1. The problem statement, all variables and given/known data The number of teeth in the dial gear of the combination lock system is 40 The number of teeth in the stepper motor gear of the combination lock system is 10 The number of teeth in the dial-stepper connecting wheel of the combination lock system is 80 1) What are the gear ratios between the motor/wheel and motor/dial? 2) If the dial is turned one complete revolution, how many turns do you get on the stepper motor shaft? 3) What is the number of steps in the stepper motor for one complete revolution of the dial? 2. Relevant equations 3. The attempt at a solution Attempt on question 1 Ratio between motor/wheel = 10/80 = 0.125 Ratio between motor/dial = 10/40 = 0.25 Hence ratio between motor/wheel and motor/dial = 0.125/0.25 = 0.5 Attempt on question 2 40/10 = 4 turns Attempt on question 3 Step angle = 360/steps per revolution = 360/4 = 90°/step This step angle seems very high as usually a step angle is something like 1.8°/step so does that mean that this step angle is wrong? Can someone please check if these calculations are right?