🔍 Key Concepts

• relationship between pulley diameter and rotational speed in belt-driven systems • difference between motor pulley and spindle (driven) pulley • how changing pulley sizes affects speed vs torque

💭 Think About

• Think about what happens to RPM when a belt runs from a small pulley to a large pulley, versus from a large pulley to a small pulley. • Identify which pulley is driving (motor) and which is driven (spindle), and how changing belt position changes the spindle speed. • Consider which options would actually be used in a workshop versus which are impractical or unsafe ways to change speed.

✅ Before You Answer

• Verify which pulley (motor or spindle) needs a smaller vs larger diameter to make the spindle turn faster. • Eliminate any answers that involve altering electrical connections of the motor instead of using the belt and pulley system. • Confirm that increasing speed at the spindle usually means sacrificing torque by the way the belt is moved on stepped pulleys.