top 200 commentsshow 500

[–]zens167 3933 points3934 points  (33 children)

Looks like the Surface Book hinge

[–]Psycho_Snail 2114 points2115 points  (14 children)

Turn your laptop into a surface pro with this one simple trick!

[–]christ0pherz 62 points63 points  (9 children)

Maybe that's where they got the idea

[–]hmasing 35 points36 points  (1 child)

Considering how often it's reposted... probably.

[–]Criterion515 9 points10 points  (6 children)

If by "they" you mean MS in the design of the hinge, that could be. I'm pretty sure ancient woodworkers that used this technique long ago would have never seen a Surface Book hinge. :)

[–]whiteknives 27 points28 points  (1 child)

I’ve had my Book for over a year and the hinge still infatuates me. Moving it back and forth is the visual equivalent of popping bubble wrap.

[–]wittywalrus1 13 points14 points  (0 children)

First thing it reminded me of, too.

[–]mossberbb 1083 points1084 points  (108 children)

why the vertical cuts?

[–]wandering-monster 1587 points1588 points  (91 children)

They will glue a bunch of inserts into those. When they're dry, they'll sand the protruding bits flat. Then the curve will stay curved.

[–]Emerald_Triangle 349 points350 points  (64 children)

They will glue a bunch of inserts


[–]strallweat 367 points368 points  (36 children)

I bought a box of those once, but left them in the rain.
Now they're all limp biscuits.

[–]zewplankton 122 points123 points  (11 children)

Sucks when stuff like that happens, but you just gotta keep rollin’ rollin’ rollin’ rollin’...

[–]Ghost_of_Trumps 70 points71 points  (10 children)


[–]knightfallzx2 84 points85 points  (9 children)


[–]gmdavestevens 68 points69 points  (7 children)

Come on.

[–]Jacob_Lahey 59 points60 points  (6 children)


[–]AgDrumma07 42 points43 points  (10 children)

This joke makes me want to break something tonight

[–]BuckarooBonsly 28 points29 points  (9 children)

It's just one of those days.

[–]ThriveBrewing 6 points7 points  (8 children)

You don’t wanna wake up

[–]BuckarooBonsly 6 points7 points  (7 children)

Everything is fucked

[–]Perm-suspended 4 points5 points  (6 children)

Everybody sucks.

[–]marteney1 5 points6 points  (5 children)

Don’t really know why!

[–]therantingsvede 10 points11 points  (3 children)

Since they're now limp they may fit into a wider variety of little nookies!

[–]MrMagius 2 points3 points  (0 children)

I did it all for the Marri, so you can take the Sugi, and stick it up yur asss

[–]mechapoitier 9 points10 points  (6 children)

They probably used the word "inserts" instead of biscuits because 99% of people who aren't woodworkers don't know what word means and they wanted people to understand what they were talking about instead of reading jargon.

[–]Oak987 108 points109 points  (3 children)

They will insert wedges for rigidity.

[–]TheBoneOwl 28 points29 points  (3 children)

Looks like the place you'd glue "wood biscuits" into to reinforce the joint, similar to how you'd use biscuits in other joinery techniques.

[–]UnpopularCrayon 12 points13 points  (0 children)

And similar to how you use KFC biscuits to permanently join the chicken to your intestines.

[–]Zs2k 3389 points3390 points  (369 children)


This is very common in my trade, so if you have a piece of 1/2” ply your bending, I’d set my saw to an 1/8 maybe a little more depending on the bend, than cut in 1” dashes for roughly 6-8” depending on what your corner length is. We use this application for a lot of custom home building where radius builds are extremely common, it’s a fun and interesting take on carpentry I recommend trying some kerfing yourself

[–]alwayslurkeduntilnow 1092 points1093 points  (87 children)

Kerfing, bloody brilliant name for it.

I'm Not going to check so I do hope you are telling the truth.

[–]Snatch_Pastry 835 points836 points  (61 children)

The kerf of a saw blade is the width of the cut it makes.

[–]RuncibleSpoon18 237 points238 points  (52 children)

TIL, thanks for that little fact

[–]Jpvsr1 499 points500 points  (49 children)

Saw blade is its name because it is a blade that is used to saw

[–]turtlemix_69 329 points330 points  (19 children)

You can tell by the way it is

[–]InAFakeBritishAccent 143 points144 points  (11 children)


[–]Bringdpayne 12 points13 points  (1 child)

Something something Aspen tree.

[–]ratuna80 3 points4 points  (0 children)

Olly Olly Aspen tree

[–]FeloniousDrunk101 10 points11 points  (1 child)

People don’t think it be like it is, but it do.

[–]eab0036 46 points47 points  (2 children)

Saw is its name because it is seent.

[–]Spelaeus 23 points24 points  (0 children)

Blade is its name because you can use it to kill vampires that you seent.

[–]Animorganimate 21 points22 points  (5 children)

"I see", said the blind man to his deaf dog as he picked up his hammer and sawed.

[–]Jpvsr1 2 points3 points  (3 children)

I was pretty sure that he was just talking about his ICEE drink.

[–]Animorganimate 9 points10 points  (0 children)

"ICEE", said the blind man to his deaf dog as he watched the radio.

[–]RuncibleSpoon18 6 points7 points  (0 children)

Stop, I can only handle so much in one day

[–]theyellowpants 2 points3 points  (0 children)

I saw what you did there

[–]ImaginaryStop 2 points3 points  (2 children)

Nonsense! Next you'll tell me my table saw has that name because it's a table with a saw!

[–]Rmachine 11 points12 points  (0 children)

Always ad kurf to measurements for cutting material ( machinist here!)

[–]Mattyweaves19 21 points22 points  (4 children)

Not to be confused with kerfuffle.

[–]Copidosoma 27 points28 points  (3 children)

A kerfuffle is what you get when you kerf poorly.

[–]slopecarver 12 points13 points  (4 children)

not to be confused with an unrelated but similar thing, r/keming

[–]relic1882 9 points10 points  (3 children)

Have you kerfed today?

[–]ndcapital 4 points5 points  (0 children)

This sounds like a sex act involving shit that you'd look up on Urban Dictionary

[–]Dudeist-Priest 96 points97 points  (34 children)

How well does it hold up?

[–]NotAlwaysGifs 239 points240 points  (32 children)

This only shows part of the process. The kerfs will be filled with glue, and the perpendicular notches that run along the kerfs will get a spline similar to a little biscuit joint. Then you trim off the excess and sand the whole thing smooth. They're pretty tough once all the glue is set.

[–]4354324 103 points104 points  (10 children)

This gif was taken from a post made in /r/DIY that showed the whole process. Guy was making a coffee table that fit over his ottoman, IIRC. It was very interesting.

[–]NotAlwaysGifs 7 points8 points  (0 children)

It's made the rounds a few times on both subreddits. The full video is linked somewhere below too.

[–]Iam1ofmany 15 points16 points  (44 children)

Is this how they would do a Tear Drop Camping Trailer? I have always wondered how to get it to do that round shape.

[–]lexrc 60 points61 points  (11 children)

This is for a tight radius curve. Plywood is flexible enough to do the teardrop shape without kerfing. Moderate curves may require a bit of time in the steamer to soften the material, or just two layers of thin plywood.

Similarly, no kerfing is needed to make a skateboard kick tail (or a skateboard halfpipe.)

[–]kkocan72 11 points12 points  (7 children)

We did some custom trim for a job once a while ago that required us to build a steamer in our yard because of the size of the piece of trim and the shape it needed. If I recall, we used a large (20" diameter or so) piece of HDPE or some other heavy duty plastic pipe that was long enough to fit the piece plus the curve needed. We then capped both ends, created an elaborate system out of metal clamps to gradually pull the piece into shape and then would put it in the pipe, ran a steam generator into the pipe and over the course of a couple days would let it set, take it out, change the clamps and repeat.

[–]Dasbufort 6 points7 points  (2 children)

If you need to do this again, you can do it with just polyethelyne sheeting formed into a bag. Check out this video: https://www.youtube.com/watch?v=--iPQIwSEJM

[–]BoxOfSnoo 2 points3 points  (0 children)

Most of the time for skateboards they bend the layers as they make the ply, not after. The glue helps hold the shape.

[–]seamus_mc 4 points5 points  (3 children)

Or use unidirectional ply called wiggle wood

[–]mochapirate 8 points9 points  (2 children)

They can steam and utilize pressure and a mold.

[–]BumpNamedHarold 6 points7 points  (1 child)

I build RV’s for a living and this is NOT how they get that shape. Fiberglass trailers generally have aluminum frames which are obviously bent using a different method. The units that do happen to be wood underneath are built using curved sticks for support and 1/8” luan that curves to the shape. Then a thin fiberglass “skin” is fastened over top. No plywood. Some teardrops are built using 6 walls in the front and back to get the right radius.

Source: In charge over the “shelling” division of a Jayco plant and we build and install the walls

[–]Amithrius 37 points38 points  (32 children)

Does the outer layer crack over time?

[–]PahoojyMan 88 points89 points  (15 children)

Yes. Everything cracks over time.

[–]iSubnetDrunk 20 points21 points  (1 child)

I found the interrogator!

[–]Zilveari[🍰] 5 points6 points  (0 children)

Dammit Garak!

[–]discbeater 7 points8 points  (0 children)

Not black.

[–]SirDroop 9 points10 points  (3 children)

It does, but usually the application for this technique would be to bend a piece of nice plywood around a frame. As long as it is properly affixed it should stay stationary and have virtually no stress on the bend

[–]Yo_nerd 11 points12 points  (1 child)

This guy kerfs

[–]ChiefZedd 8 points9 points  (0 children)

It’s Kerf or kothing!

[–]McPurrs 22 points23 points  (19 children)

Why does it need the cross cuts?

[–]sgorneau 36 points37 points  (11 children)

My guess is biscuits for added strength

[–]btveron 25 points26 points  (8 children)

I thought you were being sarcastic until I saw someone else said biscuits as well. TIL biscuits is a woodworking term.

[–]UEMcGill 3 points4 points  (0 children)

Probably add some biscuits and a solid wood piece inside the radius to add stability.

[–]massacreman3000 21 points22 points  (4 children)

A lot of car audio subwoofer boxes make use of this for a nice smooth port

[–]HateCopyPastComments 8 points9 points  (15 children)

Doesn't it make the wood really weak? It is not only being bent but it has gaps in the weakest point?

[–]factbasedorGTFO 4 points5 points  (0 children)

Common in furniture manufacturing is to bend the several sheets that make up plywood in a jig, then laminate them together with glue.

One of the most popular food service table manufacturers is called Plymold.

[–]spaper 5 points6 points  (0 children)

Ah yes, I see you too are in the trade of fishing like me!

[–]Stinkyfisherman 3 points4 points  (5 children)

I've made a few subwoofer boxes with kerfed ports. They always looked amazing once finished.

[–]McWalkerson 5 points6 points  (1 child)

You can’t just tell everyone about your amazing kerfed ports and then not post pictures of them.

[–]j_e_10_15 2 points3 points  (0 children)

We do the same thing in aircraft interiors manufacturing with our honeycomb cores that we sandwich between fiberglass ply layups to make the curved surfaces on cabinets. I had no idea it could be used for plywood as well!

[–]67Mustang-Man 376 points377 points  (6 children)

[–]GeorgeRRZimmerman 41 points42 points  (0 children)

THANK YOU. I was hoping someone had written something like this.

[–]TheBestBigAl 8 points9 points  (2 children)

Second one doesn't seem to work for me (and also doesn't support metric as far as I can tell).

[–]Frptwenty 522 points523 points  (58 children)

[–]nobody_likes_soda 91 points92 points  (53 children)

[–]NotSpicyEnough 178 points179 points  (50 children)


EDIT: I see it's a real sub, so um NSFW

[–]cepxico 143 points144 points  (13 children)

Goddamnit idk what I was expecting lol

[–]Adrahelm 60 points61 points  (7 children)

The answer is penis'

[–]FeFiFoPinky 29 points30 points  (3 children)

Dead penis, don't eat.

[–]TDarkShadow 26 points27 points  (2 children)

Dead don't, penis eat?

[–]Dahnhilla 24 points25 points  (1 child)

Dead penis, don't inside.

[–]Whulum 2 points3 points  (0 children)

So meta

[–]Wolframite33 6 points7 points  (0 children)

Peni is the preferred plural

[–]BLACKJACK766 3 points4 points  (0 children)

Saw this comment and thought “oh yeah? We’ll see about that” and I don’t think I’ve seen such a closeup of dick before.

[–]Hairyballhider 28 points29 points  (4 children)

I read this then clicked it anyway. The first image filled my screen. That's the closest I have ever seen another one.

[–]fluxtimesthree 13 points14 points  (0 children)

I know right. Fuck why did I do that

[–]kator_c4og 25 points26 points  (18 children)

A genuine thank you from me, so hard to find dick pics these days

Edit: a word cos I'm daytime wine drunk

[–]cnibbana 5 points6 points  (0 children)

It’s like the sun!

[–]Jamesifer 12 points13 points  (0 children)


[–]happyinparaguay 7 points8 points  (4 children)

well thats a lot of penises

[–]sammypants123 6 points7 points  (3 children)

A forest of dicks.

Well at least we know where to go if we ever need a lot of photos of stiffies,

[–]portajohnjackoff 286 points287 points  (12 children)

I guess you can say it's plyable

[–]mal_wash_jayne 69 points70 points  (0 children)

Get out.

[–]SP4RK4RT 22 points23 points  (5 children)

Puns? Trees, wood you please leaf!

[–]GovtCheese1 20 points21 points  (3 children)

Xylem??? Damn near killed him!!!

[–]Crooked_Cricket 6 points7 points  (0 children)

Can you explain this to me? I'm stumped.

[–]O-hmmm 123 points124 points  (31 children)

It would cost me a fortune in plywood before this ever worked for me.

[–]mfinn 52 points53 points  (15 children)

As long as you can properly set the depth of your cut, it's basically idiot-proof to replicate what the .gif is doing. If you're talking different curves and angles, it gets slightly more complicated. It wouldn't surprise me if there are directions for common sheet ply and most common curves on the internet, so it's just cut and paste (literally and figuratively)

[–]raspwar 36 points37 points  (9 children)

I’ll try it, but will have to do some practice pieces on plywood scraps first. I could definitely un-idiot- proof it

[–]ParityClarity 26 points27 points  (7 children)

It's not idiot proof at all.

Sure if you have the tools and knowledge how to use them it should be fine.

When you try to free hand 5 20 inch parallel cuts with a circular saw you will start down an expensive rabbit hole of correct tools.

[–]Cha-Le-Gai 36 points37 points  (1 child)

The only people who say "idiot proof" are people who seriously underestimate idiots.

[–]Rbot18 14 points15 points  (0 children)


Or... Underestimate their ingenuity, I believe is the quote.

[–]kickopotomus 7 points8 points  (0 children)

If there isn’t some sort of wood working/crafts instructional site called “cut and paste” I would be both surprised and disappointed.

[–]AndBeingSelfReliant 5 points6 points  (3 children)

if you don't keep your lines parallel it could get messed up. As long as you have a table saw with enough space between blade and fence it should be pretty idiot proof. But if you do it by hand all with a circular saw it would take more skill.

[–]DudeBroChill 13 points14 points  (6 children)

I think you are either overestimating the difficulty or underestimating yourself.

[–]lexrc 5 points6 points  (0 children)

I think you're overestimating people. They make kindergarten scissors for a reason, and it's not just kindergarteners.

[–]djh650 27 points28 points  (2 children)

When I was younger for skate & bike ramps, we would soak the wood in water and just bend it.

[–]fastdbs 3 points4 points  (1 child)

For large radius bends that's possible. This is a really tight bend for water or even steam.

[–]SapphireSamurai 85 points86 points  (5 children)

I don’t remember this part of Aang’s training.

[–]Anemonean 48 points49 points  (0 children)

Everything changed when the 1/2inch-fir-veneer-plywood kingdom attacked

[–]R221B 8 points9 points  (0 children)

this could be korra.

[–]richmondsir 54 points55 points  (5 children)

MS Surface hinge reverse engineered.

[–]Criterion515 14 points15 points  (4 children)

Possibly the inspiration for the engineeringhttps://www.reddit.com/design of the Surface hinge, since this has been a technique used in woodworking since ancient times.

[–]winkelschleifer 10 points11 points  (2 children)

cutting edge technology here folks ...

[–]cosgyp 34 points35 points  (0 children)

You could just leave it leaning on a wall and hope it doesn't bend.

spoiler: it will

[–][deleted] 9 points10 points  (3 children)



[–]Ultimatex 3 points4 points  (0 children)

How dumb does u/GallowBoob think we are?

[–]B_B_Rodriguez2716057 3 points4 points  (0 children)

And with 2 million post karma in 10 months. Jesus.

[–]Piccolito 18 points19 points  (1 child)

The Last Plywood Bender

[–]dabigchina 6 points7 points  (0 children)

Then, everything changed when the saw nation attacked.

[–]Iprobablyjustlied 7 points8 points  (0 children)

How durable is it though

[–]mondayscarcheregsonc 6 points7 points  (0 children)

Water bending, fire bending, earth bending, air bending and now plywood bending. Whats next?

[–]societcities45 6 points7 points  (0 children)

Dab some glue on there and put a backing sheet, and I bet it would be pretty strong.

[–]manbruhwhysweatme 6 points7 points  (0 children)

Hello u/gallowplaceholder it is nice to see you on my front page again. How are you doing today

[–]p1um5mu991er 4 points5 points  (0 children)

Put your finger in there

[–]ELI7E 3 points4 points  (0 children)

I've kerf'd many trannys in my skateboarding/bmx days.

[–]Pooter_McGee 4 points5 points  (4 children)

How strong is the wood once it's bent like that?

Or does it become stronger when they fill in the cuts?

[–]SirDroop 4 points5 points  (0 children)

It almost never stands alone on its own as it is quite fragile after the kerfing. It is meant to bend around a rigid frame to create some type of cabinet or desk. My favorite example is a tellers station at a bank as they often curve around at the end...

[–]ArMcK 2 points3 points  (1 child)

It's filled with glue and a wooden biscuit is glued into the vertical cuts, then sanded flush. It's as strong as uncut plywood, perhaps stronger since it's an arch.

[–]theprodigychild 3 points4 points  (0 children)

I’m in a stall in a public bathroom and when I saw this out loud I said “oh look at that!”. Needless to say I’m going to get some weird looks when i go wash my hands.

[–]fart_fig_newton 9 points10 points  (21 children)

How is something like this calculated?

[–]Snatch_Pastry 24 points25 points  (6 children)

Well, the depth and width of the cut give you the legs and base of a triangle. A little trigonometry will give you the exact measurement in degrees of the acute angle at the top of the triangle. So if you want to bend the board 90°, you decide how many cuts to make, let's say 6, divide that into 90° to get 15°, and now you have a target for the acute angle on an isosceles triangle.

[–]fart_fig_newton 9 points10 points  (4 children)

Okay, so how does that tell you how deep to cut, how many cuts, or how far to space them? What about the width of the cuts themselves (1/8" kerf cuts vs. something wider)?

[–]LookingForMod 6 points7 points  (2 children)

The isosceles triangle is the hole of the cut after it's bent together. In his example, you should have 6 triangles with 15 degree acute angles on each of them. So the depth of the cut is the 2 long sides of the triangle and the width of the cut is the short bottom side of the triangle. Easily understood after the guy above explained it but would never have figured it out on my own.

[–]Phoneprincess 2 points3 points  (9 children)

I really want to try this now.

I suppose there was quite a bit of experimenting before they got it right. I wonder if the next step would be to fill the cuts with wood glue to keep the bend it it.

[–]fart_fig_newton 4 points5 points  (6 children)

I have some scrap plywood, may give it a go. I imagine it's a combination of cut depth, the number of relief cuts, and spacing.

[–]Pandatotheface 7 points8 points  (8 children)

What's the purpose of the vertical cuts?

[–]torcsandantlers 13 points14 points  (6 children)

They're probably for inserting another piece of wood to give the curve some more rigidity

[–]texas1982 6 points7 points  (5 children)

Yep. They put splines in there for extra strength

[–]illusionofpower 2 points3 points  (0 children)

That gave me wood

[–]wrapayouknuckles 2 points3 points  (0 children)

If you like this, you should see steam bending. If you have a spare 15 minutes today this is a great video on the subject.

Making a Jarvi Bench

[–]ajag008 2 points3 points  (0 children)

And then... everything changed when the plywood nation attacked

[–]Ze000 2 points3 points  (0 children)

All I think about is that wodden snake that would always pinch me

[–]aparabola 2 points3 points  (0 children)

Carpentry 101. Should be more construction gifs. An idea.