What is the Spin Those Gears 2 game, how does it work?

According to the introduction of Jan Kerekes, Spin Those Gears 2 is a Puzzle game on the Android platform. There is currently a 1.10 version released on Jul 18, 2016, you can see the details below.

Spin Those Gears 2 is gear (cogs) based puzzle game, where you have to construct various gearings (or gear trains) to make specific gears to spin at particular speed.

Having a correct gear ratio is important in this game, but remember, time is against you. The faster you complete the level, the more score you gain.

This game comes for free with 15 levels with no disturbing in-game ads as a trial. If you like it, you can upgrade and get full version of application that includes all 40 levels - just for an average price of cup of coffee. Upgrade is available as in-app purchase directly from main menu.

So, are you able to fix the machine by making it's gears to rotate at right speed?