Can any one suggest me K factor for stainless steel and aluminium for defferent thickness.
I use 0.285 for SS and 0.33 for AL
Facing problem in achieving exact bending dimension.
Have you tried using bend deduction instead?
Then you can control every bend angle/radius/thickness separately, and refine it if necessary...
See attached example, and build your own tables...
I agree with Fredrik. K factor is an approximation at best. Bending a number of bends with different angle in one setup each may require a different K factor depending on the angular difference. Shop tested and proven bend deductions are the most accurate way to determine blanks for bending.
Selvaraj, for press brake work in light gage sheet metal, .25 inches and thinner, mostly air bending or bottom bending, I use k-factor of .445 for crs and ss, and .38 for aluminum. This typically gets us within .010 inch per bend at 90 degrees, when the inside bend radius is equal to one to two material thicknesses.
For stampings you will need to prove out the die. For folding machines, you need to test blanks of specific thickness, length and for each tool set.
Your mileage may vary but Bernie and Fredrik are on the money with their advice too.
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