[modeleng] Re: Nameplate niggles

Hell I need Glucose!
Patrick Coppens-Marian Lynch wrote:

>Sorry Tony! That should have said Thermit casting, as I haven't eaten 
>yet, I tend to put extra eeee's in things...
>Also 'waist wax' has nothing to do with your hips, (should be waste wax)
>It is actually a welding process, in which you mix powdered Al +  oxide 
>iron.
>The mixture is put in a crucible (steel put(should be pot) with a clay liner 
>and a hole 
>in the bottom)
>In the hole in the bottom is a clay disk, with a stem sticking out of the 
>bottom.
>The mix is ignited by some pottasium permangante and a few drops of glycerin, 
>a 
>lid (clay) is put on the crucible.The Al reduces the iron oxide, and it 
>is an exothermic reaction, that evolves 2500 °C !
>After a couple of minutes, the crucible is held over the gate of the 
>mold. The stem of the bottom valve is lifted, by touching the mold and 
>floats to the bottom.(No it doesn't, it floats to the surface of the molten 
>iron!)
>Very hot liquid iron runs in the mold and the casting is done.
>This reaction can be done with as little or as much product that you 
>want, and needs no external heat source
>
>
>Tony Wells wrote:
>
>  
>
>>What is this "thermite" casting please Patrick? Whilst Tel is our foundry 
>>man, and has made many name plates and such like, in his absence his 
>>technique is to make a small wooden board, fit plastic letters to suit, and 
>>bed this face down into a bed of damp sand. After the board (pattern) is 
>>removed and the sand dried out then it is an easy matter to fill it with 
>>molten lead, though he uses aluminium.
>>
>>I do a lot of lead casting, incidentally, as you are aware, hence my comment 
>>on casting a name plate in it, but such as Chronos also sell various low 
>>melting temperature (bismuth?) based alloys, for model figurines and such 
>>like. Some of these alloys can be melted just with boiling water, and have 
>>excellent low cooling shrinkage rates, so would seem to be ideal for any 
>>personalised name plate, though as I say, they have a range and so some of 
>>their other alloys have higher melting points, just in case the anme plate 
>>ever gets hits with steam!
>>
>>Tony.
>>
>>
>>----- Original Message ----- 
>>From: "Patrick Coppens-Marian Lynch" <develop@xxxxxxxxx>
>>To: <modeleng@xxxxxxxxxxxxx>
>>Sent: Monday, August 20, 2007 6:25 PM
>>Subject: [modeleng] Re: Nameplate niggles
>>
>>
>> 
>>
>>    
>>
>>>Did you ever consider thermite casting?
>>>It is something that can be done on a very small scale, and is not so
>>>difficult, nor do you need fancy equipment.
>>>I have done it twice in the past, for small parts and it worked very well.
>>>You can make your nameplate in wax, so you can use the 'Cire perdu'
>>>method (that is posh for waist-wax)
>>>and have very crisp castings, with high definition..
>>>
>>>Cheers
>>>Patrick
>>>
>>>
>>>R.L. Roebuck wrote:
>>>
>>>   
>>>
>>>      
>>>
>>>>Hi there All,
>>>>
>>>>I'm after some nameplates for a Rob Roy I'm working on. I'm not after a
>>>>personalised name for it, just want them to say "Rob Roy".
>>>>
>>>>     
>>>>
>>>>        
>>>>
>>SNIP
>>
>>
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>> 
>>
>>    
>>
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