Hyperboloid Made of Coaster and Elastic Cord
by HandicraftRecordBook in Workshop > Woodworking
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Hyperboloid Made of Coaster and Elastic Cord
![Hyperboloid](/proxy/?url=https://content.instructables.com/F6L/S6UD/KSN815FM/F6LS6UDKSN815FM.jpg&filename=Hyperboloid)
![hyperboloid.gif](/proxy/?url=https://content.instructables.com/F4V/IRQ5/KSONG3Z4/F4VIRQ5KSONG3Z4.gif&filename=hyperboloid.gif)
![Material.jpeg](/proxy/?url=https://content.instructables.com/F6I/SB31/KSONFYCP/F6ISB31KSONFYCP.jpg&filename=Material.jpeg)
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
Draw the Position to Make a Hole
![Drawing 24 evenly spaced points](/proxy/?url=https://content.instructables.com/F1O/6S1S/KSONFYRR/F1O6S1SKSONFYRR.jpg&filename=Drawing 24 evenly spaced points)
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.
Make a Hole on the Circumference
![Step2.jpeg](/proxy/?url=https://content.instructables.com/FBK/N8NU/KSONFZ29/FBKN8NUKSONFZ29.jpg&filename=Step2.jpeg)
Drill a hole at the drawn point. (same diameter with elastic cord)
Stack two coasters and make holes at once.
Make Center Hole
![Step3.jpeg](/proxy/?url=https://content.instructables.com/FDX/VWT0/KSONFZ2A/FDXVWT0KSONFZ2A.jpg&filename=Step3.jpeg)
Make a hole in the center.
Hole size is little bigger of the wood screw for free rotation.
Make a Hole in the Center of the Stick
![Step4.jpeg](/proxy/?url=https://content.instructables.com/FSQ/UPOO/KSONFZNQ/FSQUPOOKSONFZNQ.jpg&filename=Step4.jpeg)
Make a hole in the center of the stick both side.
Hole size is according to wood screw.
Assembly Coasters and Stick
![Step5.jpeg](/proxy/?url=https://content.instructables.com/F87/JT7R/KSONFZPD/F87JT7RKSONFZPD.jpg&filename=Step5.jpeg)
Assembly the coaster and stick with screw.
One side should be tight.
Leave a space on the other side for free rotation.
Pass the String Into the Hole
![Step6.jpeg](/proxy/?url=https://content.instructables.com/F0Q/WSPM/KSONG0FB/F0QWSPMKSONG0FB.jpg&filename=Step6.jpeg)
Thread the string between the two coasters in order.
Complete!
![twist.jpeg](/proxy/?url=https://content.instructables.com/FR6/LFUV/KSONG39O/FR6LFUVKSONG39O.jpg&filename=twist.jpeg)
![Hyperboloid_shape.jpeg](/proxy/?url=https://content.instructables.com/FNW/97XU/KSONG3HN/FNW97XUKSONG3HN.jpg&filename=Hyperboloid_shape.jpeg)
Let's twist!
The shape you find is hyperboloid of revolution.