Quote:
Originally Posted by jman4747
Cost matters too right?
I really don't think you will put yourself at huge risk of going overweight by using steel just because you used steel. We use steel parts a lot and haven't been overweight ever (or even close). Whatever is best for the application (or available at the time). Both the "no steel ever" and "7075 is inferior for FRC" generalizations are both wrong.
To the op: 6061 for almost everything. Mild steel, 7075 Aluminum, or 2024 Aluminum for shafting.
5052 or 3003 for sheet metal.
6061 and 5052 are both very weldable (5052 more so), and we've had welded frames made with both before.
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It's easily a 7 lb weight difference if you add up all the gears, sprockets and shafts on an average FRC robot.