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  #1  
Old 07-22-2014, 12:57 PM
kenuto kenuto is offline
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Default Making a round corner

Patterns-For-Buoy-Plates-339.jpgI would like to make this corner, in one piece, minus the rivets of course. Is there a formula and is there a correct label/name for this type of corner?
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Last edited by route56wingnut; 07-22-2014 at 01:36 PM.
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Old 07-22-2014, 02:43 PM
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Ben Ben is offline
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Hi Kenny,

i made a corner like that a couple of months ago fro a desk that is in my daughters shop www.wickedwigsshop.com


I made a flexible pattern on a ball of the correct size.

Cut out 1/8 and added the sides wher the rivets shoul go.

Hope this helps

Ben
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Old 07-22-2014, 08:48 PM
mark g mark g is offline
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http://chestofbooks.com/crafts/metal...l#.U88TjsJOXmQ
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Old 07-22-2014, 09:03 PM
kenuto kenuto is offline
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I would like it to be one whole piece not two, I have seen it done but I don't know how they got there.
I will continue to search...
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Old 07-22-2014, 09:26 PM
Irrational Metalworks Irrational Metalworks is offline
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Maybe the easiest way for you would be to make a hammerform with the desired radius, and shape it over that. There is lots of hammerform info here on this site.
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Old 07-23-2014, 12:41 AM
metalman sweden metalman sweden is offline
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Hi!
When I have done this corners I have made a simple " buck " of cardboard with 3 pie shaped stations with the correct shape, then I just glued this ones to a base plate.

A paper pattern is them created for the cut out, the fit will be checked over the buck.

If the first one then come out the way you like it you can make a flexible pattern to copie it exact.

If some already exist, Bens way would be my choice.

Hope to see your solution!
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Old 07-23-2014, 07:11 AM
Oldnek Oldnek is offline
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It's called a Tri- Corner or 1/8 of a Sphere and If you do it right it should be symmetrical. Maybe you would have to work it out at 1/4 radius x pie-r2 + the size of you flange.
I haven't worked out how to do yet, but I will have a go at it tomorrow..another challenge! Why not.
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Old 07-23-2014, 07:43 AM
route56wingnut route56wingnut is offline
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These are done making tanks as I have seen .There is a mathematical formula that is beyond my pay grade to do this . You are bending with a correct radius brake and there is a cut you do at the intersection that I am not remembering that will allow the corner to come together and weld up .

I did one and made a corner hamer form out of duraglass that allowed me to correctly get the corner laid into shape .
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Old 07-23-2014, 08:15 AM
flebus flebus is offline
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The math is easy. As mentioned the corner is a 1/8 section of a sphere. The radius of the sphere is exactly the same as the radius of the rounded 'fillet' or curved section of the side pieces. The edges of the corner are exactly the same arc length as the edge of the fillet.
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Old 07-25-2014, 09:28 PM
kenuto kenuto is offline
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Default I found what I was looking for

round corner .jpg

round corner -1.jpgOis is what I was trying to explain, I found it in "Short Cuts for Round Layouts" I should post this somewhere as a pdf. A really useful aesthetic, I think. I hope some one else finds this useful as well.
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Last edited by route56wingnut; 07-25-2014 at 09:36 PM.
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