How to cut miter like this??

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Hey guys been looking at some stainless welds at work, and some have amazing dime micro stacks but what im interest is in how do you get clean miter finishes like the pictures below? is there a specific way to weld then smoothing it out? im amazed how great they come up.... and tips and hints would be great...Also on a side note how do you cut a miter cut  so it goes bother ways? its hard to explain and i cant find a picture but when you look at a table for example you can clearly see the miter cut both length ways and width ways on the single vertical leg... Attached ImagesLast edited by nerdstar; 02-03-2012 at 03:00 AM.
Reply:If you want the bottom and back to be straight/no gap, you'll need to do two cuts. 45 in one direction than another 45 on a 90* from the original. For my money/time, I'd use a stop that way I'm only having to line it up once. than I just turn it 90 and it's good to go.There are no problems. There are only solutions. It's your duty to determine the right one.Hobart Handler 210Airco 225 Amp MSM Stinger
Reply:Cold saw.Tim Beeker.
Reply:On the miters. I have found that the best we to get proper miter joints with stainless is this: cut as close as you can, usually with an abrasive or band saw, then finish the end with a disc sander and miter gauge. Cold saws work pretty well, but not on thin material. Most stainless work is really thin because of the high cost of the material.On the pretty corners. That's all in the finishing. First the majority of the surface finish is usually applied by an automated belt sanding machine to the raw stock. Then the joint in your picture was cut, welded, the weld ground flush, and then the surface finish was re-applied. Most of the second op surface finishing is done with a hand held sanding drum, and the tight corner finish is done by hand with a scotchbrite pad. Don't be fooled by this short explanation though, it's a lot of work, by skill hands.Ian TannerKawasaki KX450 and many other fine tools
Reply:For that miter look of the finished surface you will use a burnishing machine. After one leg of the angle is finished, the miter will be covered with 3M UHMW Film Tape (expensive!).http://solutions.3m.com/wps/portal/3...beDHSN6BF1M1glThen you do the other leg. When the tape is removed you get a sharp miter line in the surface.
Reply:Hey nerdstar,Like this?????Denny Attached ImagesComplete Welding/Machine/Fab. ShopMobile UnitFinally retired*Moderator*"A man's word is his honor...without honor there is nothing.""Words are like bullets.... Once they leave your muzzle, you cannot get them back."
Reply:Originally Posted by tnjindCold saw.
Reply:Hey Denny. I think he's talking about a miter joint where all 3 intersecting pieces all have the miter, not just 2 like you showed. I believe Thor has the right picture. You would have had to rotate the piece 90 deg after cutting the 1st miter to cut the 2nd one on each piece.I never thought about the fact it might simply be a finishing process like fortyonethirty suggests. Makes sense however, sand it smooth and then reproduce the "grain" in the right direction up to a "cut" line..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:That is all finishing technique, nothing else. They may not even have miters underneath that, once it is welded and ground you can't tell. I have used that technique on SS tubing on a door. Usually I sand in one direction, lay tape across the 45 and sand in the other up to the tape line. You have to hand sand up to the line and it takes a bit of time.
Reply:nerdstar  -  Walker broke the code; if the side is finished [brushed] like the front it's smoke and mirrors.  This is a standard finishing technique.  I use stainless steel shim stock for the mask because it maintains an edge. Opus
Reply:We do SS tube like that. Cold saw works excellently on thin wall tube, you just have to use the correct blade. If it is what I think it is in the pics, its pre-finished in line scratch pattern SS tube. Then it is a tight fit 90 degree miter that has been welded autogenously. If the miter is a good fit just run the tig torch tight with no filler. Then hit it with a fine ss wire brush and you wont even see the weld. If you can TIG weld SS thin wall tube autogenously. It is very easy. Ill try to find some pics.Last edited by Capozzoli; 02-05-2012 at 10:06 PM.Welding everything, from the crack of dawn to a broken heart.
Reply:Hey thanks guys with all the info, DSW you right i meant the 3 section pieces, ill give it a crack when i setup my saw later this week and ill post pictures of my attempts, and Walker and OPUS, you guys have made me notice this. I was in a sushi shop yesterday and i saw clearly that the welds have been just butted together and not mitered..... Cheeky people just making it for aesthetic purposes lol
Reply:Originally Posted by CapozzoliWe do SS tube like that. Cold saw works excellently on thin wall tube, you just have to use the correct blade. If it is what I think it is in the pics, its pre-finished in line scratch pattern SS tube. Then it is a tight fit 90 degree miter that has been welded autogenously. If the miter is a good fit just run the tig torch tight with no filler. Then hit it with a fine ss wire brush and you wont even see the weld. If you can TIG weld SS thin wall tube autogenously. It is very easy. Ill try to find some pics.
Reply:Originally Posted by nerdstarAlso on a side note how do you cut a miter cut  so it goes bother ways? its hard to explain and i cant find a picture but when you look at a table for example you can clearly see the miter cut both length ways and width ways on the single vertical leg...