![]() If you had a part that was 7" long, and using a 0.004" step over, it would have to make 1,750 passes. So as you can imagine this process takes a really long time. I started at one end of the receiver and machined across the whole profile stepping over 0.004" each time. You can tell that it's already starting to look like a lower receiver.Īfter the profile was roughed, I then made a finish pass with a 1/4" carbide ball nose endmill. Here you can see the 1/2" carbide ball nose endmill roughing the profile. Here is what the lower receiver looked like at the start of the 1st operation. I cut the 5x2 billets of aluminum, and I was almost ready to start doing some cutting. After I programmed all the tool paths that I wanted the CNC machine to make, I sent the program out to the machining center. Since I already had the solid model of the lower receiver (the CAD part), all that was left was the CAM. CAM is often used along with CAD (Computer Aided Design) and this process is called CAD/CAM. After I had my game plan together, I started programming the lower receiver using a type of computer software called CAM (Computer Aided Machining). I spent many hours coming up with a game plan of how I was going to machine the lower receiver. After I found the solid model file for the AR-15 lower receiver, I knew what I wanted to do could be done. But instead of starting with a forging, I thought I wanted more of a challenge so I started with a block (billet) of aluminum. ![]() That got me thinking that I could do the same thing with CNC (Computerized Numerical Control) equipment. He done a great job of showing all the details of his work. He started with a raw forging, which is basically a block of aluminum, but in the shape of lower receiver. Ryan at Roderus Custom Gunworks was working on. I got the idea when I saw the lower receiver forging that Pvt. ![]() The AR-15 lower receiver was the first project that I started.
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