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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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