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Posted: 12/24/2009 1:52:08 PM EDT
How do the big manufactors do it? They machine out the mag well then use a broach to square the corners? There a CNC broach that can start from a hole in the mag well? I have watched videos on youtube of broachers run and they all seem pretty slow. Just curious really. I am just going to buy an 80% lower with the well EDM cut.
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Posted: 12/24/2009 2:51:19 PM EDT
I'm not sure how it's "usually" done as i'm sure there might be a few different ways thats it's "usually" done. I have always thought you could mill most of the material out and use a keyway broach with a custom guide block to to fit the area milled out and get all corners as needed. I have also seen some done with small diameter long drill bits to get a radius in the corners and then mill out as much of whats left and finish up with a file.