Love this series! Did you ever finish it? Would really like to see the final project and how it performed for you.
@bigpoppavic
2 жыл бұрын
On pins and needles waiting for part 4 on this project
@GAJ3T
Жыл бұрын
Bisecting any chord of the circle would give you a line perpendicular to the chord as well as help you find the center. You can further bisect the circle with intersecting arcs, or additional chords; if you draw lines through the intersections... much faster than and more precise than trial and error expanding the compass/divider
@bcase2056
2 жыл бұрын
I'm ready for part 4
@DuluthMachineWorks
2 жыл бұрын
It’s coming!
@versus023
2 жыл бұрын
@@DuluthMachineWorks Wheres it is! im ready too!!
@edwardmcmurray9764
2 жыл бұрын
Really Great .
@DuluthMachineWorks
2 жыл бұрын
Thanks!
@CanadianTrini
2 жыл бұрын
You’re doing a really great job. As a suggestion bevel the ends of your tube. About half the thickness. This will ensure you get good penetration and help with the profile of the weld. Another suggestion is you could hire me to weld that for you 😉. Great craftsmanship guy. Looking forward to the next video. Be easy.
@DuluthMachineWorks
2 жыл бұрын
Thanks! I did bevel the tubes off camera, but somewhere along the line I lost a 1/16th of an inch somewhere and needed to grind them down flush. Definitely would have worked better though had the bevels still been there when I welded.
@CanadianTrini
2 жыл бұрын
I do have a question do both ends of your tubes have to be flush? Say the ash pan side. Does it have to be flush? Another option is beveling the hole in your plate especially if the the lower plate is thicker. It will take more heat. Maybe that would account for any differences in measurement? I really appreciate you taking the time to reply back. I don’t have a lot of craftsman in my neck of the woods to talk about these kinds of things with
@DuluthMachineWorks
2 жыл бұрын
The only reason I wanted the tubes flush is so it’ll be easier to clean soot and other buildup off of them, but it probably wouldn’t have made much of a difference and might have welded up better. If I was doing it all over again I’d definitely make sure that there were good bevels on the tubes or on the plate, and probably tig weld everything for better quality. Once I started getting the boiler tacked together and realized that it wasn’t a perfect fit, it kind of became a “better done than perfect” situation.
@CanadianTrini
2 жыл бұрын
Now that you mention the cleaning Im definitely interested in seeing this next video. Can’t wait guy.
@fryscountrylifechannel4437
Жыл бұрын
You should be teaching at a community college
@clivetucker176
2 жыл бұрын
Great video. Are you making more please? 🇬🇧
@DuluthMachineWorks
Жыл бұрын
More on the way! It’s been a crazy year but should be getting back in to it soon.
@Sugarsail1
2 жыл бұрын
yikes, "Only 30 psi" translates to about 2500 lbs of force trying to push that end plate out based on my surface area estimate. Most pressure vessels are designed with a factor of safety of 5 or more so those welds need to be able to hold about 12,500 lbs. I don't think I want to be anywhere near this thing when it's operational, probably wont fail catastrophically though, it'll just spray hot water on everyone which might be fun. Fire tube boilers flange the ends of the tubes, they don't rely on just welds, of course they run at 160psi too.
@DuluthMachineWorks
2 жыл бұрын
Hey, thanks for taking the time to comment and to run some calculations. You were pretty close to the number that I got for a back-of-the-envelope calculation, so it prompted me to run a simulation in Solidworks to see what my factor of safety would look like. What I found is that using estimated yield strength values for the steel and weld metal, I was well within a safety factor of 5x in all parts of the boiler core. I think the reason that this works out is that the 2,500lbs of force is not being exerted on each weld, rather, the load is being shared by the 13 fire tubes and the boiler shell. The whole simulation is a bit too long to write up in a KZitem comment, so I posted it over on the Duluth Machine Works website here: projects.duluthmachineworks.com/wood-fired-hot-tub-boiler-simulation.html. Feel free to take a look and tell me what you think. As far as failure modes, since there wouldn't be very much stored energy in the system due to the non-compressible nature of water, I bet you're right that a failure would look like a jet of hot water spraying from the failure point until the pressure equalizes. Since all of the welds in question will be inside either the firebox or smoke dome, a failure has "secondary containment" in a sense, making it hopefully unlikely that someone would get injured. I'm also going to do a hydrostatic pressure test up to 90psi (3x safety factor) before firing it for the first time. I do really appreciate your comment- it definitely got me thinking and pushed me to do a simulation that I should have done from the beginning. I'll also be talking through it in the next video, which will be covering the "Hot Tub Engineering".
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