Check out Rob’s ice cream machine… via Tim.
These are two photos of an ice cream machine made by a local Mennonite. It uses a small gas engine and pulleys to tun the crank for the ice cream. The engine also helps bring the temperature of the consumer grade anti-freeze to -67 F in the coils. The whole entity sits on a small pull wagon. The ice cream takes about 5-10 minutes to make. Cool stuff.
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Anti-freeze has (I’m told) a sweet taste. A leak into the ice cream might go undetected. Very poisonous.
Standard antifreeze uses ethylene glycol. Propylene glycol may be substituted and is non-toxic (in fact, it is approved as a food additive).
Haha, I recognize the engine as a 6.5 horsepower Harbour Freight Special. They are on sale this month for just over $100. I just got mine this morning as a backup for a generator for Hurricane season. Plus you can mod it to run on 100% ethanol pretty easily. Would be interested to see some more specs on the cooling aspect of this setup…
Cheers,
Bill.
I would like to see specs also. I make about a gallon of ice cream a week and am getting tired of the poor quality of the commercial machines like Rival.
Hmmm, how do you get ethylene glycol down to -67F. It becomes solid at a much higher temperature. Are they using a two part system transferring from a different refrigerant to the ethylene glycol?