Is it a straight line or a circle? ••• Even though the dots trace a straight line, the wh… — @engineezy

Video insights

@engineezy's TikTok video "Is it a straight line or a circle? ••• Even though the dots trace a straight line, the whole thing is caused by interesting rotational geometry. Underneath the panel there's a 30-tooth gear rolling around inside a 60-tooth ring gear, exactly twice its size. When a gear rolls inside a ring twice its size, every point on its pitch circle travels in a perfectly straight line, so there's a magnet at each of those points dragging a dot back and forth on top of a solid panel. The circle you see is really just that hidden gear, traced out by eight dots. It's called a Tusi couple. ••• #engineering #mechanicalengineering #mechanisms #gears #kineticart" has 1,128,317 views, 18,123 likes, 79 comments, 236 shares in the public metrics captured by this index. That is an engagement rate of 1.63% (likes, comments and shares over views). It was posted 7 days ago and runs 35 seconds. It has been saved 1,440 times.

Frequently asked questions

How many views does this TikTok video have?

The capture indexed here reports 1,128,317 views, 18,123 likes and 79 comments.

Who posted this TikTok video?

It was posted by @engineezy, who is linked from this page.

What is this TikTok video's engagement rate?

Across the captured metrics the engagement rate is 1.63% (likes + comments + shares over views).

When was this TikTok video posted?

It was posted on 2026-10-18, 7 days ago.

What hashtags are used in this video?

The capture links 1 hashtag, starting with #engineering.

How long is this TikTok video?

The captured clip runs 35 seconds.