For optimum strength, if strength is needed, the bend should take the bar from condition A to condition B. Condition B is the temper appropriate for the application. I don't think there's any heat treatment to achieve condition B. Condition A might be fully annealed, quarter or half hard, or near full hard.
To evaluate what can be done with your particular bar, saw off a piece from the end which is Mill it if needed to get the proportions right, while the absolute size matters little.
Then clamp the ends 0.2 inches and bend with no heat treat to the same 45 after springback as you want with the full 10x scale piece. Check for cracks. If it cracks, or has stress marks, either full anneal and count on less than full strength, or cut another piece and figure out how much to anneal it.
Whatever you do, don't bend it hot. Brass and copper are hot short, that is, they sustain near 0 % elongation before rupture when hot.
So divide everything except the angle by 10, and make a trial. You're only losing 0.025 off the end of a 12 inch piece, after all.
12 x 1.5 x 0.25....
12/1.5 = 8; 1.5
/ 0.25 = 6. Using a larger scale will make the piece smaller, so....
12 / 8 = 1.5; 12
/ 6 = 2. We don't have 2.
1.5 / 8 = 3/16 ; 1.5 / 6 = 0.25 So what will fit in the end of the bar? Clearly scale 1/8. So the bit off the end will be 1.5 x 3/16 x 1/32.
Did I get that right?
Yours,
Doug Goncz, Replikon Research, Seven Corners, VA Unpublished work Copyright 2003 Doug Goncz Fair use and Usenet distribution without restriction or fee Civil and criminal penalties for circumvention of any embedded encryption