How? The collet area portion of the end mill shank is reduced to a standard 1/4” diameter. Our Answer and SolutionĪ custom, Patent Pending and industry first 5/16” end mill for use with compact routers. ![]() A low quality finish, slow milling operation, and broken end mills are a near guarantee. Not only does the constant unsettling feedback slow the user down, the net effect is a cutting surface that may jump outside of the intended template area. The output of “jolting” or “chattering” the user will commonly feel using other jigs with a 1/4” end mill, is the result of the end mill flexing and bending as it removes material. With other jig designs, the end mill is also unsupported for much of the milling operation, which produces chattering, plowing, and the high potential for tool breakage. The long length and relative narrow diameter of the aforementioned end mills results in more deflection than what would generally be acceptable in achieving a true high quality finish of the FCG pocket. Since the depth of cut required for milling the FCG pocket of a lower receiver necessitates an end mill length of approximately 4 inches, the result is a tool that is much longer and narrower than would otherwise be ideal for rigidity and strength. ![]() This limits the maximum diameter of the tool, in this case the end milling bit, to 1/4". All compact routers on the market are equipped with a 1/4" collet size. Challenges of Milling AluminumĪ drawback for using a compact router to mill aluminum, if there is to be one, is the limiting size of the collet. This is all for good reason, because they are sufficiently powerful, relatively inexpensive, readily available at home improvement stores, and comfortable to use for extended periods. ![]() Milling aluminum, such as with finishing an 80% lower receiver, is possible with the use of a router end mill cutting tool.Ĭompact routers have been to this point, the popular choice for enthusiasts who wish to finish 80% lower receivers at home in conjunction with a router based lower receiver jig. While at a glance, end mills look similar to common drill bits, they are different from drill bits in their application, geometry, and ability to cut in all directions. What is an endmill?Īn end mill is a type of milling cutter, used in machining and CNC manufacturing processes. This end mill bit for 80% lower is custom designed and manufactured for 5D Tactical, and is not available for sale elsewhere by any tooling supplier or manufacturer. Please Note: 5D Tactical AR-15 and AR-308 Router Jigs require the use of our router mill bits.
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