AndyBoard - April 2024 - Lab 1 - A Basic Robot - Part 7: Steps 119 thru 124

Follow the steps below to assemble and install the bump sensor gates and the wheels

Step	Procedure	Picture
119	Locate the following parts: two splined pegs (p/n 3749) ; two stanchion tops (p/n 3651 or p/n 32013) ; two 10 unit long axles (p/n 3737) ; two 8 unit long axles (p/n 3707) ; three collars (p/n 3713) ; two 4 unit long linkages (p/n 2825) ; two 3 unit long linkages (p/n 6632) ; two 5 unit long linkages (p/n 32017) ; and two cams (p/n 6575) Note that there are two version of the stanchion top, p/n 3651 and p/n 32013. Either or both can be used here; one of each is shown
120	Assemble the splined pegs, stanchion tops, axles, collars, linkages, and cams to form a bump sensor gate, as shown. This will be the bump sensor gate for the left hand side of the robot, as viewed from inside the robot facing the IR sensors Do not install this bump sensor gate on the robot yet
121	Locate a second set of the following parts and assemble them into a second bump sensor gate, as shown: two splined pegs (p/n 3749) ; two stanchion tops (p/n 3651 or p/n 32013) ; two 10 unit long axles (p/n 3737) ; two 8 unit long axles (p/n 3707) ; three collars (p/n 3713) ; two 4 unit long linkages (p/n 2825) ; two 3 unit long linkages (p/n 6632) ; two 5 unit long linkages (p/n 32017) ; and two cams (p/n 6575) This will be the bump sensor gate for the right hand side of the robot, as viewed from inside the robot facing the IR sensors. Note that this is a mirror image of the left hand side bump sensor gate Do not install this bump sensor gate on the robot yet
122	Working with one gate at a time, install the bump sensor gates on the robot by snapping the four splined pegs into the appropriate holes as shown. Because, apart from the orientation of the stanchion tops and the splined pegs, the two gates are identical, it does not matter, so long as the stanchion tops and splined pegs are positioned correctly, which gate is on the robots left and which is on its right Notice that on one side of the gate, the ends of the axles are, more or less, in a line whereas on the other side of the gate, they are not. The axle ends that do not line up should be toward the center of the robot. Ensure that the top axle can rotate freely with minimal horizontal movement and that there is no contact between axles at the center of the robot. Align the cams carefully so that they actuate the bump sensor when the gate assembly is depressed	Front View Front View Close Up
123	Locate two "Red Rover" wheels (p/n 6582c01). These wheels are assembled from a tire (p/n 6581) and a hub (p/n 6582). Sometimes the wheel and the hub become separated and it may be necessary to re-assemble them.
124	Slide one wheel onto each axle, as shown. The wheels are a "friction fit" on the axles. That is, there is enough friction between the axles and the wheel's hub to keep the wheel in place. Make sure that the wheels are pushed far enough into the wheel cavities in the robot so that they will not catch on walls and the like as the robot drives around. But also make sure that the wheel will not touch any part of the robot as it moves.

That completes construction of the robot.

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updated 18feb19 AC