![]() Okay, so perpetual motion failed miserably. SPOILER ALERT - If you haven't gone through steps 1-3 or you want to keep believing in perpetual motion, please don't read this step. In retrospect, I should have protected it better during drilling, cutting, and sanding. NOTE: As you can see from the photos, I scratched up the surface of the CD quite a bit during the building process. The cap nuts should face the front (shiny side) of the CD. STEP 9: Insert screws, washers, and cap nuts through the slots. Some CD labels cover this area so the tape won't be needed. I added a piece of silver tape under the gear to hide the gear teeth from the front of the CD. STEP 9: Hot glue the plastic gear to the back side (label side) of the CD making sure to center it. The weights must slide freely, so be sure to remove any burs or narrow areas in the slots. STEP 8: Clean up the slots using a Dremel. Make sure you securely brace the CD and cut in a slow, smooth motion. STEP 7: Use a Cutout Tool with a 1/8" cutting bit to make the slots between each set of holes. STEP 6: Drill the holes first being careful not to crack the CD. See my note at the end about protecting the CD while drilling and cutting. STEP 5: Cut out and tape the pattern to a CD. ![]() STEP 4: Join the holes to make a 1/8" slot for each hole pair. STEP 3: Measure half the distance between each hole and the center of the CD and add another 1/8" hole for each dividing line. STEP 2: Add a 1/8" hole 1/4" from the edge of the CD for each dividing line. STEP 1: Lay out the design on paper by dividing the CD into eight equal sections. I figured the slots needed to be angled from the center of the CD out toward the edges so the weights would slide "out" as each slot reached the falling edge and slide "in" as each slot reached the rising edge of the CD when turning clockwise. ![]() I decided to cut slots in the CD and use weights made of screws, nuts, and metal caps to slide back and forth in the slots. ![]()
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