Is there a book that you are working from that discusses this in greater detail. So far, this is the best explanation I've seen on this subject and I have searched the internet far and wide. No one else goes through it step by step like you do. Big thanks!
@@dart70ca Circumference of the circle on the neutral axis . So a 90 degree bend would be a quarter of the circumference of the circle , as 90 / 360 = 0.25 . I hope this clarifies it for you .
I'm wondering. According to the result length versus the total of the panels length, wouldn't it be easier to subtract 2x thickness for a 90 degrees bend and 1x the thickness for a 45 degrees bend?
Its hard to put in words but easy for .5 k factor. So I’m going to go into depth, and I hope it helps someone. This is the best video I’ve found. When he says radius, he means radius plus k factor. K factor is almost always .4 to .5 for steel and aluminum. So he just took half of his material thickness being.( .5 = K factor). He then added that to the bend radius to get his “R” it’s really this!!!!!……….. material thickness x the K factor x 2 x pi x the angle of bend divided by 360 ……… that’s the equation if not an easy .5 k factor. (K factor changes on the type of metal you are bending) there are easy google charts if you know what you are bending. There are also calculators but learn this first!
I think that the figures calculated are with a neutral axis in the centre of the material so that the stretch and shrinkage are equal in this case . To make a more realistic bend allowance formula requires the formula BA= AxPi/180 x( R + KT ) Where BA = Bend Allowance A = angle of bend in degrees R = Internal radius of bend ( found from bending tool ) K = K Factor , which is found empirically ( By trial and error ) Or from Westinghouse tables T = Material thickness . So I think that this is a start to find the allowances but will be inaccurate as the K factor varies .
Is there a book that you are working from that discusses this in greater detail. So far, this is the best explanation I've seen on this subject and I have searched the internet far and wide. No one else goes through it step by step like you do. Big thanks!
Thanks for sharing this my friend! I learned more in these couple minutes then I did in three hours taking notes and reading
Dude, love the mentioning on the aluminum shrinking. It’s not often I see that mentioned on the internet.
Nice breakdown in actual practice. Thanks man!
This was of great help... thanks .. keep it up ...
Nice video and explanation.
Thank you.
Great video!
Good job!
Thank you very much
could you make a video on complex sheet metal design development length calculation ?? Thank you
Very good. One way to simplify is circumference divided by 360 times the bend angle in degrees.
Circumference of what?
@@dart70ca Circumference of the circle on the neutral axis . So a 90 degree bend would be a quarter of the circumference of the circle , as 90 / 360 = 0.25 . I hope this clarifies it for you .
I'm wondering. According to the result length versus the total of the panels length, wouldn't it be easier to subtract 2x thickness for a 90 degrees bend and 1x the thickness for a 45 degrees bend?
That works well for 90 deg bends but not as well for other angles.
Yeah that doesn’t work if you have quality control and tolerances. You need to actually do the math.
So you don't have to factor in bend deduction?
Edit* I see now ...you are figuring from the neutral axis where no stretch occurs.
where does 3/8 on the radius come from?
Its hard to put in words but easy for .5 k factor. So I’m going to go into depth, and I hope it helps someone. This is the best video I’ve found. When he says radius, he means radius plus k factor. K factor is almost always .4 to .5 for steel and aluminum. So he just took half of his material thickness being.( .5 = K factor). He then added that to the bend radius to get his “R” it’s really this!!!!!……….. material thickness x the K factor x 2 x pi x the angle of bend divided by 360 ……… that’s the equation if not an easy .5 k factor. (K factor changes on the type of metal you are bending) there are easy google charts if you know what you are bending. There are also calculators but learn this first!
Hi sir I'm from India🇮🇳 (ahmedabad city) I need to all type of sheet bending topics..
How to contacts you
K factor, yo. This math is BS classroom work
I think that the figures calculated are with a neutral axis in the centre of the material so that the stretch and shrinkage are equal in this case .
To make a more realistic bend allowance formula requires the formula BA= AxPi/180 x( R + KT )
Where BA = Bend Allowance
A = angle of bend in degrees
R = Internal radius of bend ( found from bending tool )
K = K Factor , which is found empirically ( By trial and error ) Or from Westinghouse tables
T = Material thickness .
So I think that this is a start to find the allowances but will be inaccurate as the K factor varies .
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You spelled neutral wrong