Fallout 4 Gatling laser

Projects General Guidance
8

So i´m on the way!
Got the thing working with this tutorial and a 9V battery and motor.
But when i use the same ting with my 14,4V battery and motor all I get is a buzzing from the motor...
Trying the battery and motor directly still works fine.

http://forum.hobbycomponents.com/viewtopic.php?f=76&t=1872