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The targets are distributed on two levels of target subassemblies, and each level has three foreground targets moving on a single sliding platform and one stationary target in the background. Each sliding platform, constructed of Lasercammed acrylic, slides left and right inside two horizontal aluminum C-channels "rails" whose open sides face each other. The sliding acrylic platform has holes drilled to secure a motor (holes are for both the motor shaft and motor body stabilizing screws) and a slide switch that allows the motor to change directions. Each C-channel is glued onto an acrylic strip, which is in turn secured with screws to a roughly 3 ft-long 2x2 piece of wood that is screwed into the overall wooden game frame. |
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| CAD Model of moving target mechanical design |
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| Motor on moving target | Eye-bolt and fishing wire attachment at frame ends |
The horizontal motion of the targets is actuated by the motor on the sliding platform cooperating with a piece of taut fishing line secured by its ends, tied onto eyebolts on the sides of the game frame. The motor shaft points downward and has a shaft collar that creates a "spool" for the fishing line to wrap or unwrap around the shaft as the shaft rotates. Because the fishing line is secured at its ends, the wrapping or unwrapping motion of the fishing line pulls the sliding platform left and right within the C-channels.
| The movement of the sliding platform changes direction when the slide switch on the sliding platform hits one of the tab extensions (partially visible in the above CAD model) on the acrylic strips below the C-channels. The slide switch, located behind the center target on the sliding platform, is attached to a circuit with an inverter and an H-bridge (see Electronic Design) to change the polarity of current supplied to the motor and hence, the direction of the motor shaft rotation and direction of the sliding platform movement. |  |
| Close-up of switch and stops |