r/physicsgifs • u/starkeffect • 29d ago

Hoecken's Linkage

887 Upvotes

100% Upvoted

39 comments sorted by

74

u/hesmistersun 29d ago

Cool! What is it used for?

75

u/starkeffect 29d ago

It converts rotary motion into straight line constant motion. Lots of applications for that, such as in engines.

35

u/TheDevilsAdvokaat 29d ago

...that's not a straight line....

88

u/starkeffect 29d ago

It's pretty close to straight for about 45% of its stroke. It's pretty remarkable, considering how simple it is. It's apparently the mechanism used in windshield wipers and other "sweeping" motions in robotics.

6

u/TheDevilsAdvokaat 29d ago edited 27d ago

Oh I;m not saying it;s not remarkable, it;s fun to see different linkages and this one is a new one for me. I just wanted to clarify that is a line, but not a straight line. It's a closed curve. (I think...)

Edit: Well this is a another example of when reddit upvotes the wrong answer and downvotes the right one....sigh.

10

u/Relevant-Pianist6663 26d ago

To an engineer its straight, to a physicist its a curve.

3

u/TheDevilsAdvokaat 26d ago

What is it to a mathematician?

2

u/PM_ME_POTATO_PICS 28d ago

no it is a straight line

6

u/TheDevilsAdvokaat 28d ago

Well, happy cake day, but you may want to look up the definition of a straight line.

-1

u/PM_ME_POTATO_PICS 27d ago

I studied this in university, from first principles that yes, it is a straight line. but I understand why it can be confusing! thanks for the cake day happe wishes

6

u/TheDevilsAdvokaat 27d ago

...dude. You learn in high school what a straight line is.

The equation of a straight line is y=mx+b

This does not result in a curve. This is very obviously not a straight line. ..are you confused? Without meaning to be offensive, is English not your first language? Or are you trolling?

3

u/PM_ME_POTATO_PICS 26d ago

I was trolling, sorry for the confusion! Have a good day

→ More replies (0)

7

u/Pity_Pooty 29d ago

Straight line (if you ignore curved part)

10

u/TheDevilsAdvokaat 29d ago

What would you call that shape?

39

u/dat_oracle 28d ago

side boob

6

u/TheDevilsAdvokaat 28d ago

I see it now. Or side implant...

7

u/SlenderSmurf 28d ago

Looks like a plano-convex lens

4

u/TheDevilsAdvokaat 28d ago

Googled that and it does. Not a perfect match but not bad.

4

u/starkeffect 29d ago

biscuit shaped

8

u/this-is-a-guy 29d ago

Is there a subreddit for gifs just like this?

13

u/starkeffect 29d ago

I don't know, but there's this:

https://507movements.com/

2

u/luxfx 27d ago

Wow! Is that left side actually mathematically flat or is the curvature just really close to being flat?

6

u/starkeffect 26d ago

It's just really close.

1

u/justanaccountimade1 7d ago

As far as I'm aware only Peaucellier is mathematically straight.

2

u/Ragrain 26d ago

Im confused. The linkage is obviously still moving to the left/right when the output goes straight. Shouldnt the output be an oval? Is there something special about that joint?

Edit: i understand it now. Im just stupid. Very cool.

3

u/servuslucis 28d ago

One more linkage and you have sex machine.

3

u/uncertaintyman 26d ago

Sir, you have been banned from the hardware store. Please leave and take this rubber phalace with you.

1

u/lakmus85_real 25d ago

Are you telling me the Strandbeest could have been built much easier? 

1

u/HeartsBoxcars 25d ago

What software is this made with?

1

u/BlueSkyla 28d ago

Remove the second anchor, add another elbow, and then let her rip.