Use a homemade cam to make a swinging and dancing robot! Look carefully at the picture above. Just turn the pole below to make the robot swing left and right, as if it is dancing. And because of the base, it won’t tip over!~
Materials and tools: corrugated cardboard, plastic bottles, bamboo skewers, hot melt glue gun, straws, scissors, cardboard, markers, twist sticks.
Make a robot using twist bars and cardboard, making sure it is the right size.
Mark 3 inches down from the mouth of the mineral water bottle and cut it out.
Punch two holes near the bottom of the bottle.
Cut two 1-inch straws, apply hot glue to the outside of the bottle hole, and insert the two straws into the holes. Place the skewers inside the straws to make sure they line up before the glue dries. This is where the cam lever will stop and rotate. Remove the bamboo stick after the glue dries.
Cut out two cardboard circles: one 1.5 inches in diameter and one 1.25 inches in diameter. Cut out two cardboard squares, 0.5" x 0.5" each. Punch holes in the smaller cardboard circle (off center!!! very important!) and also punch holes in the two square cardboard circles (in the center).
Cut a 2-inch piece of straw, apply a generous amount of glue to one end of the straw, and insert it into the hole in the middle of the cardboard circle, making sure the straw is firmly attached to the cardboard. Put it into the bottle and pass the straw through the mouth of the bottle.
Insert a rectangular cardboard onto the bamboo skewer and stick it with glue. Thread the bamboo skewer through one of the straws on the bottle, insert another cardboard circle inside the bottle, then pass through the second straw and add a second cardboard rectangle and glue it in place.
Test the rotation, if the cam is too big you need to cut it smaller.
Thread the bamboo skewer into the vertical straw so it should extend at least 0.25 inches and install the robot.
Turn the cam and the robot will swing and dance~
