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Old 12-26-2008, 07:40 PM   #1
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Default new approach => pyramidal instead conical Fermenter

Hi@all,
after a brief and long search along several forums and boards on homebrewing, I decided to become a member here which seems to be the most competent..!!!

Well, I want to upgrade my equipment with two new fermenter, but these are dammed expensive here in Europe (80Liters for just 1700 Euro). So I decided to build them on my own.

But it seems o be rather difficult to weld a conical fermenter. I.e. to hold everything in place while welding. Today I had also done a search on grain mills, and because of them I came across my new new idea. Okay, it seems to be new, because I didn't find something like my idea on the web. But it is possible that this idea will just waste money, so I need your comments

It is no big problem to weld along a straight line, so why don't use straight lines on a fermenter - so I got the idea to use a pyramidal design instead a conical...


I had drawn to views from the top, the right one has a square plae as bottom, so it is easier to install a valve...


What do you think about that idea...????


About a stand and the lid I really love the Yuri's idea in his DIY Conical Fermenter thread.


kind regards from Bavaria
Steve

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Old 12-26-2008, 09:53 PM   #2
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I LIKE IT ! It's problem solving like this that sets us apart from the apes.

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Old 12-26-2008, 09:54 PM   #3
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I've been considering the idea as well. I think it should work fine. You will want to have the welds very smooth in those corners. You will also want to make the design so that it's actually feasible to weld it; keeping the height to width ratio to something easy to work with in the building process... as well as the cleaning task.

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Old 12-27-2008, 02:08 PM   #4
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I think the only advantage of a conical as opposed to your design would be the crevices of your bends/joints- just make sure you clean/sanitize it well and I think you have a winner!

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Old 12-27-2008, 03:37 PM   #5
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how do you plan on cleaning/ grinding the corner welds? That's part of the reason we use a conical shape, no places for nasty buggers to hide in welds we couldn't grind smooth.

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Old 12-28-2008, 03:55 AM   #6
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Also this requires a lot more welding. With the conical design you have the seem of the cone (if you are making it entirely from sheets) and the seem of the cylinder and the joint where they meet. The square design has ~4 times that. The welding on the cylindro-conical should be easier too. You're basically doing flat welds except for the joint between the cone and cylinder. With the square design you have a bunch of 90˚ welds.
Then there is the difficulty of the dump valve, square hole, round peg.
What kind of welding would you use? It should be easy enough (meaning, not impossible) to set up the metal for welding with aluminum tape and c-clamps. You should even consider making a wooden jig to hold it all in place while you tack it together.

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Old 12-28-2008, 03:47 PM   #7
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You can do it with 1 weld, and the weld to attach it to rest- Could even be less welds if you have a large piece of material to work with; once top of the 'cone' attached to main portion, the rest of the cone one piece attached to that so that you can bend the four edges, tack the one side, and then tack the other three edges to the main vessel. Four weld lines- Just takes some planning.

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Old 12-29-2008, 04:35 AM   #8
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If you made it out of a single sheet of metal, you could plan to make 3 full sides and two half sides on the ends. After bending and bringing the shape together, the weld will occur along a flat face, rather than in a corner. Easier to weld and grind.

Cheers

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Old 12-30-2008, 04:44 PM   #9
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Hi,
sorry for the delay, but as you all know at this time of the year lots of partys have to be solved

Thank you for your suggestions. Well, you are right that my design require much more welding, even if I use one singe sheet which is bent into place, but the corners of the pyramidal section will still require lots of welding.

I also had found a nice tutorial on a conical fermenter out there in the web ( How to Build a Conical Fermentor Cheap ) but I still worry to bend the metal into the circles, if the metal is stressed while welding, I'm really sure it won't be tight. I don't have access to bending-rollers to bend it into place, that it will hold its shape without to be stressed...

bye
Steve

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Old 06-01-2009, 03:31 PM   #10
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Quote:
Originally Posted by Seabee John View Post
how do you plan on cleaning/ grinding the corner welds? That's part of the reason we use a conical shape, no places for nasty buggers to hide in welds we couldn't grind smooth.



From a welders perspective, you wouldnt grind or clean the inside welds, and the reason is, it depends on how you weld it up. Now, if you were frabricate all four sides, and your tolerances were tight, and your fittup was tight, you could fuse weld the outside corners moving your tig torch in really tight circles no bigger than 1/8", using no filler, just fusing the corners. What this does is create a very smoothe and seamless inside seam, that would be so smooth, that it would look like the fermenter was made out of one piece. I've done fuse welds like this, time and time again, but on a project like this, I dont recommend the first time tig welder try, or at least do a crap load of practice sample before you tackle the real project.
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