A simple but reliable mechanical slot machine.


This slot machine was designed to be the most reliable and most simple as possible. It is composed of a mechanism which stores the lost ball thanks to a ratchet, a mechanism which sets the probabilities and a mechanism which loads the balls. The ball is loaded in the entrance of the machine, then the action of the main lever pushes it in the rear and the ball rolls over the slides. The probabilities mechanism is composed of slides and triangle parts which divide the way into two possibilities. There are two triangle parts therefore one chance over four to win each time.


When the ball rolls on the right slide and fall on the red part, the trap door is opened. Then after using the lever, the trap door is re-locked thanks to the ratchet mechanism. You can see the ratchet mechanism on the right of the machine. The ratchet mechanism and the load mechanism is linked to the main lever which is put back with a rubber. Simple, reliable and very fun !

The building instructions are available. You can watch them by browsing my website or

Download the Zip Archive of the Slot Machine’s instructions, 7 mo, ZIP.

Designed in 2011

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