MAchining and milling are extremely precise operations. They are precise not only in the fine details that CNC machining can create or bring out on a surface, but they are also extremely precise in the tools that must be used in conjunction with the materials being machined. Milling and machining are even so prescriptive as to go so far as to specify when such end mills should be used on what surfaces and even what coatings are most appropriate.

The point being that machining is extremely precise, you may have come across chamfer mills and wondered what their purpose was. If you are unfamiliar with machining, consider this a primer.

Some mills leave a rough or sharp edge, sometimes leaving burrs, on the surface of the materials being worked. Using Chamfer Mills is one way to help eliminate leaving a sharp edge on a surface that must be left smooth.

For example, if you’re performing a relatively simple machining operation like drilling a clean hole through a metal, the edges of that hole might be left very sharp. Chamfer mills can be used to create a countersink around the hole to smooth out, or entirely eliminate any sharp edges that were left behind.

If the entire edge of a machined piece, and not just a hole, is sharp or covered in burrs, using a chamfer mill for deburring can save a lot of time and pain. Whereas it would take a fair amount of time and a lot of labor to manually deburr an edge, using chamfer mills to chamfer or bevel an edge can do so and remove any burrs that were there in the process.

Speaking of which, creating a chamfer or a bevel is another use of chamfer mills. A chamfer is an edge that is slightly angled but left with a portion squared, whereas a bevel is angled all the way across the face. In cross-section, it would appear to be an angled cut rather than a square edge.

Those are some of the essential functions of chamfer mills when used with chamfer cutters. It’s simply enough, but they perform very important functions for machinists when smooth surfaces or edges are required in accordance with any specifications.

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