Milling  is the production of a machined surface by removing metal with a rotary cutter.  Much like a woodworking router, a variety of jobs can be done by using different sizes and shapes of cutters.  We can cut grooves in a seat post, recess a line around a chainring, even change the shape of a crank arm. 

This seatpost has been etched with a lion’s head and a leaf pattern.  Flutes were milled to surround the graphics.  The flutes are 1/16” and 1/8” wide and alternate.  A flat mill was used instead of a round one (which would cut a concave shape) because this is a thin walled seatpost.  To achieve a good look, a concave flute would have to cut too deep into the metal, which would compromise the strength of the component.  Concave flutes work quite well on thicker seatposts, stems and other items that have enough supporting material.

An example of a flat flute (left) vs. a round, or concave flute (right).

Drilling · Cutouts · Etching · Inlay · Polishing · Engraving

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