This is a pic our first system. It is a bit crude but for someone just wanting to start out on a budget, it is a basic overflow system that can be modified to suit your needs. We had a double ladle Stewart shot maker (Not a black Max)The coolant we used then and still do is Automatic Transmission Fluid. This system made the best shot we have ever produced bar none. Our new one is a lot faster and we now have the ability to run for as many hours as you can stand to feed it. The shot it produces has never been as round as this simple first design.
On the far right is an automatic transmission cooler. It is mounted into a heat register boot and there is a duct booster fan mounted below to blow cool air across the cooler. It worked great.
The collector box consisted of a 20MM ammo can set inside a large plastic tote. Not real scientific. The trans fluid was circulated by a ProCon pump (look them up on ebay). They are a great pump for this application especially if you are using an oil as a coolant. The fluid drawn from the overflow tank through the pipe seen hanging over the side to the procon pump. It was then pumped up through the black pipe seen mounted to the wall past the ball valve and through the trans oil cooler and then back into the collection tank where the process repeated itself. We could make shot until the shot had filled the 20MM can to about 3 inches from the top. We then had to shut down and scoop out the shot and then fire everything up again. A cheap digital thermometr was always in the tank to monitor fluid temp. The best shot was always made in the 125-150 degree F range. I'm sure this had everything to do with viscosity of the fluid.
When it was time to shut down for the day, we shut the ball valve on the horizontal pipe and opened up the one on the vertical (which was also used to regulate the flow of coolant as not all of the coolant could be sent to the cooler) and pumped all of the fluid back onto 5 gallon sealed pails for next time. This helped keep unwanted crap (flies, dirt, mice etc) out of the fluid. Simple but this thing made a couple tons of fine shot before we moved on to plan B.
I have posted pics of this one before but this is our shot sorter. The unit came from Harbor Freight. One of their cheap mortar mixers. Mounted a 5 gallon pail and fastened some screen from McMaster Carr supply of the appropriate size to sift out the big ones. A large tote was place underneath the sorter to catch the shot as it fell out of the mixer. Easily sorted 250 pounds in 15 minutes.