Does Aluminum plate stock (7075) have a grain direction that is significant enough to make a differance as to which direction a part should be made?
Aluminum plate (thickness >.250 inch) has three grain orientations, each with their own strength values. The three orientations are: the long tranverse (LT), the short transverse (ST) and the longitudinal (L).
for example: (from MIL-HDBK-5)7075-T62, 2.501-3.000 thick stock, ultimate tension allowable stress is L=67 ksi, LT=70 ksi and ST=66 ksi.
(edited for spelling)
This PDF has an explanation of the terminology used in the previous reply.
Look at the illustrations on page 11.