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Old 10-18-2012, 12:19 AM   #1
fork
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Yup I'm building a stainless conical fermenter from a keg. No special tools needed, I'm farming out the welding but we will get to that. First calculate the cone, I like to worked out the math so the arc was exactly 180 degrees and let the cone angle fall where it may. I cut it out with one of my favorite tools, a 4-1/2 inch angle grinder. The small radius was very tricky to cut and not perfect, but it must be cut out or you can't bend the cone.

So the internet would tell you that you need a slip roller to roll sheet metal and even with one, a cone is difficult, but lets make our own. Take two pieces or round bar or tubing, I used 1/2 inch because thats what I had, but 1.5 or 2 would probably be better. Grind a two small flats on each end of each bar 180 degrees apart. Now place on the bench a washer, one bar, another washer, the other bar and clamp. The thickness of the middle washer should give you a gap between the bars slightly larger than thickness of the material.

Next draw a bunch of radial lines on the cone (you want them facing up) and gradually work the sheet metal into a cone.


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Old 10-18-2012, 12:21 AM   #2
fork
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I guess that it for the cone, took me about an hour and a half. I cut the bottom off a keg, and cut a hole for a 4 inch tri clamp in the top and had it welded by someone who claimed they could do sanitary welding, but could not. So right now it is off at the second welder to have some things fixed. I should get it back end of next week, more pictures to follow.


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Old 10-18-2012, 01:44 AM   #3
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Old 10-18-2012, 03:05 AM   #4
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Wow! Great handiwork.

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Old 10-18-2012, 03:14 AM   #5
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Definitely a very interesting thread. Without a video, it's tough for me to fill in some of the gaps. What gauge SS is that, and how do you "work" it? Do you just hand bend the metal close to the two bars? If you grab the sheet metal too far from the bars, does it bend in the wrong place? I imagine you just bend a little at a time, and keep working around the circle, but it looks like it'd be hard to get a hammer in there? Is the purpose of the radial lines just to ensure that all bends are in the same "plane"? What issues did you have with the welds, and how did you know they weren't good enough?

I guess for me, sometimes a picture "requires a thousand words"?

Looking forward to seeing how this turns out.
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Old 10-18-2012, 11:48 AM   #6
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COOL! subscribed.

 
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Old 10-18-2012, 11:53 AM   #7
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Subscribed as well. Would love to see more of the process of setting up the roller.

 
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Old 10-19-2012, 01:16 PM   #8
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Also, What gauge stainless are you using?


Thanks

 
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Old 10-19-2012, 03:40 PM   #9
fork
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The lines are so you can make all the bends radial out for the center. There was no hammering involved, just bending the the metal gradually pushing up against the top bar. I'm not sure what guage sheet metal I would say 18 if I had to guess I may be able to measure it later

 
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Old 10-19-2012, 06:55 PM   #10
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Very nice, subscribed.



 
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