Rollation 3 - Square to Round

I learn so much from your videos. Amazing.

its a real success and more than that you can teach how to do in 20min. much appriciated.

I just re-watched this video Ron, this is going to be a great technique for making part of a transmission tunnel I’m working on that has a square-ish shape at one edge and a round opening at the front for the bell housing. Really great information in this video, huge thanks for taking the time to make it!

I mean, what can one say but; BRILLIANCE! I watched the video in hopes of figuring out how to make my own 16"x16"x12" square to round transition for our home HVAC unit. Although every bit of this video is on target I have a question as to, how would I add a 2-inch lip around the rounded side, effectively creating a protruding 2-inch cylinder which is where the ductwork hose would get attached to?

Very nice

Excellent work, but I think I'll stick with either Square or round , one or the other.

Thank you, Ron!

Such masterful work.

Excelente .. para trabajos para la NASA.🇲🇽 🤗🤗🤗

Nice video. Keep it up. I have used rollation to design paper model aircraft. Try rubbing chalk on the edges of the form. As you roll it across the paper, it will outline the pattern.

Because you want eight divisions, you can use a technique to bisect an angle with a compass three times rather than guessing with the dividers.
Draw that arc like you did, then set the compass to somewhere more than halfway the distance across the angle to the other point.
Draw two arcs between that intersect like a football; connect those points and you have a line that perfectly bisects the angle.
Repeat to get quarters, repeat to get exact eighths.

Can I make it with the square part smaller than the circle?

can we make a rectangle to round?

Wow. I free-hand these, but this is so spit-and -polish. Nice.

I sit here watching this video thinking that's so easy even i could do it. I've got enough experience to know in reality it really wouldn't look anything like that..

Really interesting ,informative and relaxing to listen to your advice Thank you very much .

I used to brake, up to 6' x 4' sq to rounds in 4 pieces out of 12ga SS on the old All Steel power brake back in the day as an industrial tin knocker. Fun stuff right hand working the CNC controls (not at the same time) but a bitch on one's left shoulder. I would do like ten in half a shift (40 pieces) and had to keep track of them if they had off sets, with a guy on the left side that had no clue what we were doing, just holding on as I yelled at him what to do, they always gave me a different helper. LOL

Easier way to divide a known space like your arc into even segments is to take a number divisible by your intended division count (8), like 16. take a ruler and line up 0 on one side and 16 on the other, mark every two inches and those are exact points to draw your eight lines back to the center.

That's cheating

That was GREAT!

Amazing! what a great video

Hello,
Sir, you must have come from a long line of thinners. Your work is extremely interesting. Thank you.

As always, an exceptional video! Always learning watching your videos.

I really expected this to be MUCH more complicated! 😳

excellent~~~~~~~~

Good for Apollo XIII

Amazing! I watched the whole process with my jaw dropped.

this idea is difficult no body understand .

I'm searching for the long time how to make expansion joint but I cannot find, but when I watch your video maybe, just maybe can you show us how to make one,,I really don't know how its done,,,by the way nice video sir,

I've always heard of rolation but wow what a long variable way.
I was learned in apprentice school triangulation with dividers or trigonometry on a calculator. Would never be able to roll it. Some of our square to rounds where quarter inch material, 20 ft diameter even the brake mark spacing and degree had to figure,quarter inch just don't give. Happy I seen rolation done though

Interesting my first transition piece I calculated every angle and dimension to make my flat pattern. This way is much easier.

That young man is brilliant and brilliantly well explained thank you!

Awesome!

Honestly how is everything so scary clean

Great reminder! Thank you. Very early in my engineering career I design and built both cement mixers and garbage trucks. We did it usually CAD. YOU CAN IMAGINE that the drum of a cement mixer is just a dome connected to numerous cones. I took a sizable number of designs by hand drawings and put them in CAD and then fine tuned the numbers using true calculations and added in Bend Allowance calculation depending the type of bends or rolling process. I would bet the first cement mixers were developed the same way you layed out. Good memories of creating systems and a quality product. Unfortunately it did not pay very much. Keep up the great work.

Thanks for the idea.

I can see many uses for this project... different gauge's of metal.... different measurements of the product.... thanks 😎 Nice video

I've been a fabricator for almost 30 years and these are so much fun to build but I've always just laid them out with a sharpie and straight edge

I always enjoy watching you tackle what seems like a near impossible build. And than you show the way and it looks doable, even for me. Where do you come up with such ideas every time? And I wish I could use my TIG welder as good as you weld. It is certainly not the welder's capabilities, it is all me... I realize this is an older video, but I had to comment. Thumbs Up!

my bro is the father you never had

Why did you cut it in half?

That’s a really clever process.

Very cool!

I think this is where something like 3D printing can really shine. adding your skill with sheet bending with a 3D printed mold would make for a super streamlined process.

genius

Ron you are the master of all masters bravo!!

I had the opportunity to work in a sheet metal shop for several years. My boss laid out square to rounds (for cotton gins) with math. He kept patterns for the common sizes but specialized pieces had to be laid out. I was always impressed that he could take dimensions over phone and have it perfect. I’d watch him and try to learn it but we didn’t do that enough when I didn’t have other work to do. Anyway. Awesome video on another way to do this.

I had to do flat pattern developments like these for a manual drafting class I took... except I did them by hand! By projecting dozens of lines and swinging arcs! Your method is much easier.

what if you need one at 20 feet diameter