Page 23 - DYNO TTRAINER

15. Spur gears

Specifications:
Metal spur gear, 48 teeth, 64 diametral pitch (DP), 20 mm, 2 mm thick – 1 piece

Plastic spur gear, 100 teeth, 64 diametral pitch (DP), 40 mm, 3 mm thick – 2 pieces

Material Characteristic:

• Teeth mesh perfectly with no abnormal noise or wobbling

• Locked into a train connecting motor and rear roller
• Surface finished with lubricating oil after fabrication

Usage Rational:

The metal gear functions to connect to motor spindle, locked by a key, while the
other two plastic gears are subsequently connected to the roller. The main reason

for choosing both plastic and metal gears is that plastic gears are not strong enough

to drive the motor, while metal gears create lag from the roller to the motor. A
combination of both makes the gear train a complete and functional one. 3 gears are

needed as the direction of the roller spinning is has to be the same with the motor,

so the second gear in between only functions to change the direction of spin. The
diametral pitch, meaning the space between teeth of gears, have to be the same for

them to be able to mesh together.