Transmissions

Question 1

What are the pros and cons of belt transmissions?

Answer 1

+ No noise
+ Faster than chain
- Transmits less force than chains
- Can’t be disassembled

Question 2

Why are flat belt pulleys crowned?

Answer 2

It keeps the belt tracking stable and prevents the belt from “walking” off the edge. This is because the belt will walk towards the largest radius due to tension and friction

Question 3

What are the pros and cons with chains compared to timing belts?

Answer 3

+ Chains transmit higher force
+ Chains can be disassembled
- More noisy than timing belts
- Need lubrication

Question 4

What is chordal action / polygon effect and how is it affecting the chain drive?

Answer 4

Variation in speed due to different radius distances. This causes impact, noise, dithering of saw

Question 5

Name the form-based transmissions

Answer 5

Chain-drive, gear-drive, timing belt

Question 6

Name the friction based transmissions

Answer 6

Flat-belt drive, v-belt drive