GARY'S AUTOMATIC SIFTER INVENTION
This is myself and Bud Kroneke with the only known photo I have of my sifter where this particular photo was taken in 1999 at Line Creek Park during salvage operations.
I always noticed students spending too much time at the sifter with many waiting in line and so I set to work to come up with a electric sifter. The motor, flywheels and belts, came from an old washing machine. The frame was from old bed rails and the round iron was from something my dad had laying around. Besides some nuts and bolts, the only thing I had buy was the front wheel. The wheels on the sifter part came from a couple old lawn mowers and the handle grips from an old mini bike.
I made several different actual screens of different sizes depending on the dirt. We used bigger 1/2" screens for wetter dirt and 1/4" screens for dry dirt. The arm that shook the screen worked like a old locomotive engine and it took some testing to get it just right. To do this, I drill different holes in the flywheel where I tried the arm in different holes until we got just the right speed and never had to change it.
The contraption was built to move forward leaving mounds of dirt as we went. It could easily sift a full 5 gallon bucket of dirt in less than 30 seconds! It had an on-off switch by your knee to easily stop it. In the early days we ran it off a generator before th Renner Site had electricity. Later, I bought 250' of wire and it ran off that. At Line Creek, we ran the wire the full 250' to the old museum.
On a typical Saturday, it would easily run 120 gallons of dirt in 6 hours. The only thing that ever broke on it was the switch of all things! What you can't see in the photo is the motor had a metal cover over it made from an old shovel. This protected it from both dirt and rain.
I would estimate it easily sifted over 3200 cubic feet of dirt.