Introduction: Hyperboloid Made of Coaster and Elastic Cord
Hyperboloids are beautiful curved surfaces. It is a curved surface, but it consists only of straight lines. This instruction uses a coaster and a rubber cord to make this hyperboloid.
Supplies
- Coaster x2
- Elastic cord (3m)
- Wood stick (10cm)
- Wood screw x2
Step 1: Draw the Position to Make a Hole
Draw a circle on the paper that is the same size as the coaster.
Divide the circumference into 24 parts and draw a point at the position to make a hole.
Step 2: Make a Hole on the Circumference
Drill a hole at the drawn point. (same diameter with elastic cord)
Stack two coasters and make holes at once.
Step 3: Make Center Hole
Make a hole in the center.
Hole size is little bigger of the wood screw for free rotation.
Step 4: Make a Hole in the Center of the Stick
Make a hole in the center of the stick both side.
Hole size is according to wood screw.
Step 5: Assembly Coasters and Stick
Assembly the coaster and stick with screw.
One side should be tight.
Leave a space on the other side for free rotation.
Step 6: Pass the String Into the Hole
Thread the string between the two coasters in order.
Step 7: Complete!
Let's twist!
The shape you find is hyperboloid of revolution.
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