Square Hole Drill? How about a Constant Velocity Joint!

Being able to draw a rounded corner square with an off-centered triangle is the principle behind square hole drill bits

Universal Joint

Universal joint

A universal joint.

Universal joint, how about a planetary gear

Straight bar passing through a curved hole

Giving a Sniff to The Ol' Cat Hole

Simulation of falling in a black hole

''Completing the Square''

On a chessboard, a knight can visit each square exactly once.

Peeling apples with power drill

Line square cube hypercube

Talk about a hole in one!

Friction Drill

Being able to draw a rounded corner square with an off-centered triangle is the principle behind square hole drill bits

Universal Joint

Universal joint

A universal joint.

Universal joint, how about a planetary gear

Straight bar passing through a curved hole

Giving a Sniff to The Ol' Cat Hole

Simulation of falling in a black hole

''Completing the Square''

On a chessboard, a knight can visit each square exactly once.

Peeling apples with power drill

Line square cube hypercube

Talk about a hole in one!

Friction Drill