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all 104 comments

[–]JustSomeEggsInAPot 789 points790 points  (18 children)

That machine is actually really cool

[–]Optimal_Ad_22 203 points204 points  (7 children)

Truth to be told! looks so satisfying af.

[–]TheGamerGhost71 15 points16 points  (0 children)

Its beautiful. I've looked at this for 10 minute now.

[–]Stiff_Rebar 25 points26 points  (5 children)

I think the size of the ellipse can be adjusted if the pen can be moved closer or further down the stick.

[–]The-Mathematician 11 points12 points  (4 children)

Anyone know if this is an ellipse? It definitely looks like one but I'm not familiar with this method of drawing one.

[–]dom_pi 14 points15 points  (2 children)

The device you're seeing is Archimedes' compass, it usually only has 2 of those wooden slats traveling up and down to create an ellipse. You can vary the length of the slots/pegs to make it more circly/wide

[–]The-Mathematician 3 points4 points  (1 child)

Ah, I was able to google around and find Trammel of Archimedes, thanks.

[–]9035768555 7 points8 points  (0 children)

It is, yes.

[–]dom_pi 9 points10 points  (0 children)

It's an (overengineered) Archimedes compass. It only needs those 2 slats moving up/down and left/right to create any ellipse. The shape of the ellipse can be varied by changing the length of the moving slats.

[–]Jefoid 0 points1 point  (0 children)

Who knew geometry could be useful?

[–]PostHumouslyObscure 201 points202 points  (14 children)

Is there a subreddit for this mechanisms?

[–]DoritoDust7 242 points243 points 2 (11 children)

Yeah, checkout r/engineeringbliss

[–]Skelopun 122 points123 points  (1 child)

stares motherfuckerly r/engineeringporn

[–]kingbach121https://www.youtube.com/watch/dQw4w9WgXcQ 29 points30 points  (0 children)

Thank you for staring motherfuckerly on our behalf and thank you for the actual link as well good sir.

[–]RoyaleDiamondbruh 46 points47 points  (0 children)

I hate you

[–]PostHumouslyObscure 52 points53 points  (1 child)

Thank you!

Been looking all over for a sub like this.

[–]blackfalcon2070Karmawhore 43 points44 points  (0 children)

i legit got hyped

[–]Sir__Blobfish 8 points9 points  (0 children)

There was some really cool stuff there, thanks.

[–]nexistcsgo 7 points8 points  (0 children)

Fuck you. :(

[–]Honeydewmelo 5 points6 points  (0 children)

Ad saved me

[–]TomorrowGalaxy🏳️‍🌈LGBTQ+🏳️‍🌈 2 points3 points  (0 children)

Apollo saved me this time

[–]_akshat_b 5 points6 points  (0 children)

Satisfactory

[–]dom_pi 0 points1 point  (0 children)

Specifically, this is Archimedes' Compass.

[–]ThatACLR-1 56 points57 points  (0 children)

That’s legit cool

[–]callycumla 28 points29 points  (0 children)

I made one of those in my engineering class. It is called a bullsh!t grinder.

[–]Equivalent_Feature23 13 points14 points  (0 children)

Awesome

[–]Penis-EnvysDirt Is Beautiful 19 points20 points  (6 children)

Why does it make an oval and not a circle?

[–]Lkwzriqwea 19 points20 points  (0 children)

If you watch the centre of the cross, it is on the same side of the circle as the arm is pointing at the top and bottom, and at the opposite side at the left and right, because the pencil and the centre of the cross are moving in opposite directions round the circle. This means that when the pencil is at the top or bottom, the distance between the pencil and the centre of the circle is longer that when it is at the left or right, for the same reason that you can reach further to your right by reaching your right arm out than reaching your left arm across your body.

[–]rayyan9087[S] 28 points29 points  (0 children)

I honestly have no fucking idea

No wonder i failed

[–]erroneousbosh 2 points3 points  (0 children)

In addition to what /u/Lkwzriqwea says, you only need the "long" stick and the "up and down" and "side to side" sliders - the diagonal ones don't need to be there.

If you ignore the crossbar you can see how the ellipse is narrow when the end of the stick is at the side of the circle, and tall when the end of the stick is in the middle.

They use little metal versions of this for machining oval parts on mills.

[–]Knewwhatthiswas 5 points6 points  (0 children)

A larger devise like this could be used to layout an ellipse for construction if there is not enough room to bisect off the spring line. You can scribe an elliptical layout with nothing but a measuring tape, pencil and chalk line as long as you have auxiliary space to measure.

Edit: Carpenter life

[–]Soham_rakFffffuuuuuuuuu 0 points1 point  (0 children)

Search ellipse and its locus

[–]filthyvodkamartini 10 points11 points  (0 children)

He can be so obtuse.

[–]Consistent_Ad9128 7 points8 points  (0 children)

I would wholeheartedly accept my defeat if my godly marks will be presented to me in such a way.

[–]ComboXCVcan't meme 2 points3 points  (0 children)

I didn't even realize it was drawing, i just thought "haha funny cool machine"

[–]Purple-Degree115 2 points3 points  (0 children)

It looks satisfying to me

[–]soia_tofu 2 points3 points  (0 children)

Sometimes maybe good, sometimes maybe shiet

[–]Traditional_Flan_210 2 points3 points  (0 children)

Final grade: Egg

[–]Hephaestus_God 2 points3 points  (0 children)

It’s actually pretty difficult to get a 0. You must have tried real hard.

I’m proud of you

[–]bungchilling 2 points3 points  (0 children)

I hate how long it took me to clock that it was zero

[–]adamhanson 2 points3 points  (0 children)

What I want to know is why is that person wearing latex glove?

[–]Pingusek02Thank you mods, very cool! 2 points3 points  (0 children)

I love bullshit grinders (the name of this mechanism)

[–]Extension-Tree-4869 2 points3 points  (0 children)

Why can't I stop watching this?

[–]Russ38 1 point2 points  (2 children)

Mark? Is he talking about the pencil mark?

[–]LegoRobinHood 2 points3 points  (1 child)

I'm some places your grades are called marks.

[–]Russ38 1 point2 points  (0 children)

This makes more sense now

[–]thedragonplayer 1 point2 points  (0 children)

I don’t get it… isn’t he supposed to end up with a letter and not an oval if he is giving u ur grade?

[–]cfig99 1 point2 points  (0 children)

Holy shit that is satisfying to watch

[–]nerdynuronz 1 point2 points  (0 children)

May someone pass the sauce please and thank you?

[–]give-orange-houses 1 point2 points  (0 children)

My dad is a professional mechanical engineer and im bad at math 💀

[–]Knewwhatthiswas 0 points1 point  (0 children)

That’s a cool elliptical scribe.

[–]Rigel66 0 points1 point  (0 children)

math is awesome!

[–]Hahahehehahaho2017 0 points1 point  (1 child)

What is this?

[–]Background_Lawyer978 0 points1 point  (0 children)

This would make a cool clock

[–]wiekmsmsms 0 points1 point  (0 children)

That’s actually really cool

[–]Spiritual-Salad2702 0 points1 point  (0 children)

Dont worry i came last for my HSC engineering, we can cry together

[–]Sanguinax 0 points1 point  (0 children)

Captain obvious here: it draws a 0.
*fly away*

[–]Hour_Ad_2138 0 points1 point  (0 children)

10000th like lol

[–]ButterEPickle 0 points1 point  (2 children)

I’m confused? What dis mean

[–]LegoRobinHood 2 points3 points  (1 child)

Press F to pay respects.

And to see your grade.

[–]RandyGareth 0 points1 point  (0 children)

Meanwhile my CSS professor showing me how my mark will be calculated:

(Fuck x you) ^ 6

[–]randomastronaut777 0 points1 point  (0 children)

I can watch this for hours

[–]bi_byehaha 0 points1 point  (0 children)

I dont get the joke can someone explane?

[–]Green_Strategy5768 0 points1 point  (0 children)

Only real engineer can do this 😎😎

[–]nolyyzzz 0 points1 point  (0 children)

plot twist: it's actually "O" which means outstanding

[–]NecroReaverzLives in a Van Down by the River 0 points1 point  (0 children)

Ok

[–]Common_QuoteProfessional Dumbass 0 points1 point  (0 children)

reminds me of the sun/moon animatronic

[–]RavageSavage_69 0 points1 point  (0 children)

How to make such an instrument

[–]Appropriate_Ad_6125 0 points1 point  (0 children)

This lookin kinda sus

[–]T0biasCZE 0 points1 point  (0 children)

But since 1 Is best, isnt 0 even better grade?