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Thread: Thoughts on large, thin sand casting

  1. #11
    This is a CO2 rig that I made using 20 oz paintball tank and fitting off of ebay and some other bits and pieces I already had on hand, the regulator is an O2 regulator from an oxy/acetylene torch set up.

  2. #12
    Junior Member
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    It seems like paintball places are phasing out C02. Though I understand some keg retailers will refill the paintball tanks. I am assuming places selling Kegs (beer) will refill or swap out cylinders. I also have two industrial gas suppliers about 10 minutes from me. One of them is *not* AirGas

    So will it be less hassle or significantly cheaper to go with an industrial cylinder or a keg type cylinder?

  3. #13
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    Argon regs should work on a CO2 bottle, but a cheaper/easier option for a "test run" might be a 16g CO2 cartridge gas injector/tyre inflator.

    e.g. https://www.ebay.com.au/itm/24-x-Bik...p/361767299158

    Long term an "industrial" cylinder will likely be cheapest (assuming you don't have to pay rental on the cylinder, I gather that at least some gas companies in the US still let you own a cylinder these days)

  4. #14
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    I don't have any experience with SS but others here might be able to give an idea of what to expect from its ability to hold the sand in your cope, so you may have some trial and error getting the cope height. As I mentioned, the drag can be pretty thin because its primarily just a supported base. 2" should be adequate as long as your runners aren't too deep. I like to have my pattern and gating at least 1-1/2" from the bottom and 1" from the sides of the flask.
    Myfordboy has a video on his YouTube channel demonstrating SS that's pretty straightforward.

  5. #15
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    Even though we all like to be in charge our destiny, another option would be to send your completed pattern to a professional foundry and have them cast it. Where is the balance point between cost and headache?
    Bones

  6. #16
    You can buy small cylinders >150CF at just about any gas supplier. The bigger ones are usually on rental programs and not worth dealing with it unless you need a refill at least once a month.

    High pressure delivery regulators are NOT cheap. Here is one I have on a nitrogen bottle for struts. It's O2 cousin was another $700. :-/ https://www.amazon.com/Aircraft-Tool...ogen+regulator

    I have one of these for AC work https://www.amazon.com/TurboTorch-03...ogen+regulator It's cheap, but the delivery range is what drives price on regulators. If ya gotta put a couple grand PSI on something, your gonna have to pay.
    WWW.TheHomeFoundry.org
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  7. #17
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    I use a box to flood with CO2 and get a good cure on NaSi and I've got CO2 on my MIG welder but I go the cheap way and put a cup of baking soda in the box then pour some vinegar in it and let it make the CO2. Slide the lid mostly onto the box and the heavy CO2 will push air out the top and cure the NaSi. When it's done boiling I pour off the water and add more vinegar for the next cure. Time is on your side, let it cure an hour if you're unsure but I can cure a 2" section in ten minutes.

    CO2 goes to dense phase about 2,050 psi so they're not really high pressure regulators. You can get a CO2 regulator for $25 if you only need low pressure discharge.

  8. #18
    Senior Member
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    Here is an example of what you are going to deal with if you go the bound sand route.

    https://youtu.be/qPnSb3yzytE

    My Co2 rig, there is a guy on our local CL that delivers various gases. I got this tank for $40, bought the regulator off feebay.

    Last edited by FishbonzWVa; 02-16-2018 at 02:10 PM.
    Bones

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