Open Source Ecology Heat Exchange Coil Winding, 2 Feb 2012

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From YouTube: Helical coils

Description

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A

Precise distances between here.

B

Oh so you're going to, I see so you're going to have a rod.

B

A

You have a ball screw yeah the handle.

A

And we just well.

B

That's acme, that's uh acne,.

A

B

Uh-Huh uh-huh so now by turning it.

A

Now, by turning.

B

You get precise motion.

A

There now uh-huh, when you figure the distance from center to center, that you want. You notice, there's a mark about every eighth of a there's. There's eight one, two three four there's eight marks on the table so that.

B

A

It up symmetrically, so you figure out this distance and how many turns per revolution to get that distance. That's how many times you turn this. So every eighth of a turn. Let's say you wanted to go. uh You wanted. Let's say you wanted to double that.

A

um So you'd want to turn this 16 times every revolution. You'd come down here and you'd make another mark and you'd have 16 marks on the table and every time one of those marks hit here you turn it once okay, then you turn it. You know, then, when the next one comes, you turn it again and the next mark comes. You do another turn and another turn yeah. So you just figure out how many turns per revolution you want. You make that many marks on the table.

B

A

And that gives you your distance here.

B

A

Now we have, we do. You can also wind up coils like this, but with them tight together, yeah.

B

A

Then you don't need this ball screw you just this just follows it up, so you start at the bottom and work your way up, and this will. This will um just follow it naturally, because of the the the frictional and torsional forces.

A

And that's what he on his wood-fired dune buggy. We have.

A

About three feet: three feet of half inch, tubing, wound and.

B

A

Coils one right on top of the other, this.

B

Is three eighths right here.

A

B

This is the quarter.

A

B

Schedule 40 yep.

A

Black pipe yep and what they did. What we did is we're copying this off boiler over here.

A

Yeah, but we're doing it on a much smaller scale. Uh-Huh. There are two three people that have um come and wound.

A

30 sets there's a right and a left because you have to have a this is a right. You have to have a left to fit inside here.

B

So you can start the the coil winder in either direction. Yep.

B

Do you actually spin.

A

The motor in a different way, or do you just three-way hydraulic valve and.

B

A

Will turn clockwise or counterclockwise, and then you just turn you just turn this upside down or right.

B

A

Up, depending on which way you want to line.

B

Uh-Huh, okay, so this would be this handle to this side or handle to this.

A

Side to that side.

B

Yeah excellent, so you've got um precision. Is this person just regular acme.

A

They're, just it's a ball screw and nut they're acme threads.

B

Okay, so measurements are so. The acme is about what 31 inches or 30 in 31 inches or so.

A

B

Uh-Huh, so you've got this little plate with a little tube.

A

There's just a socket for the tube.

B

A

B

And the acme: that's three quarters.

A

Yeah, that's like three-quarter shaft, three-quarter,.

B

Shaft and once again here, you've got.

A

It's just another hollow piece of tubing, yeah welded to that plate.

B

Uh-Huh- and this is here- it's you got it.

A

B

Why is this extending this way so much.

A

uh In case it gets jammed in here, you have something that you can hit with a hammer or knock it out.

B

A

B

A

Use I mean you could have used quarter inch plate on this.

A

This was something that I I put this together in about two hours, because the guy, the guy phoned tom and said I'm on my way to to wind these coils. Well, we haven't made this setup yet uh-huh yeah.

B

A

uh So we had to uh hurry up and put something together.

B

A

So this is what we came up with.

B

Okay, see, let's get a measurement on the handle here, so the handle it's a little square about ten and three eighths a little piece of square tube. This this handle rolls handles, got what a three-eighths it's like, four and a half and there's a three-eighths.

A

B

Bolt and how do you hold it on top.

A

And just cut the head off, or uh I turned the head down and laid here- let's get this out of here and you can get a better look at it. Just turn the head down and lathe.

A

And uh this is actually a thicker.

B

Oh yeah, so you turn.

A

It off so I just I bored this out so that it's a little bit a little bit bigger hole than that and then.

B

A

Then turn the head down the head of the bolt down to fit inside there, yeah okay, a little handle okay, and it's all just simple these. All these welds were done with the wire welder. Why is this? uh What's.

B

This, the strengthening.

A

Gusset but it's not welded to no.

B

A

Not welded to the ball screw.

B

Strengthening for what, for this.

A

Just for the handle, so the handle doesn't bend down.

B

Okay, so it's just physically touching against that yeah.

A

It's just touching against there.

B

Okay, uh-huh, okay, that sounds good and then the handle here does this have to be strong or is.

A

This handle it should be um because.

B

A

This with the torch and then just bent that, because, if you have it straight out, you got your tubing straight out here too you're gonna end up scraping your knuckles. So that's why it's at an angle.

B

So you don't hold this fixed, you just hold it by hand.

A

You hold this by hand.

B

Once you'll just.

A

Lock it down well because, as your coil gets bigger, this turns out. Oh.

B

A

So you can't lock it in place. Okay,.

B

Okay, yeah, so that's what is that, like a one inch.

A

Or three quarter quarters.

B

Three quarter: three.

A

Quarter: seven eight.

B

It's more like um seven eighths, solid yeah.

A

Just something that we had on the shelf by like 17.

B

About 20 inches long, okay, yeah, and what is this last piece here? What is this last.

A

Station that was part of the original construction.

A

hm Well, that's been tucked away somewhere.