/diy/ - Do It Yourself

Throw it away, buy a proper one

>>1595287
You can guess that this isn't the answer I'm looking for

I've been thinking about jamming a circular piece of wood the same perimeter as the tube and hammering the side with one of those steel flattening hammer, would this work ?

>>1595292
>would this work ?

No.

The only way to correctly make a round tube from sheet material is to roll it.

Why, what are you using this for? Could be X-Y problem

if it's merely for aesthetic, go and buy one that is round
if you are doing it to save money, why give a fuck about it being round? has more soul like that

>>1595299
/thread

You could also build a makeshift slip roll from 3 3/4 or 1 inch steel water pipes and wood, your sheet metal looks thin enough that you could probably just do power it with your hands.

>>1595301
It's meant to be a tube for a fan, and I want the Gap between the propeller and tube as small as possible

>>1595334

what sort of fan? a gap of 0.001 and a gap of 1/2 inch won't make much difference with an ordinary fan.

>>1595353
Any money he's trying to build a ducted fan. This is going to be a ride.

>>1595356
You guessed it

I know I'm most likely going to fail, and that I suck at it, but at least I'm not sitting in front of my computer

There's not much you can do to it now. It looks like you got a little violent with it. You must be gentle with your flat sheet and it will look better. Start over. New material roll it around pvc pipe or something
There is nothing you can do to save this one though

>>1595388
I actually used a gutter pipe, and yeah it was messy, I'm probably going to buy a proper tube, but I don't actually know where to buy one

>>1595391
You can buy stovepipe or round duct pipe of various diameters at a hardware store.

>>1595334
If it only has to be round at the fan, find some sort of steel ring that will fit inside the tube. Even better, integrate that ring into the fan mount.

HVAC ducting

>>1595285
i get pretty good results with a hammer and a vice. Weld the seam and then keep beating it.

>>1595285
just keep working it with your hands and it will be close. That flat spot where the bolts are and you have double-thickness is going to give you trouble, you probably have to take it apart and get both sides started with pliers or a vise or some boards clamped like a brake, but you run into the same issue with rolling like >>1595299. The workpiece leaves the roll in the last half inch or so and you end up with a little straight piece. If it needs to be perfect, roll it with extra on both ends and cut off the excess, then butt weld and grind off the excess, it's how ERW tubing is made.

https://youtube.com/watch?v=llhcATrmsBg

Get rid of the bolts. Cut the thing in half lengthwise, then flatten it and weld the sides together. After that attach a hose fitting and pump high pressure water to inflate the tube. Cut off the ends and clean up when done.

Why keep telling him to weld it. That shit is paper thin and he already said he's new.

>>1595434
>>1595494

I'm pretty sure that theorically if I work long enough on beating it I can get it round, it must just take an impractically long time to do so

>>1595752
I do have a welder, but since I'm a noob I figured the weld might be weaker and break off eventually

>>1595752
spot welder is what you need

the $110 one from harbor freight works okay as long as it isn't aluminum you're welding and you hold the tongs to the work long enough for the tips to cool down before moving on