- 
>   From: Ray Keefer 
>   To: personal_submersibles@psubs.org 
>   Sent: Tuesday, April 11, 2006 2:38 PM
>   Subject: Re: [PSUBS-MAILIST] Water nozzle
> propulsion
> 
> 
>   Hi Bill,
> 
>   There is another step on the lost wax process.
> Once
>   the mold had hardened around the wax. The mold is
> put
>   into a kiln. At high heat the wax vaporizes out of
> the
>   mold.
> 
>   This leaves the cavities empty for the moltant
> metal
>   to fill. Otherwise the wax may not completely
>   displaced by the moltant metal leaving an ill
> formed
>   duplicat.
> 
>   Regards,
>   Ray
> 
> 


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