Hi all

Im currently stuck with a question and would be very greatfull if anyone can help.

If a small VRO (verticaly rotating object) was moving at a rate of 10rpm (revelutions per minute) and consuming 10 volts of electricity and I wanted to use it to move a VRO witch is twice as big and needed to travel 20+rpm's could i do it using a gearshift mechanism like the one you find on mountain bikes and connected in the same way with eather a chain or a belt.

If this can be done what would be the mathematical formula for this.

Thank you for taking the time to read this and i hope you can help