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Sand Cores

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doubleboost:
Hi
Lads
I am about ready to cast the cylinder for my mill engine
The cylinder will be cast in bronze
It is a fair size so a central core will be needed to save on metal and make machining easier
The ingredients i use are
4 Parts silver sand
1 Part clean moulding sand
1 Part core binder (wheat flower)
Temperd (dampend) with molasses disolved in hot water

A piece of steel pipe is used for a mould (this is split full length and held closed with a couple of hose clips)

The dry ingredients are mixed together

The liquid is slowly added untill the mix becomes nice and fluffy

This is lightly rammed in to the tube
A 5mm rod is inserted through the centre (this helpes the core to vent)

The hose clips are releaded and the core gently pushed out on to a piece of steel plate

I only need one but i always make a few and select the best
The next part is best done when the wife is out :slaphead::slaphead:
The cores and plate are cooked in the top of the oven at 200 deg C untill they stop smoking These ones took 40 minutes

Once cooled they should be hard and a bit crumbly
If they are hard like stone the mix was too wet and rammed too hard

A better core is obtained if linceed oil is used instead of molasses but this really stinks the house out
John

Pete.:
My wife would stab me if I did that - I'd probably get away with using the barbeque though.

Fredbare:
Most interesting, and very well shown, thanks, looking forward to see how they turn out.

John

saw:
Nice done, thanks for showing  :thumbup: :thumbup:

Stilldrillin:
Nicely explained, John!  :clap: :clap:

Not too sure about using Herself's equipment........ She would know what I'd been up to, somehow!  :scratch:
I couldn't stand the consequences.........  :wack:

David D

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