Milling Instructions - ghostguns/80lower GitHub Wiki

#Ghost Guns CNC CAM Software# ##80% Percent Lower Receiver## ###Fire Control Pocket G-Code###

The following g-code is for Mach3 CNC machines. Used in machining the fire control pocket from 80% percent lowers using a CNC machine running Fanuc like (Mach3). Machining a [80 lower] (https://www.ghostguns.com/search?tag=lowers) receiver is like any other part; essentially all you need is to locate 3 positions for yourCNC in order for it to run your program. These three locations are called your X, Y, & Z coordinates. The X & Y coordinate is located using an edge finder, and the Z coordinate is located with your cutting tool. Once you find each coordinate you “zero” out the value for that coordinate on your machine, and then you load your program and run it.

These instructions work for the [DPMS 308 80% Lower] (https://www.ghostguns.com/home/9-308-80-percent-lower-receiver.html) Receiver and the [AR15 80% Lower] (https://www.ghostguns.com/home/10-ar15-80-percent-lower-receiver.html) Receiver.

Terms of Use: By using these instructions and the 3 referenced FCG programs (POCKET.TAP, SELECTOR.TAP, and TRIGGER.TAP)you understand and agree that all programs are free open source code intended for educational and personal use only and bear no guarantee of working or warranty. You also agree that it is your responsibility to check, understand and verify that the code provided is safe to use with your machine in order to prevent serious damage to your machine or injury to yourself. By using these instructions and/or any code provided along with these instructions you release the authors from any liabilities and/or claims. And you attest that by using these instructions you will not be breaking any laws.

Speeds: Using generic FANUC code the program will ramp and feed at 10 in/min, take a .03 in. depth of cut, and run the spindle at 2000 RPM on all end‐mill operations. The drilling plunge feed rate is 2 in/min at 2000 RPM using peck cycles. Please adjust according to your machine or preference. It is highly recommended using a [80% lower fixture] (https://www.ghostguns.com/tools-and-fixtures/8-cncfixture.html) when holding the unfinished receiver in your milling machine.

Tooling used for Each Program: (note: only use cobalt or carbide, don’t use drills designed for hand tools) For the POCKET.TAP program use: 3/8" in. 2‐Flute Flat End Mill (3” total length) Commonly found in [80% lower Drill Mill Tooling Kits] (https://www.ghostguns.com/tools-and-fixtures/22-jig-drill-bit-kit-ar15-308dpms.html) .