Step 9: Motors to run the Three Chains
The gear motors for the project were from from ServoCity (http://www.servocity.com/html/4_rpm_gear_motor.html). They operate on 3 volts to 12 volts dc. I ran them at 12 volts dc for the speed of rotation I was looking for, but these gave me the option to run at a slower speed if necessary.
The motors are also somewhat quiet when operating. I thought this was an important aspect of the clock as I wanted to keep things as quiet as possible.
The sprockets for these motors have 1/2 inch diameter bores but the motors have 6mm (metric) shaft diameters. In order to make up the difference I used 3/4 inch long sections of 1/2 inch diameter nylon rod and then drilled a 6mm diameter hole for the motor shaft. Then I set a #4 by 1 inch long machine screw through a hole that I drilled though the motor shaft.
The motors are also somewhat quiet when operating. I thought this was an important aspect of the clock as I wanted to keep things as quiet as possible.
The sprockets for these motors have 1/2 inch diameter bores but the motors have 6mm (metric) shaft diameters. In order to make up the difference I used 3/4 inch long sections of 1/2 inch diameter nylon rod and then drilled a 6mm diameter hole for the motor shaft. Then I set a #4 by 1 inch long machine screw through a hole that I drilled though the motor shaft.
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