For something completely different this time I picked a water ram. They use the energy of running water to pump a portion of it to a higher location where it is needed. Although they are seldom seen, they are still in use in remote areas. This one of course is just a tiny working model standing only about 5" high.
It started by finding a suitable looking picture. It is a little difficult to read, but the lettering on the prototype reads "The Gould Mfg Co". Two patterns and a core box were required, as can be seen in the above picture.
This picture shows the sand mold with the core in place prior to putting the cope in place to pour the castings. After pouring the casting the sand core is removed leaving the pressure dome hollow.
Here the molten aluminum is being poured into the mold. Extra castings were poured in case there was a defect I would not have to do it over again. They all turned out OK.
With castings in hand the machining started. A few parts or operations each day until it was complete. Then came the testing to see if it would work. At first it would not, but after a couple minor changes and adjustments it took of doing what water rams do, Pump Water. Take a look!
The water supply for this model simply comes from a plastic bucket. A prototype would be placed near a stream.