# sheet metal help

• posted
I need help on sheet metal bend allowances for example at work if I were to
make a component with 2 bends I would take the outside sizes and deduct a
bend allowance according to the gauge. e.g.
1.0mm CR4 ba = 1.8 per bend
Flange 1 30 o/s
Flange 2 50 o/s
Flange 3 200 o/s =280-2 bend allowances Flat length would need to be
276.4 but when I use solid works the sizes are different, how do I set up
the bend allowances to match what we use at work?
Jules
• posted
try using bend deduction (excel table)
• posted
Try this:
BA = (.55*T)+(1.57*R)*(A/90) .55 for copper,.64 for brass and alum,.71 for steel.
Where BA = bend allowance T = metal thickness R = inside bend radius A = angle of bend
• posted
Yes, look up bend tables. In a bend table you can insert all the bend settings that your company uses for each thickness of material and SW will automatically use these settings.
• posted
Hi Jules!
This may or may not be useful to your particular application, but since bend allowance is so often brought up here (every few months) I have compiled a little information that explains some of the principles and which might address some of the future questions.
or
Regards,
SMA
• posted
Sean-Michael,
Excellent information & well presented - Thanks!
Is it OK if I present this at our user group meeting?
Merry :-)