how I make sand core's

[dallen]

(08-19-2013, 04:05 PM)doubleboost Wrote: Thanks for that
I have had very limited success with sodium cores
They have been to hard (not collapsing) when the job is poured
I may have been using to much sodium silicate
John

It takes a lot less SS then a lot of people think, all you want is enough to make the sand stick together, the core that I made in that video came out pretty easy actually a lot easier then I figured it would, but it still had too much SS in it, the one I made today when I repoured the part I used even less but a different brand and I had to knock it out with a hammer also, but I'm using a really fine grain sand to make them out of too. a little courser sand would probably let them break down easier.

(08-19-2013, 05:10 PM)oldgoaly Wrote: I haven't tried this yet but I was told it works fine, if you have some cores and put them in a closed container, then feed CO2 slowly in to the container, leave them over night they will get hard just fine. I'm thinking a small plastic bag may work too. I always seem to need 3 hands when holding a core, the hose for the CO2, then the valve....... I do like the smell of molasses baking in the oven! better than it does when de-rusting!

Goaly use a tank with a regulator on it and a blow gun for and air hose. the big thing is to make your cores so you only need two hands, but then I also like the smell of molasses cookies baking in the oven just don't like the extra heat in the house in the summer time

David