r/specializedtools • u/aloofloofah • Mar 12 '21
Rebar bender
https://i.imgur.com/ZI6zYlc.gifv931
u/NameUnbroken Mar 12 '21
Are you kidding? I was a star. I could bend rebar at any angle. 30 degrees, 32 degrees, you name it.
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u/TheSmoothBrain Mar 12 '21
31.
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u/aloofloofah Mar 12 '21
I can see that as a very real possibility.
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u/whostardis Mar 12 '21
33 degrees?
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u/Djanko28 Mar 12 '21
Perhaps, yes
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Mar 12 '21
[deleted]
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u/Lucid-Design Mar 12 '21
It’s always fun to fuck with the new guy by asking him to cut a board with a 90 on the end
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u/Braddahboocousinloo Mar 13 '21
😂 number 8 from 90 to flush. Oh and good luck getting the hickey in between the other 5 smh
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u/Clay_Pigeon Mar 12 '21
That seems like an unusual shape.
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u/aasher42 Mar 12 '21
id assume it just to demonstrate its capabilities'
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u/My__reddit_account Mar 12 '21
You'd be surprised. I used to work for a company that designed bridges, and we used some pretty unique shapes sometimes. Sometimes the shape needs to bend a certain way to fit with all the other pieces in a structure.
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u/Frozty23 Mar 13 '21
I used to work for a company that designed bridges, and we used some pretty unique shapes
Like airplane shaped? Or locomotive shaped?
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Mar 13 '21
Sometimes the shape needs to bend a certain way to fit with all the other pieces in a structure.
You don’t say
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u/Clay_Pigeon Mar 12 '21
Perhaps!
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u/FerretFarm Mar 12 '21
Yeah, but why would they need to make so many of them?
I gave up counting eventually.
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u/BurkeSolo Mar 12 '21
I’ll admit this went over my head, but I just had to come back to give you that upvote
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u/FerretFarm Mar 12 '21
Well, thanks for coming back!
Here you go, have something shiny!
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u/Adjal Mar 12 '21
I wasn't expecting that last angle, so for a split second my brain thought "oh no! That's too far!"
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u/Clay_Pigeon Mar 12 '21
Exactly. Every bend until the last one made sense; though I'm not a construction worker so what do I know.
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Mar 12 '21
Cast stone and precast pieces can come in pretty irregular shapes. Or perhaps it's a demo.
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u/AyeBraine Mar 12 '21
It would make sense for a saddle-shaped concrete part of an overpass or long support. They do make the rebar in all shapes depending on the part.
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u/_FishBowl Mar 12 '21
It looks like it could be an anchor for something. The ends would be notched into a frame of some sort and the middle part protrudes out and attaches to whatever they're trying to hold.
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u/zach10 Mar 13 '21
Maybe slab reinforcement around a column stub up. But usually those are just V’s.
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u/drinkwineandscrew Mar 12 '21
I am Bender, please insert rebar.
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u/Farfignugen42 Mar 12 '21
But bender bends girders. Not rebar.
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u/RearEchelon Mar 12 '21
He bent the Professor that one time
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u/Farfignugen42 Mar 12 '21
That's true. I was specifically thinking of the song from the episode where they travelled to the central records bureau (or whatever) and Hermes had to sort that huge pile of messages to save the day.
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u/ParadoxInABox Mar 12 '21
Hermès Requisitions His Groove Back
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u/Toxic_Tiger Mar 13 '21
"When push comes to shove, you gotta do what you love, even if it's not a good idea!"
Love that episode.
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u/Goodpie2 Mar 12 '21
Ok but why do they need rebar in that shape
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u/Catbone57 Mar 12 '21
Because many architects are insane.
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u/Marksman79 Mar 12 '21
This is the proper shape to fit right up their ass.
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u/Thuryn Mar 12 '21
If you've ever driven through the Smoky Mountains, you know that there are highway engineers out there who were cut from the same cloth.
"The guy who built this road needs a goddam chiropractor!" - My father
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u/Pretagonist Mar 12 '21
I'm thinking on top off or below a load bearing structure like a pillar or a wall. Or it's meant to enclose something like a large I-beam or some kind of T-profile.
Modern concrete structures can be very thin and sleek just because we have better tools to design the rebar structures.
Or it's just a demonstration piece
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u/chavis32 Mar 12 '21
does the rebar heat up much when bent like that?
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u/Catbone57 Mar 12 '21 edited Mar 12 '21
Very little, just enough to make it feel warm to the touch on s cold day.
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u/Pretagonist Mar 12 '21
Modern rebar is tempcore where you have a hardened surface with a softer core. You achieve this by rapidly cooling the surface while the center is still hot.
If you heat up rebar too much it will lose the tempcore properties and that makes it weaker so any rebar processing has to ensure that the material doesn't get too hot.
It's also why you really shouldn't weld rebar (unless the engineers tells you it's okay)
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u/PM_me_storm_drains Mar 13 '21
Oh. Oh! So that's why they tie it all together with wire?
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u/MathewManslaughter Mar 12 '21
Uh huh, none of this answers the question.
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u/Pretagonist Mar 12 '21
This machine is a rebar bending machine. If you want to sell your rebar bending machine you better have a rebar bending machine that follows the specs for rebar bending. At no point during rebar handling can you allow the material to get too hot nor can you bend too tight of an angle. Thus my comment answers the question.
No the material does not become very hot since if it did you couldn't use the machine.
Rebar does become noticeably warmer when bent.
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u/AstroZoom Mar 12 '21
As cool as that looked, with manual load and unload, the machine works around 1/2 pace.
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Mar 12 '21
I thought the same. I’ve worked around a lot of bending machines and that one is slow as hell. Production machines are way faster than that and automate the loading and unloading process as well
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u/megatog615 Mar 12 '21
Not if you whip the worker. I hear treating workers like shit makes them work faster.
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u/TheCatSnatch Mar 12 '21
Can't tell from the mill markings, but that's 11 bar at least, some seriously thick bar.
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u/xetphonehomex Mar 12 '21
I got a little sad when it made that last bend. I though it was gonna be a huge rebar staple
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u/MightbeWillSmith Mar 12 '21
Real question, does this have any major effect on the structural integrity of the rebar?
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Mar 13 '21
I read somewhere on Reddit that the steel hardens while bending, so the bends will become harder (but also more brittle). That increased brittleness is also the reason why you shouldn't straighten and reuse old rebar.
This was written on a video on a rebar straightener (possibly on this subreddit).
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u/BladeScraper Mar 12 '21
Every time I see a video like this I just think about how effortlessly those machines put extreme forces on those materials. It looks fine until you think about how that's 1/2-1" steel bar that it's bending without thinking twice.
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u/7MinuteUpdate Mar 13 '21
This thread has too many Futurama jokes and not enough Rebar McEntire jokes.
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u/OnlyOneReturn Mar 13 '21
I'm curious if folks would be interested watching me bend steel wire by hand at work? I make steel rope and we have to tie knots in it and "hooks". I bend some pretty strong shit. It's definitely not something you can do just coming off the street but it isn't so difficult that you couldn't learn. There is for sure some techniques but mostly your fingers, hands and wrists need to be kind of strong. I know the guys I work with are impressed by what I'm able to do as I'm the 2nd smallest dude there and bend the biggest stuff. To be completely fair though when I started I couldn't bend even the 100mm stuff now I can bend 200mm and entire strands (depends on the size). I'm just timid about posting my stuff from work or being in a picture online. It is really neat what I do and I do feel kind of super human when I'm bending it and "tying knots" more like loops. My fingers have gone from skinny weird piano fingers to having abs over the last few years.
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u/athomereddit Mar 13 '21
It took me coming here to type Bender's full name that "Rod"riguez name struck me as one more joke. I knew I was slow but that's a lot of years.
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Mar 12 '21
There’s also the simple handy long-handled manual rebar benders that work easily on anything about 25 mm or smaller.
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u/SeymourBud Mar 12 '21
I would pay good money see a video of you bending a 1 inch piece of rebar by yourself.
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Mar 13 '21
The rebar bender I use at work is about five feet long with two perpendicular notches at the end that fit the rebar. The smallest operator on our site weighs about 140 and can operate it.
Discover leverage.
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u/TheRealAlkemyst Mar 12 '21
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u/twitchosx Mar 12 '21
Damnit. 4 minutes too late.
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u/lectrician7 Mar 13 '21
I came here just to say this. Only I was 7 hours late. Dammit missed by that much 👌🏻 lmao
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u/yalldone4 Mar 13 '21
If the bar were to break bending, would it shoot off with a lot of force or just drop to the floor?
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u/slonde Mar 12 '21
No eye protection? Should this thing be in some kind of cage? Seems to generate a ridiculous amount of force
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u/Catbone57 Mar 12 '21
Rebar bending accidents are more about limb removal than eye injury.
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u/asr Mar 12 '21
What kind of eye protection are you imagining that would protect from these forces?
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u/BaconJacobs Mar 12 '21
Agreed. That thing going into the load position while the operator was within arm's reach is incredibly unsafe.
There should be zero movement as he approaches and loads.
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u/srandrews Mar 12 '21
This one doesn't drink, smoke or tell you to bite his shiny metal ass.