About 9:43 looks like one end of the mag well was chain drilled. How do they get finished as they move through a multi-setup process? Does the next step involve shuffling them to different positions in the fixtures? Is that done on another machine? Do they have 4 machines so everything proceeds in a logical flow? Could the position of tooling be shuffled in the changer to make toolchanges faster? As it moved around on the fixture, could the order of ops be shuffled to reduce travel times? I expected the 4 lowers to be in various stages of completeness, but for this video, they all seemed virgin. At various points I wondered about order of operations. Wondering whether it was worth the cost of the tool change to do this or if it’d been faster just to use the end mill for everything? I am guessing the issue was the smaller hole and how slowly you’d have to plunge without the pilot, but I don’t know that for sure. It then interpolates the buffer hole with an endmill and also makes a hole below it flat-bottomed. About 2:36’ish it fetches a twist drill which is used to make two pilots on the threaded buffer hole in the 4th axis. What’s with the rubber flap guarding the toolchanger? Looks like a user add-on to keep chips and other contaminants out of the tools. They say that unless you use every square inch of your machine’s travel for each setup, you’re leaving money on the table. There are 4 receivers here including one in a machining vise, two laid down on either side on a plate fixture, and one in a 4th axis. This no doubt makes the process more accurate, more efficient, saves time on setup too,and likely accomplishes some mistake-proofing too (what the Lean Manufacturing crowd calls “ Poka Yoke“). In-process probing–cool! Before any machining starts, the probe comes in and identifies the exact location of all the key features on the forgings. Here are my thoughts as I watched it, stream of consciousness style: On this particular video, I saw a number of things that I found interesting. 
I love to watch and try to learn things from videos like this.
This video was done by Palmetto State Defense, LLC, and it shows a number of operations as well as their fixtures for finishing 80% forgings on their VMC.
#Cad drawing for a ar magazine loader pro
We have a lot of readers who are interested in firearms, and I’m a shooter myself, so I thought I’d pass along this fascinating video about how a pro shop goes from a forged 80% lower to a finished AR-15 Lower Receiver:
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