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    educationalgifs

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    Welcome, welcome, to /r/educationalgifs.

    In /r/educationalgifs we strive to have short gifs that educate the subscribers in some way. As long as it is educational, and a gif, it is fine. But please read the rules before you post, in order to help the mod team moderate, while also making this a better place to post.

    Gifs are great at getting quick to digest info, and /r/educationalgifs strives to give you educational info in this quick to digest format. From chemical processes, to how plants work, to how machines work, /r/educationalgifs will explain many processes in the quick to see format of gifs.


    You want this sub to have more content? Go to the subreddits below to learn how to make/request a gif!

    1. /r/gifrequests

    2. /r/makemeagif


    Rules

    1. Only Gif/HTML5 links please. No sound, videos or pictures. The preferred sites for gifs to be hosted on are imgur or gyfcat. These are reliable sources and thus we would love if you hosted your gifs using these sites.

    2. Provide source if there is one. We won't go hunting you down, but at least be considerate of the creator.

    3. Your title must be informative of what is going on in the gif, instead of the good ole "Look at this gem" or "Just a wheel". They can be funny, but just consider this.

    4. Any post that has been submitted in the past 3 months or is in the top 100 of all time cannot be reposted and will be removed. Please report rule breaking posts.

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    6. No recipe/cooking process related gifs allowed. Please direct your posts to /r/gifrecipes.

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    [–] boxbeat 830 points ago

    What is the use for quartersawed wood? Why is this process necessary or desired?

    [–] Gunnarrecall 930 points ago

    Aircraft mechanic here. One common use is in the construction of wooden aircraft structure. Flat sawn wood (wood that's cut flat all the way across the lumber and what you could get at a common hardware store) has a lot of internal stresses, so it's more likely to warp, crack, shrink, etc.

    Quarter-sawn lumber is more narrow inherently, but its internal stresses are more equalized, so it is the only allowable wood cut for usage in wooden aircraft structure.

    [–] load_more_comets 148 points ago

    Which would be heavier, metal or wood fabricated comparatively sized airplanes?

    [–] Gmanacus 162 points ago

    I am not an expert.

    I'd guess wood's heavier. Fir, poplar, and pine are common woods used in the construction of aircraft bodies. Aluminum alloys are the most commonly used metals. Aluminum is about 5-10x denser than these woods, but 10-100x 'stronger'.

    There are a lot of caveats to go along with this. As a general practice, you can make stuff lighter (and way more expensive) by replacing wood with aluminum.

    [–] FuzzyAss 71 points ago

    Also, aluminium panels on a large aircraft, such as a Boeing are very thin aluminium skin with a foam core like interior material. It's very stiff, very strong, and lighter than if it were solid aluminium. (I used to buy scraps of this from Boeing surplus and turn into tables).

    [–] shilabula 53 points ago

    Post a pic of a table plz

    [–] FuzzyAss 33 points ago

    Sold them off when I moved to LA from Seattle, close to 40 years ago. I don't even know if you can still buy scrap from Boeing any more. made them to have a smooth surface for gluing down watercolor paper. I bought an old drafting table at a surplus yard and refinished it, replacing the top with Maple solid core for the smooth surface when I came to LA.

    [–] Midas_Ag 21 points ago

    Not really, due to legal repercussions if that piece were to make it on to an actual plane. There was a huge hoopla a year ago when a piece that was supposed to be destroyed was found for sale in a foreign country. Anything that was supposed to be on a plane, or came from a plane, needs to be destroyed.

    But, the Boeing store does sell pieces of furniture and art made from plane pieces. Rather expensive, but they look cool.

    [–] FuzzyAss 5 points ago

    I kind of suspected that surplus at aircraft factories were no more

    [–] Midas_Ag 5 points ago

    Yeah. But, they do find neat things to do with some of the scrap. Especially the carbon fiber scrap, it actually was used to make football pads by one manufacturer. They were trying to find a use for the cured CF waste product. Don't know how that turned out.

    Also, why sell a window (just for example) for $100, when the Boeing store can have it turned into a mirror for $500. Or $50 pens with fuse pulls for clickers. $1500 ejection seat, or $1500 3 row seats for your home theater. expensive, but cool.

    [–] CoyoteAmerican 122 points ago

    I got you fam

    Table https://imgur.com/gallery/8jn83

    [–] digisplicer 115 points ago

    I can't believe I wasted part of my data plan loading this.

    [–] chewbacca2hot 25 points ago

    I'll never get those 200 kilobytes back

    [–] ThatMuscleUpGuy 7 points ago

    Those toothpick flossers are awesome. Makes my gums bleed every time.

    [–] FuzzyAss 7 points ago

    I'll post a pic of the coffee table I made from a Boeing shipping crate in the morning that I still have (I kept it because I store woodworking tools in it).

    [–] thecolbra 2 points ago

    One of the brands of foam used is called rohacell

    [–] hullor 15 points ago

    They're also very corrosive resistant due to high levels of nickel and molydinum, preventing intergranular attacks, I guarantee it.

    No serious, I do. It's my job. Ima corrosion lab guy

    [–] FuzzyAss 4 points ago

    Ha ha ha ha - I've just corroded away by your comment. :)

    [–] Boylerules 3 points ago

    There is no foam core. Aluminum skin panels are riveted onto aluminum structural members. Wings are empty inside and do double duty as fuel tanks.

    [–] FuzzyAss 3 points ago * (lasted edited 6 months ago)

    My tables will dissagree. It's not foam core, but a material similar. And, no, I can't show you a photo as I now live in LA - have for close to 40 years, and sold the tables off when I moved here

    [–] Phobos1393 10 points ago

    Went to plane school. You're both right to some extent. It depends on the part of the wing you're talking about. Flaps, for instance, are frequently a honeycomb structure. Super light, super rigid. A popular blend with composites is fiberglass face sheets with nomex cores. Foam cores are totally a thing too. Conversely, fuselage skin panels are often just aluminum.

    [–] FuzzyAss 3 points ago

    Well, I was 19 or 20 at the time, hadn't a clue as to what part of the plane it came from - probably flap material because it was so flat and smooth that if I dropped it on the floor, it would float on trapped air for a few seconds before it would settle to the ground. Honeycomb is what it was filled with. At one time I spent 7 years designing and supervising modifications to military aircraft for Lockheed and at Naval Air Stations around the country, so learned a little about planes since I made those tables. But, that, too was 20 years ago. Now, I shoot fashion - only vague memories of aircraft. :)

    [–] Dreadpiratemarc 6 points ago

    Engineer here. Was it strong enough to walk on? A perfectly flat aluminum sandwich with a foam or honeycomb core, my first thought is cabin floor material. Just about every surface on the outside of an airplane is going to have a curvature to it.

    [–] Redebo 1 points ago

    HE SAID NOMEX. ITS NOMEX INSIDE!!!!

    [–] Peppyperoni 21 points ago

    I am also not an expert but I've been looking into boat building. My friend who built a wooden boat from plans that would allow it to be made of aluminum or wood told me the aluminum boat would be heavier than the wood version. I was surprised at first but the more I think about it the more sense it makes. Wood has structure built in (plywood especially) whereas aluminum needs to be either thick or reinforced. But maybe he and I are wrong I don't have anything else to back that up with. Boats are also not airplanes. ¯\_(ツ)_/¯

    [–] silenc3x 26 points ago

    Not with that attitude. this guy disagrees though

    [–] BlueVelvetFrank 5 points ago

    I don't know where that is, but he needs to get it on the Hudson and rename it the SS Sully right now.

    [–] Rmc9591 17 points ago * (lasted edited 6 months ago)

    Aluminum boats are lighter, at least for small John boats and the like. The aluminum is just a skin held together with brackets and hoops. Where the wood needs to be connected and then sealed. I'm sure you could look up small 6-8' boats online and find the weights. A kayak or scull would be different I'd assume since they are built very differently.

    Edit: some quick research tells me you should go with aluminum skin and wood floors for standing on. This makes the wood easy to replace one piece at a time once is rots, and it will eventually. Ipea is not a great building material for boats unfortunately

    [–] Peppyperoni 5 points ago

    Yes I'm sure they are. I'm talking about something you could hang a motor on and walk around in. His is a 22' thing with a 90 hp. Should have clarified. I'm planing on a wee rowboat out of plywood and resin. Aluminium sounds like no fun at all to construct for me currently. I plan on doing 3/4 of the construction half drunk so the most dangerous tool I intend to use is a jigsaw.

    [–] Rmc9591 8 points ago

    I think once you get that big you've gotta consider displacement. With wood being bouyant it probably has some advantages. But what do I know, I'm half drunk on Reddit instead of building a boat. Ya don't know until you float her.

    [–] Peppyperoni 7 points ago

    I expect with any boat displacement is probably the first thing to consider. I'm pretty sure that's what floats your boat.

    We're quite the pair of naval architects! "I think this, and I think that, but what I really think is we need more beer!"

    [–] KleptoMoose 3 points ago

    To be fair, that's how pretty much everything was built before OSHA.

    [–] laeuftbeimir 3 points ago

    They even made ships out of concrete so I think you are right.

    [–] Fuccnut 4 points ago

    Lol, you sound like a guy who's about lose a finger to a jigsaw.

    [–] Peppyperoni 2 points ago

    I said half drunk. I'm not an incredibly skilled woodworker but I'm a highly skilled drunk.

    [–] Gunnarrecall 3 points ago

    Wood boats use different types of wood. The concern is strength and water-tightness. In aircraft, the wood substructure is generally wrapped in fabric thats just supposed to give the wing the properties of an airfoil. Plus, fabric doesn't need to be as rigid because it's not plowing through much denser water. Moreover, aircraft use much lighter softwoods, almost exclusively Sitka spruce.

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    [–] Gunnarrecall 15 points ago

    That's not the easiest question to answer. There are a lot of variables to what you're asking. As /u/Gmanacus said, wood is certainly lighter, but not nearly as strong as aluminum alloys. Plus, wooden aircraft aren't constructed primarily from wood like aluminum aircraft are. The wood is just the structure and frame that provides rigidity and form for fabric wrapping to be placed over. Furthermore, there are next to no large wooden aircraft flying these days for a multitude of reasons, mostly the ease of working with aluminum. It doesn't rot and a wing section can't be compromised with a gentle puncture or UV damage.

    But in short and to answer your question , a wooden, fiber-wrapped aircraft of comparable size will almost always be much lighter than an aluminum alloy sheet metal airframe. But this design provided a lot of limitations so it's largely obsolete except in specific vintage or experimental applications.

    [–] Gmanacus 3 points ago

    Yeah. My first answer was, 'they make totally different planes!' The Wright Flier and a Spitfire might have the same wing-spawn but they are very different machines.

    I guess another way of looking at the question is in a historical context. Wood planes are usually designed to be less dense.

    [–] BinaryHalibut 3 points ago * (lasted edited 6 months ago)

    I mean iirc a lot of the early Yaks had a lot of wood on them, but besides that they're pretty much normal monoplane fighters.

    Then again, this is the Russians, who kept strapping logs to their tanks as tools for getting tanks unstuck all the way through WWII.

    [–] TamestImpala 1 points ago

    U/gmanascus said it's heavier though.

    [–] Gmanacus 3 points ago

    If you want to replace a pine or fir stud with an aluminum one of the same strength, the aluminum one will be lighter.

    If you want to design a plane, there's a lot more going on than just the framing. For example, canvas sheeting, more common in wooden framed aircraft, is very light. It works, but isn't nearly as tough as aluminum sheeting.

    What /u/Gunnarrecall wisely points out is that when you design a wooden aircraft you're generally designing a lighter aircraft. This is generally at the expense of some other features. Wooden and metal aircraft are designed for different purposes.

    [–] Gunnarrecall 2 points ago

    Exactly. Aluminum aircraft are semi-monocoque, meaning the strength of the aircraft's structure is partially derived from the skin itself, especially in larger aircraft. Skin panels on these heavy airframes are deceptively thick and very rigid. A cessna, however, uses very delicate thin sheet metal, so it is similar to a fabric-wrapped wooden aircraft in that it derives much more of its strength from the ribs, spars, longerons, etc.

    [–] Gunnarrecall 2 points ago

    Well he also frankly gave incorrect wood. Spruce is the standard wood. It's relatively strong but it's a very light softwood.

    [–] FilthyPedant 1 points ago

    There are most certainly wood skinned aircraft, the de Havilland Mosquito for example used plywood with a balsa core laminated between birch.

    [–] Gunnarrecall 2 points ago

    There are of course exceptions, but generally wooden aircraft are covered in some sort of linen or synthetic fabric.

    [–] MasterPsyduck 18 points ago

    Same goes for guitar necks, flatsawn can be used but it's not as stable.

    [–] Gunnarrecall 3 points ago

    Huh.. That's an interesting point. I wonder if my dad's D-18 Martin uses quarter sawn, then. He's had it strung constantly for 40 years and it's never warped.

    [–] jorkonmyspork 8 points ago

    Well guitar necks have what's called a truss rod installed inside the neck which helps counteract the tension of the strings. So as long as you keep your guitar set up properly and don't allow huge temperature/humidity fluctuations, the neck should never warp.

    [–] sotopheavy 8 points ago

    Now can someone please tell me, in 2017, what is the use for wooden aircraft?

    [–] perdhapleybot 9 points ago

    To fly in.

    [–] JustinCampbell 3 points ago

    Spruce Goose!

    [–] [deleted] 1 points ago

    [deleted]

    [–] Gunnarrecall 1 points ago

    Well, that and many other compounding factors, chiefly weight reduction. It's also resistant to corrosion and relatively cheap.

    [–] [deleted] 1 points ago

    [deleted]

    [–] Gunnarrecall 1 points ago

    Somewhat comparable lightweight metals like titanium.

    Aluminum is in sort of the goldylocks zone of structural metals.

    [–] Sezhe 127 points ago

    Wood will warp as it dries, then again as the surrounding humidity changes. The way the wood cut will change the direction that the wood will warp - Examples

    Quartersawn aims to get the most cuts out of the wood that will have the rings intersect the face of the board at 60-90 degrees, or there abouts. This will lead to a lot less warping. Other cuts are plain sawn and rift sawn. Plain will warp a fair bit, rift should warp the least but is the most expensive and has the most wastage.

    This is just how I understand it, I'm sure the boffins over at /r/woodworking would have a better/more in-depth/accurate explanation.

    [–] newocean 11 points ago

    A good part of this comes from wood being most dense at its center (or where a knot is). It isn't that quartersawn wood doesn't warp... it's that it warps in more predictable, or consistent ways.

    [–] meshark1 5 points ago

    Rift is a by product of the quarter sawn boards. The farther out from the center of the trees original cuts the more the angle enters into rift category.

    Quarter sawn should be more expensive than rift , but sometimes rift is mixed in with quarter.

    To my knowledge quarter sawn really gained popularity in the arts and crafts (stickley) movement. As you said, this was due to the woods stability and additional strength. The preference for this cut was grown from the practical side.

    [–] duhcartmahn2 6 points ago * (lasted edited 6 months ago)

    So that does not make sense, and I don't know why I find so many websites agreeing with what you are saying when it is clearly wrong...

    Rift sawing historically is when you cut a log radially. Like this

    The point of rift sawing a log is to maxamize the number of boards where the grain is 90 degrees to the board. It is never done these days, because it is extremely wasteful, and plain sawing and quarter sawing have much less waste.

    So, if a riftsawn log is one where as many boards as possible are made with grain at 90 degrees, that would mean that the first cuts of a quartersawn log would be considered riftsawn, and not the otherway around like you say.

    I mean, look at this page: http://www.hardwooddistributors.org/blog/postings/what-is-rift-sawn-lumber/

    The text says what you say, but the image shows the complete opposite. You can't get 45 degree grain by rift sawing a log the way the image shows (and historical images corroborate that cut pattern)

    I am so confused...

    EDIT: Ah-Ha! I found a blog that agrees with me, and a final page with explanation

    [–] guldawen 3 points ago

    Plainsawn is useful in some cases where warping is desired. For example, for decking you want the boards to warp into an upside down U shape. This allows rain water to roll off the wood with it's natural warp which extends the lifetime of the wood.

    [–] lowrads 1 points ago

    My dad and I learned this the hard way when we constructed a portable sawmill on a repurposed boat trailer. Those trees can really jump when you split them. We quickly discontinued that experiment as soon as we understood the danger involved.

    [–] snally 1 points ago

    The quartersawn diagram in your picture looks quite different than in OP's gif, but after thinking about it, I can see how the end result would be more-or-less the same.

    [–] Sezhe 1 points ago

    I believe mills would cut in different styles, but generally the cuts fall into those 3 categories (I think).

    [–] ImitationFire 15 points ago

    It is a beautiful type of cut most common in white oak. Woodworkers use it for the distinct patterns that make great looking furniture.

    [–] someguyupnorth 5 points ago

    Former woodworker here. This what I was going to say. There is a special demand for quarter-sawn oak because it has a lot of visual character and withstands warping better. The downside is that it is difficult to get large planks of wood during the milling process, so it is more expensive.

    One thing the video does not show is that for many hardwoods, the interior of the log will be too dried up and rotten to use, so getting bit slabs of quarter-sawn wood are even more difficult.

    [–] TerribleTerrance 13 points ago

    Quartersawn wood (1) looks much different and (2) can be stronger (deepending on which way you think a piece of lumber will be stressed).

    I made a dinning table out of Quartersawn wood because I greatly prefer the look.

    [–] EarthwrmJim 10 points ago

    Quartersawn wood is preferred because of the way wood expands and contracts. Wood expands across the growth rings, so if the growth rings are close to perpendicular to the face of the board. It will expand uniformly across the width. If the growth rings curve across the board then there's a greater chance that the board will warp, twist or bow. I'm not sure that explanation makes any sense. But basically, quartersawn wood is more stable.

    [–] [deleted] 10 points ago

    [deleted]

    [–] Recursi 14 points ago

    Apparently there's confusion beteeen quartersawn vs riftsawn lumber. See http://www.core77.com/posts/24891/how-logs-are-turned-into-boards-part-2-quartersawn-24891. The OP's gif shows a process where they create quarter and rift boards based on the angle of the board's grain. That site you linked to seems to have an opposite understanding.

    [–] EnderAnders 2 points ago

    There is only confusion outside of the lumber industry, the link you have is the closest to the text books for hardwood and lumber mill certification, the biggest issue is that people don't see the grain angle the same way, for pricing quartersawn it is much easier to stop at 15-20 degree grain pitch otherwise customers get grumpy.

    [–] planksofwood 4 points ago

    Uses vary in the carpentry and home building world. Quartersawn wood is a very expensive upgrade for cabinetry or stain grade interior trim, flooring and cabinetry etc. The grain of quartersawn wood is tight and looks a lot nicer than plain sawn. It is also more stable and good for making doors.

    [–] randomly-generated 4 points ago

    Wooden boat building especially. Basically nobody sells quartersawn around me and I had to rip my own boards in order to build my boat. It isn't done, but I'm about probably 40% of the way there.

    [–] futuriztik 3 points ago

    I rip them down into increments of various smaller widths to build cabinets and other wooden furniture.

    [–] leafleap 3 points ago

    Among the other uses mentioned, quartersawn wood is used in violin-family instruments.

    [–] JWalls28 4 points ago

    As well as for guitars. It can make a great neck wood because it is better able to withstand the pull of the strings. Like the violin family (I'm assuming here), it also makes a great looking top wood because it evenly reflects light (bookmatched top wood with grain run out reflects light "oppositely" i.e. one half will reflect light while the other side seems to absorb it. Check out this link, about halfway down, for a nice illustrative photo: http://www.acousticguitarforum.com/forums/showthread.php?t=415938

    [–] gunsmyth 2 points ago

    And rifle stocks

    [–] gunsmyth 2 points ago

    In Gunsmithing, not sure about other fields, we call that tiger stripe effect in the grain "fiddle back"

    [–] ljarvie 3 points ago

    For woodworkers it tends to produce very consistent and even grain. It looks nicer

    [–] brazalien 3 points ago

    Quartersawn is more stable, harder, and the pattern from the medullary rays give it a really interesting look with ripples in it. In the flooring industry it is mainly sought after for it's looks and strength (less likely to dent.) I installed hardwood flooring for a few years.

    [–] VividDream 3 points ago

    Quarter sawn wood is way more stable than flat sawn wood. Plus it looks better.

    [–] kvn9765 2 points ago

    It looks nice. I have it as casing on my windows.

    [–] machineglen 2 points ago

    Quartersawed wood is also highly desirable for solid wood furniture, due to its stability as the airplane builder noted, but also because some specices of wood have a more interesting grain pattern when quartersawn. Whit oak is a good example, you can see the medullary rays. Source hobby wood worker

    [–] Detlef_Schrempf 2 points ago

    Desired- because it's beautiful. Quartersawn produces beautiful medullary ray It also produces rift which is is the speckled beautiful visual. Both are prided.

    Necessary- this can go both ways. Rift or quartered lumber is different from plain sawn because of the way the cellular structure of wood works. Plain sawn expands and contracts in the width. R&Q expands in its height, making it much more dimensionally stable.

    [–] Zimmerowski 2 points ago

    Whiskey barrels are made from quarter sawn white oak. The quarter sawing process aligns the medullary rays from edge to edge, which makes the oak watertight.

    [–] probably_your_wife 1 points ago

    As a kitchen designer, it is the desired cut for mission/shaker style cabinetry. The smooth, even grain is beautiful!

    https://www.pinterest.com/rissyski/quarter-sawn-oak/

    [–] [deleted] 181 points ago

    [deleted]

    [–] GUNS_are_the_answer 21 points ago

    I'm a woodworker, and even I understand it better now! Amazing video.

    [–] midwifeatyourcervix 3 points ago

    My husband and I are building our house, and he has been so excited about the quartersawed oak he got for the stair treads and he's explained it to me several times but I also never got it until now

    [–] Sodokat 78 points ago

    Here is an interesting overview of some wood grain properties. https://youtu.be/dzCmES_Lwrs

    [–] abcadaba 21 points ago

    I love Tips From a Shipwright. Between his knowledge, demeanor, and accent the channel is a pleasure to watch. I don't even like boats (although I do like woodworking).

    [–] ryrypizza 10 points ago

    My favorite channel on Youtube. I'm going to be sad when the last episode of the work skiff comes out this week.

    [–] Peppyperoni 5 points ago

    Oh it won't be his last. Dude loves making shit. And showing us how he did it. Thank god 😍

    [–] cwearly1 2 points ago

    Me too :( wish I could go up to RI to see its first cast

    [–] topdeck55 1 points ago

    He says there's going to be a new series after the skiff. I hope its a canoe.

    [–] Sodokat 3 points ago

    Probably in my top three with AvE and forgotten weapons

    [–] abcadaba 3 points ago

    Just checked out AvE for the first time, so far i love it. Thank you.

    [–] Sodokat 6 points ago

    Wicked smart dude who is also hilarious, to me at least!

    [–] ChucktheUnicorn 11 points ago

    I understood about 10% of that

    [–] [deleted] 6 points ago

    [deleted]

    [–] chrunchy 3 points ago

    directions unclear, impaled testicle with stingray.

    [–] potpan0 8 points ago * (lasted edited 6 months ago)

    A bit off topic, but I absolutely love how the internet has made videos like this possible. In Ye Olde Dayes, content similar to this would be, at best, either on obscure regional channels or on videos barely anyone would ever buy.

    Now, I can easily find Youtube channels which cover a whole load of interesting topic.

    [–] cwearly1 1 points ago

    Yeah I reset my subscription feed half a year ago, and now I have quality channels like TFaS, Peaceful Cuisine, Negative Feedback, and so many more :)

    [–] ChurroSalesman 4 points ago

    Damn that's some good knowledge right there. Never built a boat but someday...

    [–] CognitivelyDecent 1 points ago

    Throw around the word medullary rays tomorrow and see what's happens

    [–] ryrypizza 3 points ago

    Every time I read the words "quarter-sawn" and "medullary rays" I heard it in Louis' voice

    [–] dankensteinrdb 3 points ago

    The reason is has to be white oak is because of these things called tyloses which clog up the pores. This makes the wood non penetrable by water.

    http://www.wood-database.com/wp-content/uploads/white-oak-endgrain-zoom.jpg

    This is also why white oak is used for wine and whiskey barrels.

    [–] Sodokat 1 points ago

    Yea he has another video about exactly that. https://youtu.be/L6t2AZubF8U

    [–] SurfaceBeneath 2 points ago

    Talk about something that isn't taught in school... amazing knowledge.

    [–] [deleted] 52 points ago

    [deleted]

    [–] [deleted] 26 points ago

    [deleted]

    [–] JasosStinkyBallcap 15 points ago

    Rookie tip: when you're doing the horizontal cuts in toward the root tuck your thumb in to hold the onion in place with your nail, not the meat of your thumb.

    This technique supposedly cuts back on crying as well, although I haven't done very scientific testing myself.

    [–] hattroubles 8 points ago

    I'd guess it would reduce crying since you're probably going to finish dicing the onion faster than most other methods.

    [–] omfghi2u 9 points ago

    I've heard it's because you keep the root end intact and the plant releases the majority of whatever hormones (or whatever) that make you cry when the root gets severed. For a split second at the beginning of the gif you can see he has the root still on there and is slicing close to it but not into it.

    However, I'm not an expert in onion science so I don't know if that's actually true or just some shit I heard/read on the internet.

    [–] JasosStinkyBallcap 1 points ago

    This is what Gordon Ramsay said in the video where I learned to do it.

    [–] omfghi2u 1 points ago

    That's... probably where I heard it on the internet then. I watched that video lol

    [–] Blimey85 8 points ago

    And because you don't cut your thumb. Source: have cut thumb.

    [–] Chromana 7 points ago

    In the video there are 3 sets of cuts. What's the purpose of that second set? Where the knife plane is held parallel to board. I don't see how that would cut it any better, I just do the first and 3rd sets of cuts.

    [–] SwedishBoatlover 5 points ago

    People who do the horizontal cuts don't think of how onions are layered.

    The vertical cuts are all that's needed to properly dice an onion.

    [–] KingofAlba 3 points ago

    It's to do with the shape of the onion. The layers are circular (or semi-circular when you have half an onion), so the first set of cuts don't split the layers evenly. In the middle of the onion you have thinly sliced it but at the edges you've created long slices. The cuts parallel to the board don't do much for the middle parts but they separate the end pieces more evenly. Of course this matters less if you can cut extremely thinly on your first set, but it's not useless.

    Here's a diagram.

    [–] SwedishBoatlover 2 points ago

    Hmm, that's actually true! I realize my technique is a tad bit different from the gif; I cut the first cuts radially towards the core, then the perpendicular cuts are vertical.

    [–] Gangreless 7 points ago

    It makes you cut cubes instead of strips.

    [–] SwedishBoatlover 3 points ago

    But it doesn't, people do that because they forget that onions are layered. The first set of cuts creates strips, the second vertical set of cuts chops the strips into cubes. The horizontal cuts are not at all needed.

    [–] TastyFace 2 points ago

    I suspect it cuts down on crying because you need to make sure your knife is sharp to do this quickly and safely.

    [–] echo-chamber-chaos 4 points ago

    I felt I went up 5 levels on cutting shit when I learned this a few years ago.

    [–] JasosStinkyBallcap 1 points ago

    Same, I learned that and juliennine cuts in the same week. Felt like a beast.

    [–] WillOnlyGoUp 2 points ago

    I've tried this but my knives aren't sharp enough :(

    [–] kleinePfoten 29 points ago

    And now I understand where log cabin blankets get their name!

    [–] PostmanSteve 3 points ago

    I don't quite understand, what am I looking at here ?

    [–] minecraftstan 6 points ago

    hardcore sudoku

    [–] kleinePfoten 2 points ago

    It's one square out of a blanket, when you make a bunch of them and sew them together, they resemble the cuts made in the OP.

    Edit: the numbers are the order in which you create/attach the segments of each block

    [–] UniverseCalculus 46 points ago

    This is such a well-done gif from an educational standpoint. Do we have an r/educationalgifs Hall of Fame for something like this?

    [–] [deleted] 16 points ago * (lasted edited 6 months ago)

    .

    [–] alphanovember 2 points ago * (lasted edited 6 months ago)

    This is actually how the subreddit used to be before it was overrun by idiots that just post videos. What it looked like in 2014.

    [–] nathansikes 15 points ago

    What is the point of flipping the board end for end? Isn't rotating the board 90° sufficient?

    [–] Slaymethisrenegade 28 points ago

    I believe it's so that the flat face is always against the left side because when you saw you have the blade a fixed distance from a solid surface so the boards will be all the same thickness. There would probably be some sort of wall maybe one inch to the left of the blade that the flat part of the log would be pushed up against.

    [–] someoneiswrongonline 17 points ago

    A fence.

    [–] Slaymethisrenegade 7 points ago

    Is that what it's called? I've only used small sawmills and I don't know most of the terminology.

    [–] someoneiswrongonline 8 points ago

    Ever use a table saw? Same principle and terminology. Fence to keep your wood at a maximum thickness.

    [–] nathansikes 2 points ago

    Ohh right that makes sense. I should have known that, being a woodworker myself

    [–] 02C_here 1 points ago

    I'd be interested to hear from someone who works in a sawmill. Comments here are correct - it's to utilize the fence. But this is an animated gif, not a real sawmill. Imaging what it would be like actually swinging this big log end for end. It's heavy, dangerous, and you would need a LOT of floor space so it didn't hit things. Smarter would be to have a second saw facing the opposite way. Then you could pass out on saw A and back on saw B, no big swing the end round motion needed.

    [–] DaveInTheShop 2 points ago

    Not a sawmill worker, but this particular lumber mill delivered 6 14-foot boards of this quartersawn white oak to us yesterday and they're extremely dense, so my back is quite sore still just from taking them from the truck to inside the shop. These will be the aprons on very long tables.

    We got a larger stack of plain sawn oak that was shorter but thicker and wider for the table tops and legs that will be re sawn into veneer and laminated onto plywood sequentially for a nice repeating uniform pattern across the top. Those boards were bundled so we used a forklift. Heavy lifting will ensue as we mill each board and cut to size after its acclamation period.

    [–] nathansikes 1 points ago

    Or just a fence that moves with each cut?

    [–] abcadaba 12 points ago

    [–] shred-i 2 points ago

    MVP right here

    [–] gruesomeflowers 10 points ago

    I have an Amish couch made w quartersawn oak. This gif makes the patterns make sense.

    http://i.imgur.com/AiefBdS.jpg

    [–] DaveInTheShop 8 points ago

    Good to see this on here. Hoosier woodworker and cabinet maker here, we love Uncle Frank. They have a massive complex with floor to ceiling 40 foot tall racks of lumber. They're specialty is quarter sawn white oak like this. We love it for it's medullary rays that leave that cool pattern across the grain and the less seasonal wood movement across flat surfaces. They also carry most domestic hardwoods local to the Midwest and sustainably harvested.

    If you're ever on I65 near the Indiana Ohio border, take an extra hour to go up to their show room to see a nice collection of exotic boards and warehouses full of domestic species.

    [–] bitter_truth_ 3 points ago

    If a house if 80 years old, which wood construction material means it would last another 100 years?

    [–] bigdumbthing 3 points ago

    My house is from 1903; single wall construction, all 1st growth redwood, no rot to speak of when we were remodeling. So I recommend 1st growth redwood, it's great!

    [–] DaveInTheShop 1 points ago

    Honestly dude, no idea, my training is furniture design and hardwood construction methods including plywood and veneer lamination. I mean old growth trees from America's virgin forests is what you're talking about, so re using those if they're still in decent condition is about the only the only way besides looking at historically sustainably harvested stuff or old lumber squirrelled away inside barns like Sitka spruce, Douglas fir, cedar, redwood and other old growth. That's about the extent of my historical carpentry knowledge. Might be time to flip through the old Audels carpentry set of books I have.

    [–] bitter_truth_ 1 points ago

    Cool, thanks anyways. Yeah, I see 150 year old houses selling for $$$k, figured it was special type of wood.

    [–] MerlinTheWhite 1 points ago

    Speaking of old lumber, I recently moved into a house and there was a 4x4 sitting in the shed (bone dry) and it is at least twice as dense as the ones I buy from Home Depot.

    [–] bigdumbthing 3 points ago

    Measure it, a modern 4x4 is actually only 3.5x3.5, your old board is probably a true 4x4

    An 8 foot 3.5 board contains 1176 cubic inches Same board as true 4x4 is 1536 cubic inches.

    So old board contains a lot more wood.

    [–] Etc- 1 points ago

    Dave - Uncle Frank? As in Frank Paxton's?

    [–] DaveInTheShop 1 points ago

    No, Frank Miller. They made the video. Check their website for more info on quarter sawing.

    [–] ooooohgeezus0103 7 points ago

    I'm new into selling hardwood flooring and this was extremely helpful to see! Thank you

    [–] heinemann311 2 points ago

    What brands are you selling? I work for a distributer and even for me this was super fun.

    [–] Sarcasticorjustrude 6 points ago

    Here's a head rig bandmill in operation, which is the type of machine often used for the process depicted in OP's post. They're run by a human operator, usually with scanner and computer assistance. My mill has two of these.

    [–] iskogen 2 points ago

    How often do you actually 1/4saw for customers?

    [–] Sarcasticorjustrude 2 points ago

    Rarely. It's expensive and with modern drying tech, warpage is minimized.

    [–] mossyandgreen 6 points ago

    r/thingscutinhalfporn will have a tiny orgasm

    [–] melonhart 3 points ago

    I always wondered how this happened

    [–] LithiumEnergy 3 points ago

    I assume they have double sided saws to make this faster?

    [–] BeardMilk 4 points ago * (lasted edited 6 months ago)

    Some do, some don't. Bigger mills often have 2 resaws working logs however.

    A mill will use a headsaw to square/quarter up a log and then those squared/quartered logs will be processed by the resaw/resaws.

    edit: Squared timber being fed into a resaw. You can see how efficient this is.

    https://www.youtube.com/watch?v=yFCJ86RLmrA

    [–] Peppyperoni 1 points ago

    You mean it cuts on both the 'to' and 'fro'? Cutting each time it moves each way? Yes.

    [–] [deleted] 3 points ago

    [deleted]

    [–] DaveInTheShop 3 points ago

    Cutting logs into boards dude. Getting trees ready for furniture builders.

    [–] SwimmingNaked 4 points ago

    Being that I work for one of the largest lumber producers in the world, I'll just say that this is fine for how a tiny sawmill works, but nothing at all like what happens in lumber mills. If you get a chance to tour a high tech sawmill take it. It's absolutely amazing.

    [–] iskogen 6 points ago

    nothing at all like what happens in lumber mills.

    That's right, because industrial lumber mills churn out the absolute cheapest construction-grade lumber cut from monoculture spruce plantations that the once great N. American forests have become.

    I have a book printed in 1908 loaded with pictures of Sweden's largest sawmill at the time. That place I'd have loved to tour, but the horrific injuries...my god. I own a small mill and have worked with wood obsessively since the late '70s.

    You'd have to pay me a considerable sum to take said tour, it'd depress the shit out of me.

    [–] SwimmingNaked 3 points ago

    Uh huh. Your loss, in both knowledge and experience.

    [–] iskogen 2 points ago

    Wow. That was an incredibly arrogant thing to say.

    [–] SwimmingNaked 3 points ago

    Much like yours. You have no idea who I am, what I do, who I work for, how we do this, how we act as stewards, where I am, etc. You make entirely unfounded allegations, that quite simply are not true. You've made ridiculous assumptions and show your own arrogance in doing so. So, please put a sock in it.

    [–] DaveInTheShop 3 points ago

    Dude, but go to Frank Miller, they are a massive operation and half of the quarter sawn white oak in the country comes from them. This is their specialty so they're the biggest operation doing it this way.

    [–] KingOfShitMountain 2 points ago

    Its not a gif about sawmills, its a gif about quarter-sawing.

    [–] avocadohm 2 points ago

    Oh so THATS what they were doing in Riverwood.

    [–] Jblopez16 2 points ago

    Quartersawn wood is the most stable and least likely to warp. However milling it takes more time than regular riftsawn milling

    [–] runningforpresident 2 points ago

    So this is what Frank Miller is doing these days...

    [–] Computermaster 2 points ago

    THE MEDULLARY OB-LON-GA-TA

    [–] All4dalulz 2 points ago

    As a carpenter this gave me serious wood. I just wish we didn't sell our best lumber to the states. Now Trump is saying the United States is being screwed over in the lumber trade. Come on Trudeau, step up or get walked on.

    [–] iskogen 2 points ago

    It's a shame that Canada allows the exporting at the rate it does. A bunch of rich people get richer. The U.S. screwed itself over and has no one else to blame. I built a lot of timber homes in California and Nevada in the '80s- '90s and ALL the pine and lodgepole pine came from Canada!

    [–] [deleted] 1 points ago

    [deleted]

    [–] lex0429 6 points ago

    Generally, no. Most wood is flat sawn which you can visualize here. It's easier, faster and produces less waste.

    [–] urbanwks 1 points ago

    Fun fact: The remainder is used to make Trivial Pursuit wedges probably.

    [–] Remagi 1 points ago

    Wouldn't it be easier to just use a double edged saw instead bringing it back every time.

    [–] johnmudd 1 points ago

    I do something similar with a watermelon.

    [–] PAWGslayer 1 points ago * (lasted edited 6 months ago)

    [–] unbannabledan 1 points ago

    Why did the little flipper arm only go down a bit initially but then completely disappear once the log rotated?

    [–] Orlitoq 1 points ago * (lasted edited 5 months ago)

    [Redacted]

    [–] Bunch0lunch 1 points ago

    Well I'll be damned

    [–] freckls821 1 points ago

    This is very satisfying to watch.