Todays Project - What did you do today?

[f350ca]

The teeth are aligned to interlock as the centre section slides sideways. This assembly is mounted on an arm that moves it up and down between two fixed pulleys. As its brought up the belt coming from the motor is pulled into the grove forcing the centre section to the left , this causes the belt path on the left to narrow, bringing the belt out to an effective larger dia, while the right dis gets smaller. Similar to the variable drive on a milling machine only using two belts and giving a wider speed range. My Rockwell wood lathe has a similar drive with aluminium shives, it runs very quiet.