Okay so I have heard of several different ways of making sand cores. Most involve Sodium Silicate or Baking. So my Question is. In your opinion which one is the best way to go? There are three ways that i have heard of:
mixed with sand and Gased with CO2. Being the easiest and quickest to set. although this is fairly expensive for the beginner Hobby Caster.
Taken from Bugetcastingsupply.comThere is also a lot of information on Jammers Homemade SS here.Mix a fine grained sand (try about a 100 mesh to begin with) with 3% to 4% by weight of the sodium silicate. Mixing can be accomplished in a small container by hand for small jobs. Larger batches can be mixed in a muller.
Pack the treated sand into a core box that forms the desired shape. Insert any wires, rods or other support items as required.
To solidify the core, apply CO2 gas from a low pressure source such as a beverage gas cylinder. The gas can be applied using a hose and any convenient nozzle. The nozzle could be just the end of the tube, or a diffuser such as a standard kitchen funnel. The object is to push the gas thru the core from one end to the other, and activate the sodium silicate to bind the sand. It's also practical place the core mold in a plastic bag and flood it with CO2 to kick off the core inside.
Molasses - Again I have heard of this being used but as of yet have not found a way to do it, so feel free to elaborate.
Taken from HERE
Cores or Stone Cookies Recipe:-
10 litre Silica sand
1 litre Plain Flour
500ml Tap Water
50 ml Molasses
1 Mixing bowl
1 Trigger Spray bottle
1 core box
1 oven (working)
Sift sand and flour into Mixing bowl
Dry mix thoroughly
Place 50 ml Molasses into empty Trigger Spray bottle
Add 500 ml tap water then add trigger cap to bottle.
To be shaken – (not stirred) until mixed.
Spray sand mixture and mull to a good bond is achieved
Ram mixture into corebox
Remove core from corebox
Place core in oven at 180 degrees C for half hour
Allow to cool use the resulting rock as required.
The pleasant odour of the cooking is replaced by a less pleasant version, left in the sand after casting.
Just trying to put everything together in one place for a quick reference for myself.
Myfordboy, if you prefer i not use yours let me know and i will remove it.