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How To Make Pie Cut Bends
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On this episode of The Fab Forums I discuss some simple techniques on how to make pie cut bends. The process to do it right isn't very hard. With a little math you can make accurate and repeatable pie cut bends.
I hope you dig it
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@eric_ewek2134 4 жыл бұрын
I wrap a strip of paper around tubing, fold it in half, and mark where the fold is and where paper ends meet. Perfect halfway marks every single time. I’m not a mathmagician.
@C1P43 3 жыл бұрын
pi cut pipe angle grinder
@69hytek 7 жыл бұрын
A couple of methods I have used to mark centre lines on pipes and tube may help someone. 1. tools found in a combination square set make this job easy & accurate. Circle centre finder will give exactly 180 degree marks across the pipe. Then use the square to draw the lines. This requires a perfect cut to begin with though. 2. Say you have a 4" diameter pipe, on a flat surface pack under a sharpie so the tip is at 2". Steady hand, drag and draw :) Great vid by the way!
@Thefabforums 7 жыл бұрын
truth
@xrookie650 7 жыл бұрын
After you mark the opposite sides of your tube, you can mark the half diameter tube dimension on the bed of your saw off the back stop. Then you can just line up the mark on the tube on the mark on your saw bed and make the cut. Then roll the tube 180 degrees and cut the other side. That way the saw angle never changes and all you have to do is roll the tube back and forth to make the cuts. If that makes any sense.
@FrankA-973 6 жыл бұрын
Garage Dad awesome tip!!! 👍🏼
@joeybratten 6 жыл бұрын
I was gonna ask for a tip on how to cut them! Thanks
@jasonstuck7080 3 жыл бұрын
Thats how I figured he was gonna say to do it
@R5GTT 10 ай бұрын
Saw that in another video 👍🏽
@team8th 4 жыл бұрын
90/number of pipes/sections then divide it by 2. Eg: if u want 5 sections. 90/5/2=9deg (angle ur pipe to 9deg for the first cut). Then rotate make the second cut. Ur first cut will be 9deg. Ur 2nd, 3rd and 4th will be 18deg as there are 2 sides) Only the first and the last pipe will be 9deg. (Deemed as 1 pipe) so in total there will be 6 pieces) 4 x 18deg and 2x 9deg Once u add all those pipes it will sum up to 90deg
@callmenortnortin467 7 жыл бұрын
Cut a piece of template paper exactly the dia.of your pipe.(make it as something that wraps AROUND your pipe as in a "wrap around)Size doesn't matter!,Fold it in half .the joint will be one side of your pipe and the fold mark will be the exact opposite side. No math required. Fold your paper strip twice evenly and you can mark your pipe in quarters.
@Thefabforums 7 жыл бұрын
not a bad idea
@Turbogto_guy 6 жыл бұрын
Very good idea. Thx!
@andrewwilson8317 7 жыл бұрын
Another advantage of pie cutting tubes is you can dress out and get nice flow on the inside as you build up the tube. I like to TIG weld mine and then planishing the welds on a spherical dolly that is a good fit inside the tube,sometimes just a big ball bearing welded to a length of strong steel bar. Pie cutting also allows bends in multiple directions on a short length of tube. This is great for exhaust headers,turbo manifolds and rigid inlet tubing. Most racing car exhausts are made this way. I remember making expansion pipes for my Suzuki RG500 his way,oh happy rasping and popping days!
@stevie9361 6 жыл бұрын
I just wanted to add that you need to determine how many pieces you want by how close to a smooth radius bend you need and how much welding you want to do. Take off for a short radius 90 is diffrent from long radius. Then you take 90 an divide by how many pieces. Ex90÷6=15degrees. I find 4.5 an 9 degrees works for larger pipe but if your working on smaller pipe or don't really care about smooth air flow you can try 22.5 degrees for your 45s an 90s. Also be careful when cutting because the pipe is going to oval a bit
@justa_dude 7 жыл бұрын
Pie cuts are cool af. Tip: add some basic vids for the noobs. Like magnetic welding clamps. Metal markers. Vise grip clamps etc.. Keep the cool vids coming. I enjoy your channel.
@Thefabforums 7 жыл бұрын
will do
@bikerplanet 7 жыл бұрын
I agree. But clamps, metal markers, etc.. would all fit under the 'you need this tool' video. At least that is my opinion. Maybe a noob section of 'you need this tool' :) j/k
@radiowallofsound 6 жыл бұрын
I dont have any chance to bend tubes, so I thought I'll search "cut & weld tubes" on youtube, and here I am, exactly what I was looking for, great vid!
@Thefabforums 6 жыл бұрын
+radiowallofsound awesome. Thanks
@serviceoverself2375 9 ай бұрын
You have made this amazingly simple. Thanks.
@meangenevstheworld.7773 5 жыл бұрын
Pie cutting is the devil. Lol we once fabbed a Pie cut 90° elbow with 6' od for an industrial furnace out of 3/8" plate. That was my biggest fan job so far. Measure, torch cut, then rolled to circumference.
@Thefabforums 5 жыл бұрын
yeah its not my preferred choice
@TheFabricatorSeries 7 жыл бұрын
Thanks for the shout out!
@Thefabforums 7 жыл бұрын
No problem
@michaelcooney7687 4 жыл бұрын
Get a square section and weld it to the end of of the precut pipe make your north,south,east, west marks on the pipe/tube ... then when you cut you have 90 degree reference marks to turn your fittings any which way...😎
@R5GTT 10 ай бұрын
I like your explanation of how too all the way from the UK London 👍🏽
@jamesgulrich7416 7 жыл бұрын
I did some pie cutting on 6" thick wall well casing for a rocket wood stove. Lots of fun ... oh yeah .. ah lots of welding too. Great video!
@charliemarks6096 6 жыл бұрын
Thanks for some fabulous tips. I've really got to try this out and weld some bends with my powertig.
@Thefabforums 6 жыл бұрын
no prob
@tannerjacobson5729 7 жыл бұрын
Thanks again Kyle for another great video! You sir have made me an addict to fabrication.
@Thefabforums 7 жыл бұрын
awesome. thanks
@Automaticrepairco 7 жыл бұрын
I think this was the best video in a long time. thanks for posting it up.
@Thefabforums 7 жыл бұрын
thanks
@silverbackanimal7215 3 жыл бұрын
Many different ways I’ve been shown but this is buy far the easiest and best 👍
@DougBugBuilder 6 жыл бұрын
You just passed some of your knowledge to me..... I promise I will put it to good use. Thx.
@Thefabforums 6 жыл бұрын
awesome
@popskull6617 3 жыл бұрын
I struggled with pie cut too until I found a company that makes a tool for making it so easy now check them out ( vpg exhaust systems ) lost lest waist
@matthewschwass8019 3 жыл бұрын
Just curious how do u know how long to make each cut? If it takes 10 peices for a 90* can u figure out the centerline radius figure circumference divide by 10 to mark your cut marks on the centerline?
@callmenortnortin467 7 жыл бұрын
Determine the angle of cut for any fabricated turn by: Angle of turn DIVIDED BY the number of joints (welds) multiplied by 2 Example making a 2 piece 90 degree turn- 90 divided by welds X2 is 90 divided by 2=45 degree cut. for a 3 piece 90 degree turn its>> 90 divided by 4 (4 being the number of joints X2) so,,90 divided by 4= 22.5 degree angle of cut. Will work for square or rectangle tubing ,wood too .
@Thefabforums 7 жыл бұрын
that would work if you wanted 22.5 degree cuts on your pies but no one wants that.
@bananapudding3051 7 жыл бұрын
The Fab Forums whats he is saying is its a simple way to figure up degrees for how many pie cuts you desire 90 divided by 10 = 9 so 9° miter cuts so what if some one didnt want to use 9° or 18° miters then this is just an easy way to fig it out all he was saying so a 15 piece 90 would be 6° miter cut
@callmenortnortin467 7 жыл бұрын
That will work for any number of degrees of turn (22 1/2, 45, 90 etc.) YOU decide the amount of turn AND the number of "pie slices"youwant. it's still the same formula >> Angle of turn, divided by (number of welds as in"joints multiplied by 2) It's a basic pipefitters manual formula.One size fits all LOL. I hope my explanation isn't confusing. Thanks for your informative videos .
@jacobhoke581 7 жыл бұрын
callmenort nortin Franklin book ftw
@callmenortnortin467 7 жыл бұрын
Pipe Fitters Handbook- Thomas W Frankland. Have one I've had since I was an apprentice, 50 years ago :) Thank You
@mason8725 7 жыл бұрын
Nic dont get hung up on the end result of the build, enjoy watching the journey, once it's done we wont get to see any more cool fab work on it.
@Thefabforums 7 жыл бұрын
lol...yeah I will always have something in the works though
@Wrenchlife604 7 жыл бұрын
Solid info. wish i knew this when doing my header last week...
@Thefabforums 7 жыл бұрын
lol
@kendaleklund7475 7 жыл бұрын
Wrench life 604 U will be ready for the next project!
@rosehenderson4557 3 жыл бұрын
The other good way to mark both sides of a tube to make it equal is hold the tube on a straight surface and lightly spray paint or steel blue on each side close enough, then take a square along the sides making a true 90 degree from each side !
@domingosliborio3168 7 жыл бұрын
Thank`s to explain my daily job!! There are more "pros" for this kind of turns. Metalcustom PORTUGAL
@jamojamison3962 4 жыл бұрын
Chuck that pipe up in a stand and use a center finder punch for the perfect center top and bottom front and back and use a straight edge to make the line . No math so its faster if you got a big enough pipe length
@shitbox7413 7 жыл бұрын
I feel like a lot of pie cuts are more opportunities for cracks, I could be wrong though. I agree with you Kyle, I would use mandrel bends over pie cuts, but I would use them if I had to...
@Thefabforums 7 жыл бұрын
that is probably true
@ClimptonDiddlehopper 7 жыл бұрын
Shit box when I've done it in the past I had luck by tempering afterwards like knife makers do. I also try to only tig so I can control the heat better. Doing those I haven't had any leaks on fluid transfer or pressurized air tubing.
@shitbox7413 7 жыл бұрын
Billy Beane, All depends on the application I guess...
@joshgandy7707 7 жыл бұрын
I can see where that could help. Kinda like stress relieving huh?
@goose27162 7 жыл бұрын
Yup, most of the time when you weld any metals you are changing the temper or hardness of the material. In knife making you temper the steel to give it it's strength back. So tempering your bends or cuts after welding is going to regain the strength lost due to heating and welding.
@zayres29 7 жыл бұрын
ti is really easy to weld and it almost always makes a pretty weld I think you will enjoy working with it I have played with it a little at work
@maxy2237 7 жыл бұрын
nothing beats the good ol laser eye ball.
@Thefabforums 7 жыл бұрын
+Datsun son lol..true dat
@nathon21887 7 жыл бұрын
Great video, didn't realize so much went into pie cutting pipe!
@Thefabforums 7 жыл бұрын
thanks...yeah most dont make it that precise I dont think
@nearpar 2 жыл бұрын
Thank you really helpful
@bikerplanet 7 жыл бұрын
I Thank You so much for doing this video. It was great information, broken down into ways even I can understand.
@Thefabforums 7 жыл бұрын
awesome. Glad I could help
@nooneisrightallthetime-zv7hs 7 ай бұрын
this pie talk makin me hungry
@redlinepaul4546 7 жыл бұрын
hey, you can buy 3"x 10 feet aluminum electrical pipe for $25-35. Take it to a local muffler shop and have it bend the way you need it. It's a cheap way to cold pipes for turbo set up. You can get sizes up to 2"-4" straight pipes in 10 feet lengths and you can get 90° and 45° degree elbows that cost the same as straight 10 feet pipe.
@alecparkes5036 7 жыл бұрын
but good pie cuts just look cool, and you cant really bend titanium
@DanielLopez1994 7 жыл бұрын
Good video! I'm interested in pie now!
@Thefabforums 7 жыл бұрын
lol
@outbackenduro7418 5 жыл бұрын
Great presentation and information thank you
@nicholasluoma8265 7 жыл бұрын
I needed this video right now! Love this channel! I am working on making a street tracker. In the garage every night....DOING WORK SON!!!
@Thefabforums 7 жыл бұрын
nice....thanks for watching
@sorusty5764 3 ай бұрын
Hello someome who knows how exhaust pipe restriction works on motorcycle... i have this headers with pie cuts on it... and the one who made my exhaust pipe headers didnt clean the cutted edges and its botherting me.. as if those would restrict the airflow in my exhaust system? Thank you for your answers ❤
@1loumellor51 7 жыл бұрын
There are some more math sums tat you can do which will allow you to calculate how to position the tube in the saw, so that every cut is identical in length.That will keep the smaller side of the pie the same on every cut - Or you could use it to make the first cut then build a stop to the saw
@martinzeller7242 7 жыл бұрын
great video very informative and simple to do with your explanation of the process
@Thefabforums 7 жыл бұрын
thanks man
@dalibortrkulja9582 5 жыл бұрын
great video
@nsalcedo22 4 жыл бұрын
Lots of great info here! Thank you!
@man-e4g637 5 жыл бұрын
Badass! Thank you sir! Only have 1 question. How do i perfectly measure 1/2 of the total circumference? I know a tape measurer doesnt read 7.065
@Thefabforums 5 жыл бұрын
kzfaq.info/get/bejne/pZqFqtOczcWpgps.html
@danielbrealey2924 7 жыл бұрын
That was very helpful, thanks!
@Thefabforums 7 жыл бұрын
no problem
@Jursaw 4 жыл бұрын
You can’t always use mandrel bends so thats when pie cuts come into play.
@jacobturner6646 7 жыл бұрын
This is sweet, man. Thanks!
@Thefabforums 7 жыл бұрын
thanks for watching
@garyeasdale1004 6 жыл бұрын
Two easy Thank you
@XMALDITOX666X 7 жыл бұрын
Great video, thank you for posting this!
@Thefabforums 7 жыл бұрын
no problem
@666MadDog 7 жыл бұрын
one question missing.. how long should one pie cut be or better, whats the feedrate per cut? I would install a fixture to my bandsaw or drycutter to have every time the same length of cut and turn the tube 180° per cut..
@PoweredByAus 7 жыл бұрын
666MadDog pie cut length will depend on the CLR you want. shorter pieces tighter radius
@Thefabforums 7 жыл бұрын
yeah what he said
@mess_it_up_matt7558 4 жыл бұрын
Theres a much easier way to do this... you clamp a piece of square tube that has the same ID as the OD of the pipe on the end of your pipe. Shim pipe up thickness of material of the square tube in the jaws, Set saw to 4.5, 7, etc etc, set your stop, make cut, rotate pipe 180 degrees to the opposite face of the square tube, rinse and repeat.
@Eeropolvasti 5 жыл бұрын
So, you weld cuts together,...obviously?? only outside?? thanks =)
@Thefabforums 5 жыл бұрын
yeah
@user-nv6rk4wk2e 6 жыл бұрын
thankyou
@VladekR 7 жыл бұрын
U did it again, I just order two of thar sample kits
@Thefabforums 7 жыл бұрын
lol....
@magnus5356 6 жыл бұрын
A much faster and easier way to mark tubes with zero math: Take two pieces of the same diameter and same lenght, tack them togheter at the ends (like a shotgun) and just pull a straight edge along them on both sides when laying flat.
@Thefabforums 6 жыл бұрын
+Magnus yeah
@emmanuelchukwuma6655 2 жыл бұрын
What if I want to divide it into three pieces only what will i do?
@SP_Hatter 5 жыл бұрын
Thank you, you gave me a lot to think about.
@dklopp 7 жыл бұрын
Good info. Thanks for the video!
@Thefabforums 7 жыл бұрын
no problem
@KrisDebell 7 жыл бұрын
can be done a tiny bit quicker, for example 40mm diameter tube clamped to the bench, 20mm piece of scrap held against it...draw your centre line along that both sides...
@Thefabforums 7 жыл бұрын
for sure....I wanted to teach the principle behind it though
@KrisDebell 7 жыл бұрын
And you did that well. Great videos BTW, what about next friday you highlight a tool that has saved you the most time, doesn't matter what it is :D Mine would be the hydraulic hole punch.
@noahwalt492 7 жыл бұрын
right on! Thanks bud!!
@Thefabforums 7 жыл бұрын
no problem
@patundeath879 7 жыл бұрын
Noah Walt
@MrSuperchargedv8 7 жыл бұрын
what would be the ideal tool setup to cut straight, clean, repeatable, cuts on the tubing?
@Thefabforums 7 жыл бұрын
probably a good band saw
@MrSuperchargedv8 7 жыл бұрын
I have a horizontal/vertical saw and cuts seem to never end up perfectly square is why i asked; I'm working with 16 gauge tubing so the cleaner the cut the better off i am.
@welderguy0000 7 жыл бұрын
A good centre square will find the half way point quicker :)
@Thefabforums 7 жыл бұрын
true dat
@welderguy0000 7 жыл бұрын
That said. It's always good to know the math behind it. Kinda like doing long division.
@celsoguajardovillarreal 7 жыл бұрын
muy buena explicacion. saludos. y gracias.
@Thefabforums 7 жыл бұрын
thanks
@whatevericall 7 жыл бұрын
The weld seam would only work if they were cut from the same pipe in the same run I guess. It would be nice if they marked the kit ones first
@Thefabforums 7 жыл бұрын
they purposely cut all the pies perpendicular to the weld seam
@whatevericall 7 жыл бұрын
ahh ok. makes sense. so you could use different pies from any different kit and they would all align?
@rfluck 7 жыл бұрын
Custom Metal Concepts what web site are the pre cut ones from?
@elijahcbr6009 7 жыл бұрын
post a vid on how to mirror polish those ti pieces.
@MetalGear_Markie 5 жыл бұрын
When u try to watch a video and the start with a fox body in the garage. I found the right video
@jobsopportunities9761 4 жыл бұрын
Great content bro i like it
@tcrenegade 7 жыл бұрын
Love your videos man, did you need to close down the forum? Hadnt' been on in a long time and can't seem to find it
@Thefabforums 7 жыл бұрын
Thanks....yeah it wasn't being used and wasn't cheap to maintain so I closed it.
@tcrenegade 7 жыл бұрын
Its too bad forums besides facebook, pinterest, twitter, etc, are becoming a thing of the past. Makes it so hard to find good content. Thanks for keeping up the good videos and having the forum up when you did, I learned a lot from it. Keep up the good content man!
@4wdaddict41 2 жыл бұрын
Could i cut a prebent 4inch 45 degree elbow to make it 43 degrees ?
@Thefabforums 2 жыл бұрын
yeah
@rodrigodiego6304 6 жыл бұрын
Thank you by vídeo!
@marinholima5193 7 жыл бұрын
Parabéns amigo muito bom
@Astrix_Jaeger 7 жыл бұрын
thank you, I need this for my project..
@Thefabforums 7 жыл бұрын
no problem
@trentoncoleman613 6 жыл бұрын
goddammit. math has found me once again
@aaronpeople101 7 жыл бұрын
Thank you for this video
@Thefabforums 7 жыл бұрын
no problem. thanks for watching
@jaywhy225 7 жыл бұрын
Because, maths
@Thefabforums 7 жыл бұрын
lol
@alexbruce6937 7 жыл бұрын
The Fab Forums Is the cage in the goose and custom cage, or is that the competition engineering 8-point cage?
@Thefabforums 7 жыл бұрын
custom
@garrisongarage1505 7 жыл бұрын
Do you even MATH bro? ;0)
@thysdreyer6886 3 жыл бұрын
For once I actually learned something from a KZfaq video .
@craigfuller6187 7 жыл бұрын
Nice job
@Thefabforums 7 жыл бұрын
thanks
@robertford1329 7 жыл бұрын
Again, Awesome,,,,,
@Thefabforums 7 жыл бұрын
thanks
@jsnismo240sx 5 жыл бұрын
Is this the same for oval piping?
@Thefabforums 5 жыл бұрын
you wont be able to clock oval pipe
@ronmower3694 7 жыл бұрын
Awesome
@Thefabforums 7 жыл бұрын
+Ron Mower thanks
@stevewilliams2498 7 жыл бұрын
how do you measure 1/2 of the circumference ? with a tape ?
@Thefabforums 7 жыл бұрын
yeah or a piece of paper that is the proper length
@burntsilverado 7 жыл бұрын
I want a hat but it says sold out. any idea on when you'll have more
@Thefabforums 7 жыл бұрын
should have some more soon
@rfluck 7 жыл бұрын
What is the company he's saying you can buy them from?
@Thefabforums 7 жыл бұрын
Ticon Industries
@bryanmichalski175 7 жыл бұрын
So what you're saying is the Bibbster will be turbo'd.
@Thefabforums 7 жыл бұрын
lol....yeah
@Hunt904 7 жыл бұрын
But how do you figure out where to make your lines ?
@Thefabforums 7 жыл бұрын
+Adam Hunt doesn't matter as long as they are exact opposite
@izaakbennett9482 6 жыл бұрын
Can you do this on square tube?
@Thefabforums 6 жыл бұрын
I would think so....atleast in to 2d
@izaakbennett9482 6 жыл бұрын
The Fab Forums how would do it in 2d?
@mileswatkins6472 6 жыл бұрын
Under what circumstances are 4.5 degress better than 9 and 18 ?
@Thefabforums 6 жыл бұрын
+Miles Watkins the smaller the degree of cut the smoother the bend.
@mileswatkins6472 6 жыл бұрын
The Fab Forums most definitely just subbed Thanks
@Thefabforums 6 жыл бұрын
awesome
@Dr_Xyzt 6 жыл бұрын
The smaller ones are easier to fine tune. Otherwise, you'll have to sit there and grind an 18 degree piece to fit. Mathematically, we have a thing called shift. Lateral shift makes the pipe look smaller. At 4 degrees, you have a 5% vertical shift, with a 99.9% un-changed lateral. 9 degrees is a 13.5% vertical shift, with a 98.6% horizontal accuracy still. 18 degrees comes in at 30% vertical shift, 5% horizontal. Percentages matter when you do flow calculations. You'll find results on a dyno if you run a 26 degree pie cut with its 10% longitudinal interference. 18's are hard to find even in a laboratory. 9 and 4 are so fine, you can add them and get away with it, penalty free.
@irate74 5 жыл бұрын
You show the math and half of the circumference but dont even show how your half way mark on the other side equals 7.065
@geraldgutierrez1780 6 жыл бұрын
what kind of tubing and how think of tubing did you use?
@geraldgutierrez1780 6 жыл бұрын
thick
@Thefabforums 6 жыл бұрын
I have used all kinds....depends on what you want to do
@samwisegamgie8163 6 жыл бұрын
Most exhaust tubing is electric weld or stainless and the wall thickness is .065 thick. In most applications anyway.
@TheMick26 7 жыл бұрын
Never first. Hey Kyle. 🙋
@Thefabforums 7 жыл бұрын
lol....you are today!
@TheMick26 7 жыл бұрын
The Fab Forums Haha! Every dawg has his day. 😆 As always, thanks for the great video, sir.👊
@amolghagare3439 6 жыл бұрын
Tq sir
@SMTMOTORSPORT 7 жыл бұрын
fuck yeah i need this to do my next youtube video thanks kyle :)
@Thefabforums 7 жыл бұрын
awesome
@hopelessdriver2584 7 жыл бұрын
just in time :D i am doing exhaust on my atv project and i don't have pipe bender
@Thefabforums 7 жыл бұрын
perfect
@jonyrodas 3 жыл бұрын
😃
@mrnokhd2369 6 жыл бұрын
Youตัดยังไง?
@bradfordcustoms7588 4 жыл бұрын
Skip to 7:00
@chrisjones6165 6 жыл бұрын
Props on knowledge and showing but wouldn't it be easier and pry cheaper after time to buy a fitting? Not talking shit just asking
@Thefabforums 6 жыл бұрын
yeah buying bends would be cheaper and easier for sure when working with standard materials buy when working with exotic materials like titanium and inconel this the better alternative. You can also do radiuses not found in stadard bends.
@chrisjones6165 6 жыл бұрын
The Fab Forums what about warping and heat issues with them exotic materials with all that welding is my issue. Seems would take lots of gas to purge and lots of time to cool but I've never done this on an exotic material so just a guess on my part. Thanks for response
@MrDilley777 6 жыл бұрын
This is the first video using titanium as a header material, how many people can afford this??? How about mild steel pre pie cut source instead?? I get you can do complex bends this way that a mandrel bender cant do.
@ledward95 7 жыл бұрын
No weld?
@Thefabforums 7 жыл бұрын
nope just instruction
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