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WORM GEAR EXAMINATION QUESTION

V. Ryan 2003

 

The system opposite is used to control a set of traffic lights. The mechanism involved includes a motor which drives a worm gear round, turning a wormwheel and the attached cam. As the cam rotates it hits a micro switch which turns on a light

If the cam turns at one rev per minute (rpm) and the wormwheel has 110 teeth, how fast does the motor rotate?

   
First work out the gear ratio:  
   

   
The worm gear always rotates at a faster rate than the wormwheel.

RPM is 110 X 1 = 110 rpm (motor rotates 110 times per minute)

The worm gear and motor rotates 110 times to every single rotation of the wormwheel.

   

 

   

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