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[abby]

Hi all, thought some of you might be interested to see the next patterns for the 5" gauge "Castle/King" castings I am making for a client.
I will be tackling the inside and outside guide bar brackets next.



the Outside frames are straight forward and I have designed the pattern so that both the L/H and R/H versions are accomodated.
This saves the expense of two patterns and two silicone rubber moulds.

The inside frame is more complex , although smaller than the inside motion frame , which I already made , it also supports the front bogie.
Removing an intact wax from the mould will be challenging.





I also have a personal job that I would like to get done!



The handles on some of my machines are a bit tatty so I want to cast a few of these in nickel silver.
They should look as good as chrome after polishing.
Dan.

[donashton]

Hi Dan,

Thanks for sharing your fascinating work. I should have thought that nickel silver was prohibitively costly, and its beautiful polish would need regular attention. That is not intended to be critical - as a woodwind repairer I'm familiar with the material and interested in your choice.

Best wishes,
Don.

[abby]

Don , nickel silver was used for such items as stirrups , horse bits and other bridle fittings before the invention of stainless steel.
It was also used for cutlery of course , usually with a silver plated finish , it keeps it lustre and requires only an occasional polish.
As for cost , a visit to almost any car boot sale will provide large quantities of old forks and spoons very cheaply , farm sales are a good source for old horse bridle.
I have at least 20 kg in stock and make some of my G1 fittings from it.
Dan.

[Cro]

Dan,

Will watch with interest as I am still considering the parts we spoke about recently for the new year when funds are healthier.

Be good to see how these parts come out as the bits I am looking at are rather complex and have a lot of fine detail which is extremely important on them!

Happy Christmas, don't spend to much of it working!

Adam

[jem]

Hi Please can you tell us what is the melting point of Nickel silver, and the pouring temperature.

best wishes

Jem

[abby]

There is a very wide range of cupro-nickel alloys and a wide range of melting points.
The metal that I have in stock came from a "horse furniture " factory in Walsall which closed in the 1960's, it has a melting point of around 1100°C and a pouring temperature of 1200°C.
This alloy is excellent for sand castings but is pretty much near to the limit for gypsum based investment cements.
There are alloys with melting points as low as 1000°C.
Dan.

[jem]

Hi Abby,

Thanks for that information, I have been doing bit of aluminum casting, nearly always using expanded foam which I find excelent for complicated shapes, but now I would like to have a go with other metals. being able to make castings has opened up a completely new door for me in engineeing.

best wishes

Jem

[Vera 3DCompare]

Dec 24, 2015 21:05:39 GMT abby said:

Hi all, thought some of you might be interested to see the next patterns for the 5" gauge "Castle/King" castings I am making for a client.
I will be tackling the inside and outside guide bar brackets next.

the Outside frames are straight forward and I have designed the pattern so that both the L/H and R/H versions are accomodated.
This saves the expense of two patterns and two silicone rubber moulds.

The inside frame is more complex , although smaller than the inside motion frame , which I already made , it also supports the front bogie.
Removing an intact wax from the mould will be challenging.

I also have a personal job that I would like to get done!

The handles on some of my machines are a bit tatty so I want to cast a few of these in nickel silver.
They should look as good as chrome after polishing.
Dan.

Hello Dan,

Thanks for sharing your amazing work! 


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