[SS-Propellant] casting vibrator

[Rich Nakka]

Mateica Vlad wrote:

>
>
> Rich Nakka <richnakka at rogers.com> wrote:
>
>     Gents,
>     While in the process of organizing a stack of technical notes &
>     correspondences, I came across something of interest. In
>     correspondence with a fellow rocketeer in Denmark some years ago,
>     he told me about a vibrator that he used to aid casting of
>     propellants, which was apparently very effective in helping the
>     slurry to flow and fill all spaces in the mould.
>     3.0 kW motor
>     Eccentric flywheel to produce a 25 Hz vibration
>     Vibration amplitude 2.3 mm.
>
>     Something to consider for our casting of those large 34 kg
>     segments. This may help in maximizing our propellant density?
>
>     Richard
>     _______________________________________________
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>     SS-Propellant at exrocketry.net
>     http://www.exrocketry.net/mailman/listinfo/ss-propellant
>
>  
> Interesting ideea Richard. For some good results we need to calculate 
> the excentric dimensions(diameter, mass) and to make a controlled 
> temperature curing oven. In this way we can cast the propellant 
> segment, put it into the oven(where is the vibrator) and slowly cool 
> the oven so that the density well be maximized. we can't cast the 
> propellant into the vibrating mold. the oven can be made simple with a 
> termostat and a heating coil. the electronic schematic for the 
> termostat cand be provided by Prodan Paul from the safty team(he is 
> making a termostat right now for me to easy my casting procedure)
> Vlad
>
>------------------------------------------------------------------------
>
>  
>
Good ideas, Vlad.
Some things we need to bear in mind.
We may well be casting the segments "in the middle of nowhere". How much 
wattage is available, etc. (a decent gasoline generator should be able 
to provide the power we need?)
For a single firing, 12 segments need to be produced. So the time a 
segment can spend in the "curing box" would be limited. Perhaps have 
several curing boxes?

Richard

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