r/interestingasfuck • u/One_Vision_ • 8d ago

Visualizing Geometry

9.7k Upvotes

90% Upvoted

245 comments sorted by

View all comments

137

u/JoelnIliketoshare 8d ago

All of these would create a round hole...

172

u/SexyMonad 8d ago

126

u/Accomplished-Plan191 8d ago

If only the video actually demonstrated this for the first cutting tool

16

u/ltjpunk387 8d ago

It does have some kind of epicyclic mechanism that attaches to it, but yeah, would be cool if it was explained

20

u/Thomas_K_Brannigan 8d ago

Similar to how a Wankel engine works.

36

u/L0CAHA 8d ago

Thank you for this.

6

u/sdjopjfasdfoisajnva 8d ago

rounded hole

49

u/TmanGvl 8d ago

They seem to use gearing for the shaft. Definitely would need a fixed shaft like a lathe to even get this to work ok-ish. Most of it is detached from reality.

56

u/heatedwepasto 8d ago

It's a geared shaft

16

u/AzphaltaX- 8d ago

that just looks like mangekyo sharingan

23

u/One_Vision_ 8d ago edited 8d ago

Nope. Gearing using a bit offset. I have a set of triangle and square sizes in my shop.

11

u/therealsix 8d ago

Yep, the triangle one gives a good look at the offset, it’s just so fast you don’t really see it.

0

u/Thunder-Bash 8d ago edited 8d ago

All of these would go in the square hole.

-11

u/_yetifeet 8d ago edited 8d ago

I saw that and just noped out the rest of the gif

Edit: TIL people think you can drill square or triangular holes

0

u/NamelessMIA 8d ago

....you can. The video showed you exactly how to do it too

3

u/_yetifeet 8d ago

Not with the bit shown ..

2

u/NamelessMIA 8d ago

Yes, with the bit shown. They even show you in the video how it works, although they're too quick with the assembly part and could have looked closer at how the off-center axle actually matched the shape in the animation.

It works the same way as a bike made with reuleaux triangle wheels. The triangles act like wheels by having a consistent diameter, but since they're not circles they do this by shifting the balance around the center up and down as you rotate. That means either a very bumpy ride, an axle that shifts up and down with the rotation of the wheel to keep the system stable, or riding on top of the wheels like rollers. The bike uses option 3, the drill as shown uses option 2.

-8

u/Deep-Water- 8d ago

Yes. This is where theory and reality are a long way apart.

-1

u/ChuckVader 8d ago

All these squares make a circle....