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Bend Deduction formula: The bend deduction formula has tan(A/2), and as the interior angle approaches zero, A approaches 180 degrees(=pi), tan(A/2) approaches infinity. Clearly this is not physically reasonable. The formula works well for angles near a right angle. The formula might pertain to the apex in the diagram, which would grow to infinity as the sheet metal is bent over double. Could the formula for bend deduction be R(A-2)+T(k*A-2), where A is the exterior angle in radians (=degrees*pi/180) which works for exterior angle 90 degrees and greater bends. For bend angles less than 90 degrees exterior angle, bend deduction would depend on where one measures from in the bend. Typically one will measure from the middle of the bend, in which case the bend deduction is negligable. Great article, I find the information useful. Pmayer05 ( talk) 16:49, 27 November 2012 (UTC)
Although the article is rather brief, I would like to compliment the editor who added that animated image of bending! I like that! I think Wikipedia has some good animated maps and I really would like to see more of these sorts of things as they add a certain flair to this website. Best, -- Le Grand Roi des Citrouilles Tally-ho! 18:42, 11 July 2007 (UTC)
I wish the animation would stop after a few cycles - can that be done? Wilhkar ( talk) 16:39, 6 February 2010 (UTC)wilhkar
I believe it can, but it'll increase the file size, how many times do you want it to cycle? The more cycles, the bigger the file. It doesn't bother me the way it is. Dissymmetry ( talk) 17:51, 8 February 2010 (UTC)
I would like to see a table for the different K factors for aluminum and steel based on standard stock sizes. I found some useful information on this (see below). There could be different tables based on the different bending methods.
That illustration shown in the section on joggling is misleading, because of the colouring of the tool and metal material, when enlarged the illustration is discernible, but it would be more clear to the novice if a side view of a joggle were shown. When viewed side on, it is in fact a double bend a little like a Z, but not as acute an angle in the double bends. 13:05, 27 November 2012 101.171.170.169 (talk)
[1] [2] -- Noelstalker ( talk) 19:47, 11 August 2009 (UTC)
This is an old request, but it has been fulfilled. Dissymmetry ( talk) 22:42, 5 February 2010 (UTC)
I just finished re-writing this page, sorry I do not have sources for the information as my experience is the source and where I got my original input information is lost in the sands of time. Dissymmetry ( talk) 22:45, 5 February 2010 (UTC)
Because the process and the equipment are so tightly linked, this article and the one on press brakes need to be better integrated so as to not cause duplication. Wilhkar ( talk) 16:38, 6 February 2010 (UTC)wilhkar
I do not believe these sections are giving any useful information. I have seen materials up to 2" formed on a press brake, yes I know rediculous but true. Regardless, I think they should be either expanded greatly or removed altogether. Dissymmetry ( talk) 18:07, 8 February 2010 (UTC)
History item: 16:17, 8 February 2010 Wilhkar (talk | contribs) (14,801 bytes) (→Bottoming: Replaced description with one that can include source citation. Is line spacing off? it is in the preview but I don't know how to change it.) (undo)
I didn't care for the citation used, I found it difficult to follow, can it be merged with what we already had and cited as summary rather than direct quote? I understand the need for citations, but I think it is better to put them in our own words unless it can't be said any better than their exact quotation. I have no problem with attributing something that is 90% my own to someone else's citation as long as they are in agreement. Additionally the changes to the definitions have eliminated the simple cohesion between them that made them each easily understood in comparison to one another ... Everywhere else we are using T for thickness, I think we should stick with that. Also if I am understanding the description correctly some of it sounds more like Air Bending than Bottoming? Dissymmetry ( talk) 18:24, 8 February 2010 (UTC)
Just FYI: http://www.thefabricator.com/article/bending/bend-deduction-charts Wizard191 ( talk) 19:06, 24 February 2010 (UTC)
The diagrams associated with the Bending Allowance and Bend Deduction paragraphs show "t" (distance from the inside face to the Neutral Line) as being measured from the "outside" bend surface, vs. the "inside" bend surface as correctly defined in previous text. —Preceding unsigned comment added by 97.115.166.20 ( talk) 18:38, 14 October 2010 (UTC)
This still looks wrong/confusing to me. The neutral line looks like it's closer to the outside edge, about 0.66 from the inner edge, yet the values in the table are more like 0.33 - does this mean the diagram is wrong, or maybe small "t" should be from the outside? Since I'm not knowledgeable about this subject and using this to learn from, it's not really clear which is right. Having come to this talk page and seen the comment above, I now suspect it's the diagram that's wrong. However, that's based on the anonymous input of one person with unknown expertise/knowledge in this area, so I'm still unsure as to which is correct. JayAbbott ( talk) 14:19, 23 April 2015 (UTC)
Description of joggle bending wasn't enough for me to visualize it. Nice photo of the tool, tho... Cgmusselman ( talk) 08:22, 24 November 2010 (UTC)
I consider that laser forming should be included in this section as a new technique to achieve sheet bending and I aim the authors to contribute. More info and references could be found in the following links: http://www.iaeng.org/publication/IMECS2013/IMECS2013_pp834-839.pdf http://www.liv.ac.uk/~me0u5040/forming1.html http://www.newcraftfuturevoices.com/module/view-submissions/abstract/207/ — Preceding unsigned comment added by 47.60.88.138 ( talk) 22:14, 28 January 2015 (UTC)
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As with many other industrial technology articles, this article focuses far too much on one specific method, the dominant method preferred by industry today. Press brakes are but one of several metal bending tools, and many others remain in widespread use. Classical sheet metal brakes should certainly be included, both the heavy type found in machine shops and the lighter variety used by gutter and HVAC work, not to mention hand brakes that resemble a pair of broad jawed pliers (some with vice-grip handles) that are widely used for joining HVAC ductwork. Douglas W. Jones ( talk) 19:54, 9 November 2017 (UTC)
This
level-5 vital article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||
|
Bend Deduction formula: The bend deduction formula has tan(A/2), and as the interior angle approaches zero, A approaches 180 degrees(=pi), tan(A/2) approaches infinity. Clearly this is not physically reasonable. The formula works well for angles near a right angle. The formula might pertain to the apex in the diagram, which would grow to infinity as the sheet metal is bent over double. Could the formula for bend deduction be R(A-2)+T(k*A-2), where A is the exterior angle in radians (=degrees*pi/180) which works for exterior angle 90 degrees and greater bends. For bend angles less than 90 degrees exterior angle, bend deduction would depend on where one measures from in the bend. Typically one will measure from the middle of the bend, in which case the bend deduction is negligable. Great article, I find the information useful. Pmayer05 ( talk) 16:49, 27 November 2012 (UTC)
Although the article is rather brief, I would like to compliment the editor who added that animated image of bending! I like that! I think Wikipedia has some good animated maps and I really would like to see more of these sorts of things as they add a certain flair to this website. Best, -- Le Grand Roi des Citrouilles Tally-ho! 18:42, 11 July 2007 (UTC)
I wish the animation would stop after a few cycles - can that be done? Wilhkar ( talk) 16:39, 6 February 2010 (UTC)wilhkar
I believe it can, but it'll increase the file size, how many times do you want it to cycle? The more cycles, the bigger the file. It doesn't bother me the way it is. Dissymmetry ( talk) 17:51, 8 February 2010 (UTC)
I would like to see a table for the different K factors for aluminum and steel based on standard stock sizes. I found some useful information on this (see below). There could be different tables based on the different bending methods.
That illustration shown in the section on joggling is misleading, because of the colouring of the tool and metal material, when enlarged the illustration is discernible, but it would be more clear to the novice if a side view of a joggle were shown. When viewed side on, it is in fact a double bend a little like a Z, but not as acute an angle in the double bends. 13:05, 27 November 2012 101.171.170.169 (talk)
[1] [2] -- Noelstalker ( talk) 19:47, 11 August 2009 (UTC)
This is an old request, but it has been fulfilled. Dissymmetry ( talk) 22:42, 5 February 2010 (UTC)
I just finished re-writing this page, sorry I do not have sources for the information as my experience is the source and where I got my original input information is lost in the sands of time. Dissymmetry ( talk) 22:45, 5 February 2010 (UTC)
Because the process and the equipment are so tightly linked, this article and the one on press brakes need to be better integrated so as to not cause duplication. Wilhkar ( talk) 16:38, 6 February 2010 (UTC)wilhkar
I do not believe these sections are giving any useful information. I have seen materials up to 2" formed on a press brake, yes I know rediculous but true. Regardless, I think they should be either expanded greatly or removed altogether. Dissymmetry ( talk) 18:07, 8 February 2010 (UTC)
History item: 16:17, 8 February 2010 Wilhkar (talk | contribs) (14,801 bytes) (→Bottoming: Replaced description with one that can include source citation. Is line spacing off? it is in the preview but I don't know how to change it.) (undo)
I didn't care for the citation used, I found it difficult to follow, can it be merged with what we already had and cited as summary rather than direct quote? I understand the need for citations, but I think it is better to put them in our own words unless it can't be said any better than their exact quotation. I have no problem with attributing something that is 90% my own to someone else's citation as long as they are in agreement. Additionally the changes to the definitions have eliminated the simple cohesion between them that made them each easily understood in comparison to one another ... Everywhere else we are using T for thickness, I think we should stick with that. Also if I am understanding the description correctly some of it sounds more like Air Bending than Bottoming? Dissymmetry ( talk) 18:24, 8 February 2010 (UTC)
Just FYI: http://www.thefabricator.com/article/bending/bend-deduction-charts Wizard191 ( talk) 19:06, 24 February 2010 (UTC)
The diagrams associated with the Bending Allowance and Bend Deduction paragraphs show "t" (distance from the inside face to the Neutral Line) as being measured from the "outside" bend surface, vs. the "inside" bend surface as correctly defined in previous text. —Preceding unsigned comment added by 97.115.166.20 ( talk) 18:38, 14 October 2010 (UTC)
This still looks wrong/confusing to me. The neutral line looks like it's closer to the outside edge, about 0.66 from the inner edge, yet the values in the table are more like 0.33 - does this mean the diagram is wrong, or maybe small "t" should be from the outside? Since I'm not knowledgeable about this subject and using this to learn from, it's not really clear which is right. Having come to this talk page and seen the comment above, I now suspect it's the diagram that's wrong. However, that's based on the anonymous input of one person with unknown expertise/knowledge in this area, so I'm still unsure as to which is correct. JayAbbott ( talk) 14:19, 23 April 2015 (UTC)
Description of joggle bending wasn't enough for me to visualize it. Nice photo of the tool, tho... Cgmusselman ( talk) 08:22, 24 November 2010 (UTC)
I consider that laser forming should be included in this section as a new technique to achieve sheet bending and I aim the authors to contribute. More info and references could be found in the following links: http://www.iaeng.org/publication/IMECS2013/IMECS2013_pp834-839.pdf http://www.liv.ac.uk/~me0u5040/forming1.html http://www.newcraftfuturevoices.com/module/view-submissions/abstract/207/ — Preceding unsigned comment added by 47.60.88.138 ( talk) 22:14, 28 January 2015 (UTC)
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Cheers.— InternetArchiveBot ( Report bug) 00:13, 18 July 2017 (UTC)
As with many other industrial technology articles, this article focuses far too much on one specific method, the dominant method preferred by industry today. Press brakes are but one of several metal bending tools, and many others remain in widespread use. Classical sheet metal brakes should certainly be included, both the heavy type found in machine shops and the lighter variety used by gutter and HVAC work, not to mention hand brakes that resemble a pair of broad jawed pliers (some with vice-grip handles) that are widely used for joining HVAC ductwork. Douglas W. Jones ( talk) 19:54, 9 November 2017 (UTC)