Pattern Making- Square to Round Transition

[@MrMattchu73]

Thanks for making this video. Too many people in the crafts will not take the time to actually show you how to do things. Or simply don't have the time on a job to do so.

[@daveosland3199]

You''re welcome! Dave

[@manyglacier1980]

Thanks for the refresher. I did this years ago in drafting work, later forgot it, and recently needed it again to make a similar transition for a saw's vacuum port.

[@daveosland3199]

I thought i was putting together a truly "nerd" video! Glad to see a few people taking interest in it! Dave

[@baloo2327]

I just wanted to say thanks for putting a wonderful, and informative video together. Because of this video I was able to make a fitting that I needed for work. I was able to install an air conditioner in a duct system that nobody else thought was able to be done, and the air flow was greatly improved. It was a 13" X 19" to 16" round with a 6" offset. You gave enough of the basics here to help me get it done. Again thanks.

[@0johnny082]

this channel is great, im a roofing sheet metalman, and thus far am self taught. I have been looking for instructions on this topic for a while, this is probably the most indepth and easy to understand tutorial I have found. Thank you . I look forward to incorporating this knowledge in my work.

[@davidosland1440]

Thanks- i hope to be able to find the time to do some more- Dave

[@shawnmacgillemhoire5849]

Few things, one, thank you for helping to teach future tradesmen what they will need to do the best job they can. Second, you can make the square to round in one piece while avoiding brake lines by using a roller to bend the round portion of the piece. this is accomplished placing the piece in the roller as if you where about to bend a segment in a brake, next you need to place a pair of clamps on the square of the square to round in order to disallow it to be rolled. After this is done, roll one quarter of the piece and open up the roller and reposition to the beginning of the next quarter of the piece. Lastly, when bending a square to round, each quarter of the round must be bent at 90° (as 360/4 is 90) to figure the angle for each bend you take 90/number of bend lines (so four bends would be 22.5° per bend NOTE: for centered square to rounds only). Personally I recommend not laying out in a manner that would cause you to need more than 10° per bend, this will ensure the round is a respectful round. Please feel free to question anything I have stated, I love constructive conversation.

[@BISONOWNAGE]

This video is great very well informed and very well presented no stops just got on with it, helped me a hopeful sheet metal fabricator a great deal I had a lot of trouble trying to understand how the older fella's at work did this stuff and nobody had time to show me because we're super busy all the time I now feel a lot more confident tackling this.

[@marktheiss9357]

Just did a rectangle to round a few weeks ago 88 inch true height 112"x118 base with a 56" diameter hole . I had to use half the shop floor for the layout. I'm an apprenticeship teacher for our local insulation trade and you use,an lot of the same techniques that we use. So I'll be sending our students your link so they can do homework.

[@daveosland3199]

That was a biggun! Dave

[@Friend_of_the_One-Eyed_Ladies]

Nice! What did you use to draw the pattern on, and how did you transfer it?

[@johnjordan3365]

Dave, here is a helpful hint. When laying out an on center (both ways) sq. to rd. extend D-1 and C-7 towards the round end until both meet above the round to form an apex point. Set the dividers from the apex to round points 1or7 to scribe arc for round.

[@0johnny082]

This demo was super informative, I make these all the time and I use .75" standing seams to fasten both sides. Thanks for providing a easy to comprehend understanding of these adapters.

[@eideticex]

Thanks, never had to make one of these but I find myself needing an adapter for an old table saw to a dust extraction tube. Was going to waste a lot of paper figuring it out before I seen this and realized I was way overthinking it. Now I feel confident I can get this done quickly and accurately.

[@jamesdunn1495]

Hey Dave, Great videos. You're very good at explaining the process and the reasons behind each measurement. I'd love to see the process for making an offset square round and also the process used to make the round opening larger than the square opening. Great videos, keep up the good work.

[@TheDz1991]

I must say how refreshing to see this done with a Pencil and Paper, infuriating to see it done on a PC.

[@gregoryg.5589]

Thanks for posting this tutorial video Dave! I missed the square to round lecture in my WLD 121 class, so this helped a ton! Keep making tutorials like this whenever you get the time! Thanks again!!

[@mtpoland]

Thanks for the tutorial. I used to have to do this kind of stuff when I worked in sheet metal a few decades ago, but I've forgotten most of the formulas. I am making a radiator shroud for my 1960 Ford pick up, so this video is going to help. And I like the idea of the old school approach as opposed to the computer generated stuff.

[@daveosland3199]

thanks! Knowing how to do this gives a deeper foundation to layout and fabrication... dave

[@MrMckstyle]

Thank you for the knowledge. What would be different doing a rectangle to round. You really are a great teacher. I have watched many videos on this subject. This one is the easiest to understand.

[@gabysroastedcorn8940]

Thanks I used to be a union sheet metal worker and this is the way it was taught in the union. Local 104

[@sshwami]

my best you tube tutor . thanks

[@hangngoaigiare]

Thx Dave. Another great videos.

[@yoschanel194]

Thank you sir...your experience educates us as the next generation

[@otisbobbitt784]

Thanks man, for putting out some English teachings. I just started working with this insulation company where they use PVC and Metal. Work with all Hispanics so it's hard to catch on. Thanks again for the videos.

[@jackduffy6620]

thanks so much for sharing this knowledge Dave!!! Great stuff!

[@sharlfortier2476]

Hi Dave, just wanted to say that i love all of the drafting video you have put online. i have a little request. Could you make videos on how to make a square to round with a offset, oval to round fitting and oggee offset elbow. Thank you for your time.

[@mehdirezasalmanfard2752]

Hi Dave , thanks. Can you show at another video to draw gooseneck venting please? Thanks

[@stephenmarshall4581]

very helpful in learning this stuff not much of a book person so seeing it makes sense thanks

[@elviejonnumerouno]

thank you dave ,for sharing your knowledge with us.

[@daveosland3199]

Glad some find it useful... Dave

[@googacct]

Thanks for demonstrating these pencil and paper techniques. I would love to know where I can find a big compass like yours. I searched on the internet and could not find a place that sells them.

[@purpleduke77]

Thanks Dave brilliant video, it worked perfectly for me. Keep making these videos. Paul from UK

[@daveosland3199]

Glad it was of some use. When I made these videos, i thought only a few people might be interested! Dave

[@randallhoggard4328]

Mr. Osland, Thank you for your tutorial; it fulfilled my need perfectly. I am building a router table and need a 12” X 12” to a 3” round, 6” tall to fit under the router for dust collection. I will buy 30 gauge, 3' X 2' sheet metal at Lowes, layout the square-to-round per your direction, bend it on a bench, pop rivet it together, connect it to PVC and on to a shop vacuum. The only comment I have is that using dividers to measure the circle segments might not be accurate enough in some applications. Twelve straight line measurements will be shorter than 12 arcs. A flexible ruler will measure the true length of the arc. I am going to use your method verbatim. Thank you again Sir.

[@AXMPaperModelsTutorialsandMore]

Thanks for the video. This is great stuff!!

[@mattspencer6660]

Hi Dave, thanks for putting this up, I have to make one of these for the first time in 25 years and am obviously a bit rusty - it's great that you took the time to put up such a detailed methodology. Is rectangle to round more or less the same thing?

[@AfricaDevelopmental-Projects]

what a great teacher u are. thanks a lot

[@daveosland3199]

+Alexander Munzvandi Thank You!

[@camco.welding3009]

Awesome videos. Helps me out alot at work. Can you make a video of saddling a 3" pipe to 4" Long radius 90. With matching centerline. Thanks. Keep up the good work :)

[@tellokokoropo3388]

Good guide lines to grab everything for ones future

[@tweek2099]

And if the circle is bigger than the square? I can't find the method for that anywhere.

[@richardmontanez7389]

Great videos Mr. Osland, Would the same steps apply to a rectangle to round and a larger round diameter then the rectangular dimensions?

[@daveosland3199]

Good question! A bit different to layout- Try this video- kzbin.info/www/bejne/r4rGpo2BrNZomKc He goes from round base to rectangular top- just draw a square top instead of a rectangle on the initial layout... Dave

[@bishop5470]

yo fuck my local JATC apprenticeship program. we need teachers like you my man. Shouts out from local 83

[@koolcruiserful]

Great video wondering if you could do a layout video on a triangle to round transition

[@Trazadodecaldereriasysoldadura]

IT'S PRETTY GOOD

[@briantaylor6758]

Hello! Thank you for posting this video, this was very helpful. I do have a question, is there a way to make a square to round with the square being longer, and the round part being shorter? I work in sheet metal roofing, and am having trouble making a custom part for downspouts.

[@paulmerrell7823]

I know this is an older post, but to answer your question yes you can manipulate the square to a rectangle and on an angle. The Same with the round end. The video is for a concentric fitting what you are asking is for an eccentric transition. The same process just a few more steps. Also you must take the thicknesses of the material you are using. This is called triangulation, if you lay out pipe you use radial layout.

[@milobp1]

what kind of seam are you going to use and where are your clearances for those? If I was an apprentice and did that I would get an F or an incomplete which would translate to about the same my instructor was a stickler to those types of things especially to me because he envied my father who was the best heliarc welder in the business at the time and man did I hear about it on a daily basis (Your not gonna be a half assed journeyman heliarc welder like your dad when I get through with you) .

[@glennanderson6316]

G’day Dave can you show me how you make a ring fit inside a barrel cheers Glenn from Australia

[@anthonymachain8152]

Hey Dave thank you you're thinking you put up the video with a rectangular to round

[@danievandyk4666]

Thanks for replying Dave iam not familiar with program digital pipe fitter this is a pre trade assesment and i am struggling with the development of the intersection pipe

[@daveosland3199]

That's a high bar for a pre-trade test. Only the best pipe fitters are put to rigging those connections....

[@genecundel4793]

Nice job.. Thanks for the post. What size is that large compass and where are they available.

[@davidosland1440]

A lot of questions on the compass. I found it on line. HFT had them at one time....

[@atsugeM]

can u make one when the round is bigger than the circle example 1000mm x 400mm r-450mm H-600mm

[@MikeJones-ge7zw]

Well done, Nice and clear

[@Superheat]

what size and brand of bow compass do you have?

[@domenicomonteleone3055]

Good morning to you Dave osland iam a beginner at pattern design Drawing but would care to learn beacuse I care to learn more on Fabrication and I wNt to learn this so I could build my own parts for my car and bike what can a newbie like me learn for you I think alot

[@kevs3033]

Great tutorial Dave, you talked about doing this in Autocad, any chance you can do a tutorial I would love to see it's done.

[@joelevangelista2345]

thanks for a good info..ur such a good teacher

[@ramerojarabe6276]

Sir, what if circle is bigger than the square?

[@koolcruiserful]

thanks for the video it was very informative. sounds like you have many years of experience in the trade.

[@danievandyk4666]

Hi Dave just want to ask for help regarding the developing of a round pipe with off set round lateral 55 degrees.

[@daveosland3199]

Sorry- When i have to make an "offset" connection (non-symmetrical), I use a program like "digital pipe fitter". Some of these programs have a free download. Having access to a large plotter (printer) is a bonus for printing out these sometimes large patterns- Dave

[@rajonprince664]

Dave Osland

[@brettmussett1504]

Hello Dave do you have a video on development of a trunnions, and also marking it out on the bend ??

[@daveosland3199]

Trunnions as in a pivot support??? Check out "dave osland" and see if the other pattern processes might help... Dave

[@yinkadavies8403]

I can't wait to come to class tomorrow

[@udal1987]

Great ! I learning with you. My great online teacher for ferbrication. Thanks alot Sir

[@daveosland3199]

You are most welcome!

[@thomasanderson3785]

This is one I figured out from book but I don't do much of this because I never had to but I want to do anything that might come up and more knowledge means more capabilities very good explanation and very easy to understand very thorough thanks if u can give me any knowledge of lofting boat hulls I'd be very grateful Ive built boats but layout was already written down and id like to be able to layout any design myself so I can build all styles

[@davidosland1440]

I don't think I'm much help here. I've built 2 boats- a 31' trimaran from full size plans (bought), the other a 10' drift boat, but layed it out, full size plans, on paper. There is probably software that can assist you if you're up to that... Dave

[@plasma3211]

Dave, I was able to do the square to round transition using ACAD. I used smaller diameter circles i.e. 1/2 inch radius to keep track of the arc swings. I screwed it up a few times but i kept reviewing your video until i got it. I cut it out and taped it together so i know its right. I was tempted to switch to paper and compass but i kept at it until i had all the arc lenths correct and in the right place. I have one at work i would like to develop. Its square is 8'- 6" x 4'. It transitions to a 36" diameter pipe flange. It is 3'-11 5/8" away at a 45 degree angle. Any suggestions using this Square to Round Transition?

[@daveosland3199]

+robert morin That thar is a big-ass transition! A hopper in a processing plant? i'm not quite understanding the shape- 8'-6" square x 4' high or a 8x4 rectangle base? Any way, a pattern can be made for it. Because of the size, a quarter pattern rather than a half pattern would be more manageable, if it's a symmetrical shape, as opposed to an offset, in which case a half pattern would be necessary. I would probably try it on ACAD, and then plot a 1/4 or half pattern- Because of it's size, it might have to be plotted in 1/4's to be laid out on sections of the transition pieces- I bet a lot of us would like to see the final product!!! Dave

[@plasma3211]

The rectangular measurments are 98 in. in height by 102 in along its length. Yes it is like a hopper. It is part of a Hood system for a melt shop in a steel plant. It transitions to a 24 inch diameter pipe at a 45 degree angle. I was wrong about the 48 inch on the rectagular height. The transition begins at 52 inches down from the 98 inches. The measurement from that apex out to the end of the 24 inch diameter is 47 5/8 inch long at a 45 degree angle. I plan on starting the layout using half the piece and then dividing that in half as well. It will be a hell of a layout, wish me luck-lol!

[@daveosland3199]

+robert morin Ya gotta get us some pics along the way and the the finished product!!! Dave

[@plasma3211]

I will try. This thing is a mind bender and it will take me some time. I may have to do it on paper first since it is complicated. I am having trouble with the view representation but i will keep at it.

[@plasma3211]

+robert morin Ya i'm lost! I tried to develop a pattern using the square to round method with no results. I know how to find the true length lines but i am having trouble with placing some of the points. It is 36" high by 51" at half length. Over all it is 103" in length. It truncates at 45 degrees to a round diameter of 24". Can you offer any guidelines as to how to accomplish this? I hate to give up on a problem and feel defeated. I can try to replicate it in ACAD and upload it for clarification if needed. I have a full size print of the project so all the data is there.

[@sovietshanmukhadas9801]

Thanks for the tutorial. It's very much informative.

[@larryphillips5753]

Where do I get the paper for laying outs templates?

[@noonce]

I'd also like to know. Haven't found it

[@Friend_of_the_One-Eyed_Ladies]

Any paper will work, it just might not have fancy ruled lines on it like this guy's. Just start drawing, and if you need more space on the paper, just add another piece of paper using scotch tape on the back of the page. For larger pieces, you can use cardboard, old desk calendars, roll-ends from a newspaper/printing shop, etc. Most office supply stores in North America sell 11x17 printer paper, which is double normal Letter size paper. If you don't know how to construct perpendicular lines or bisect measurements using a compass and a straightedge, it's pretty easy, so go search the internet.

[@awsom70]

great video thanks for your help it is much appreciated

[@mirukiruuu]

Thank you so much! This video helped me alot

[@Hermancoy]

kvak kren pak

[@K_Strag_720]

Such a union way of learning this. And btw hand rolling makes for a cleaner product

[@ger5856]

Nice work, Great skills

[@Onionbaron]

Thanks , very informative for my sheetmetal pupils!

[@daveosland3199]

I'm glad to see students are being taught the basics!! You're giving them a basis that others won't have! Dave

[@moubachiroudimon7004]

Très bon travail mais encouragements ma question est la trace sou forme de elle (L) c'est à quelle mesure veiller m'expliquer s'il vous plaît

[@rhiczgartv3410]

Good job bro!,same my vlog about ducting,watching from philipines

[@Freedom-qs9kl]

if the round is bigger than square .how can we make this

[@Freedom-qs9kl]

?

[@NOOne-im5vg]

The triangulation method is the same in both cases. When developing patterns for thick plate, you need to work with inside dimensions of the square and mean diameter of the circular end.

[@Hermancoy]

Kren masrer

[@timmiller9666]

Great video!

[@aaryannortheastenvirotech1894]

can anyone please tell me a book or any other resource to learn more concepts related to this?

[@daveosland3199]

Hi- a great resource I've used is "Sheetmetal" by Leo Meyer Dave

[@aaryannortheastenvirotech1894]

@@daveosland3199 thank you very much! i've started working in a fabrication firm but there's no one i can learn technically from so ive been seeing things practically being made and then reverse engineering them so learning the concepts might help me to do work more efficiently

[@lancethomas3669]

Thank you so much.

[@julsc2106]

You're amazing thank you very much

[@marktheiss9357]

Great job btw!

[@Lifestyle-y5s]

Nice job

[@richardsimpson3433]

great video

[@motopeek]

Can youbplease help me how to create a pattern for a head peel development of a bullet lpg tank?

[@joshharper6791]

Do you mean an "orange peel head" as used in capping pipe? Hobart puts out a video on it. (and others) Fabricating a head for a pressurized LPG tank? That would concern me if it was used in a pressurized situation.... In any situation, making a template on heavy paper is always advisable before launching into cutting up metal.... Dave

[@motopeek]

Josh Harper yes sir, but with a crown plate at the center of the peel. And it is used in pressurized vessel tank.

[@haymannsaif4334]

Thanks a lot 😍

[@flex247]

where did you get your compass from?

[@daveosland3199]

Dug around on line....they're not easy to find.

[@ephraimdapo5998]

can you please mak a video of a pattern with a bigger circle. . ? thanks in advance

[@daveosland3199]

It's the same technique for any size.... dave

[@ephraimdapo5998]

i mean the circle is bigger than the square sir dave

[@Friend_of_the_One-Eyed_Ladies]

@@ephraimdapo5998 It's still the same technique. Start with your side view and overhead view drawings, and try it, you'll see.

[@suhailkhsn8733]

very good job

[@dblhydragroup]

Thanks sir i need layout of round 8"/ 4"×4" size duct fabrication fabrication full formula

[@shubhamshelke5442]

300x89 mm square and Od 273 circle

[@pikifrino]

Good job, thank u

[@elangovanelangovan5745]

bro I want dia 6inch and square 1 feet to 3 inch unsize videos

[@saidelbahlouli384]

thank you for this cours

[@Friend_of_the_One-Eyed_Ladies]

You must be using Staedtler pencil lead if it breaks that easily. Total garbage! For a 0.5mm pencil, I like Pentel Super Hi-Polymer 5H (Pentel #C505-5H). That's also a bit harder (5H) lead, so not as dark, but it makes a finer line and stays sharp longer. They do make softer lead too: 2B, HB, F, 2H, 4H, etc. I am not associated with Pentel, I just really like their pencil leads.

[@daveosland3199]

I use Pentel HB "Super"- i'll try they're others! Thanks

[@ashok98680]

Hi sir how are you plz explain me about round duct 90 degree elbow plz reply me sir

[@canadiannuclearman]

this will be replaced with cad and software. with calculayed press break angles.

[@Friend_of_the_One-Eyed_Ladies]

Not if you're on a remote worksite and the shop screwed the part up and you have to make a piece onsite. Here in the real world, that happens a lot.

[@faizanchohan4635]

very nice video sir good

[@plasma3211]

Sorry those dims were with a 24 inch. pipe not 36".

[@AfricaDevelopmental-Projects]

Hw do yo fabricate a square bend tapper

[@davidosland1440]

Gores (round cross-sectioned) bends are done in segments. Or square cross-section bend, also usually in sections.

[@AfricaDevelopmental-Projects]

I need a demonstration. I can do round ducts but never square or rectangle

[@uniwolf_46]

Thank you😋

[@stephenbarrs7696]

Jesus dude, I can tell you work in an office . I could have made it in the field in half the time it took you do this tutorial!

[@daveosland3199]

Sorry, man, but I work on job sites all day long. The tutorial is for those that want to learn the basics of layout...

[@Friend_of_the_One-Eyed_Ladies]

@Stephen Barrs: Explaining stuff always takes longer than doing it. Unclench.

[@ramerojarabe6276]

Thank you sir. More video for duct transition.

[@sujimonrpillai3092]

Ohh very nice

[@lalitpatil2934]

thanks

[@nakibulshaikh4546]

R u great teacher sir very very thanks .next round elbow 90' claideing

[@ibrahimme7339]

nice

[@satendrasachin]

THANKS