10-07-2015, 10:07 PM
(10-06-2015, 11:57 AM)Highpower Wrote: I can't help with the polymer, but 400 SFM worked well for me on the aluminum. You'll need at least one "extra long" end mill to reach to the bottom of the fire control pocket.
Yep, I like to use the extra long 7/16" endmill with a radius on the edge for that pocket. Oh, and make sure it is a "center cut" type as well as that can come in real handy.
Here are a bunch of posts I brought over to my server that I had posted (on a different site) during my last AR build. Hopefully it still makes sense - AR 80% lower build
When I get the time I'll have to fill in some gaps and make it more readable.
-Ron
11" South Bend lathe - Wells-Index 860C mill - 16" Queen City Shaper