Tooling & Workholding

Milling Tools

Milling is the work of producing a flat or precision-contoured surface on a machined workpiece by using a rotating tool, and generally by taking multiple parallel passes with that tool. The work can be done on a machining center or milling machine, and can also be done on a lathe, turning center or turn-mill machine that happens to have rotary tool (or “live tool”) capabilities. The tools for milling include both solid tools and inserted tools—the latter consisting of a tool body that uses replaceable cutting inserts. Carbide is the most likely material for milling tools, though high speed steel is another choice, as are ceramic, cermet and diamond tools in certain more demanding milling applications. A common milling tool variety is the “end mill,” which generally describes a relatively narrow cylindrical tool that can mill on both its tip and its side, and can reach into various constrained features and spaces. The end mill can be flat-bottomed for flat surfaces, or ball-nosed for milling up, down and along the contours of complex milled shapes such as die and mold surfaces. Another common milling tool variety is the “face mill,” a generally larger-diameter tool designed for efficiently milling a wide, flat surface in an economical number of passes.

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Featured Zone Content

Video: Hard Pocket Milling


Relieved end mills and pre-machining of corners are two important considerations for accurate pocket machining in hard steel.



Coolant-Through Thread Mills Allow Tool to Retain Hardness

By: Lori Beckman (editor)
Scientific Cutting Tool’s coolant-through thread mills are designed to efficiently use coolant-through technology that allows the tool to retain its hardness, and thereby extending its life, the company says.

Widia VSM490 shoulder milling platform

Double-Sided Shoulder Mills Achieve High Surface Quality

By: Edited by Jedd Cole
The VSM490 double-sided shoulder milling platform from Widia achieves true 90-degree shoulders and floors with high-quality surface finish for markets such as transportation and moldmaking.

A Formula for Cutting Tool Success

By: Chris Felix
The hardness and toughness of a tool are generally counteractive forces, and finding the right mix can be a challenge. Wouldn’t it be nice to have both?

Diamond Coating for Tungsten Carbide End Mills Allows Milling of Cemented Carbide

By: Lori Beckman (editor)
U.S. Union Tool Inc. has developed a diamond coating for its UNIMAX Series UDCB and UDCL tungsten carbide end mills to improve hardness and durability for cutting cemented carbide.

Sandvik Coromant CoroMill QD cutter

Groove Milling Cutters Suit Narrow, Deep Cutting

By: Edited by Jedd Cole
Sandvik Coromant’s CoroMill QD cutters are designed to ease chip evacuation during groove milling and part-off operations.


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