Step 2: X Axis

We are calling the inner ring the "X Axis".

We basically man-handled this together on the bench vise. If you have a bending brake, then we are envious :-)

The X axis needs to be the size of the Lego plate you will be using, so for the Lego Large Green Baseplate (item #626), it should be 10 inches x 10 inches. For the Lego X-Large Gray Baseplate (Item #628), it should be 15 inches by 15 inches. For the rest of this Instructable, we'll use the green baseplate measurements.

We cut the 1" aluminum bar it to length, then marked where the bends should go. Then we clamped the bar in a bench vise to bend it. Note the connection is in the middle of one side rather than the corner. This made sense to us since we get the extra thickness for the axle, and it seemed like it would be easier to join it on a side rather than a corner.

Once it was bent into shape, we used a smaller piece to join the ends, and used 4 #6 bolts to hold it with nuts and split lock washers.

In the middle where we used the small plate to join the ends, we placed a 1" #6 bolt pointing out of the ring. This will be the pivot for the X Axis.

On the opposite side, we placed a servo horn. We drilled a large hole to fit the plastic ridge around the center (on the other side of where the servo attaches), then used a couple #6 screws to mount the servo horn. the horn is mounted on the outside of the ring. The large hole in the center allows the servo set screw to be tightened from the inside.



















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