A STEM Project: A Crank That Moves a Rod In a Circular Motion

A crank is a mechanism whereby a rod is attached at a right angle to an axle. When the axle is moved, the rod which is connected to the axle moves in a circular motion.

Here is a video of the crank in action.

Make the Small Presentation Box

Using the directions from this blog posting, make the small presentation box. https://papercraftetc.blogspot.com/2019/02/rectangular-and-square-presentation-box.html

Make the Crank Mechanism

Here is the PDF. I used 65 lb cardstock.

https://drive.google.com/file/d/1bTHV2i8aXMZ57ZRtqOXuOdKKWmK2p0-H/view?usp=sharing

Here is the .Studio file for the Silhouette.

https://drive.google.com/file/d/1OqZkVaxtiKUeJUEOdasMHJaf0zix72yq/view?usp=sharing

Here is the SVG for all other cutting machines. The file goes beyond the viewable area.  Zoom out to see the entire file.

https://drive.google.com/file/d/1H-eoDzMiESCdJwbpoTJgYXgxo7xO0oQl/view?usp=sharing

Make the axle.  There is one more piece that makes the axle but it is not shown.

Apply glue to the tabs and make a prism out of each piece.

Apply glue to the interior of both three sided pieces.

Bad photo but the two pieces are facing away as an L shape.  Make the center cross piece by gluing into a prism and glue the interior of both three sided pieces.

Insert the center cross piece.  The axle will look as above.

Apply glue to the rod and make into a prism.

Crease the end of the rod.

Fold the rod tab around the center cross piece. Apply glue to the tab on the rod as shown above.

Attach the tab to the rod to create a loop around the axle.

Place the axle into the presentation box.  Apply glue to the axle tabs.

Slide on the decorative gear and adhere the axle tab.

Apply glue to the decorative tab and adhere it to the decorative tab on one side.  On the other side, make the crank handle and then insert it into the side of the decorative gear.  Apply glue to the crank handle and adhere the tabs. 

Apply glue to the underside of the decorative gear and adhere to the other side of the box.

Apply glue to the top of the presentation box and adhere the square top.

The crank mechanism can be rotated in either direction to create a circular motion.

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