Quoted: If you believe that a forged casting is that same as an actual billet, that would explain your point of view.
I would be interested in comments from someone who has knowledge in this field, but that hasn't happened up to this point. Winston_Wolf made his comment based off being a engineer in another thread, and that seems to be what I've heard from other people with similar backgrounds. Your thoughts are different, and I can't remember my metals enough to give a full account, so we will end up having to agree to disagree. Certainly not the end of the world, or even a big deal.
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That's not what I said. I said that a 7075-T6 billet is forged into a rough (using your words)"casting" which is then machined to it's final dimensions. I was trying to show that the lower forging in the pic above comes from an aluminum billet, not that it is a billet. Though I guess you could still call it billet because it still needs to be finisihed.
I found this tid bit when I was researching "forging" and "billet".
The two words "forged" and "billet" have become synonymous, but in fact the manufacturing process is called forging and the material used is an aluminum billet - a solid piece of dense aluminum. The forge, a huge machine that exerts thousands of pounds of pressure on the metal, basically presses or rolls the billet into its fundamental form. This forging is then machined to final finish. The Aluminum Association (www.aluminum.org), a trade organization which sets industry standards, defines a “billet” as a "hot-worked, semifinished product suitable for subsequent working."
If the above definition of a billet is correct isn’t it correct to say that both 6061-T6 and 7075-T6 lowers can start as billets?
The link below is to a CNC newsgroup thread discussing what it means when something is said to be machined from billet. It's not gun related but still relevent to this discussion.
groups.google.com/group/alt.machines.cnc/browse_thread/thread/11bd532b72cf8399/08e5becf80af41fb?q=%2Bwhat+%2Bis+%2Bbillet+%2Baluminum&hl=en&I also want to add that I've never once said that Sun Devil lowers were crap or made of material unsuitible for use on an AR. All I'm saying is that to
me they are not worth the price they cost because, though they may look nicer, lower receivers made of better material can be had for the same or less money.
Lastly, yes I agree that for now we'll just have to agree to disagree and let the experts take it from here.
Cheers!