Zone: Machining Centers & Milling Machines

How to Improve Machining Center Accuracy

Accuracy is not just inherent to the machine—it also depends on how the machine is used. Try these techniques to let a new or existing CNC machining center achieve its potential precision.

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Video: Getting Started With Minimum Quantity Lubrication

Minimum quantity lubrication does not require a special machine tool or special tooling. This video makes the case for MQL and describes how to apply it effectively.

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How is Large-Part Machining Different?
8/27/2010 Modern Machine Shop: A shop serving the wind-power industry illustrates some of the challenges particular to machining massive workpieces.
Composites Machining for the F-35
8/3/2010 Modern Machine Shop: Lockheed Martin’s precision machining of composite skin sections for the F-35 provides part of the reason why this plane saves money for U.S. taxpayers. That machining makes the plane compelling in ways that have led other countries to take up some of the cost. Here is a look at a high-value, highly engineered machining process for the Joint Strike Fighter aircraft.
Find Your Speed Outside of Machining
8/2/2010 Modern Machine Shop: This short-lead-time mold shop achieves its most significant time savings by looking outside the machining cycle. However, one of those elements outside the cycle—palletized setup—ultimately led to cycle time savings via five-axis machining.
Video: Palletization and Five-Axis Machining in a Mold Shop
8/2/2010 Modern Machine Shop: Die Tech & Engineering describes how palletization and five-axis machining work together to deliver efficiency.
Video: What is Duplex Milling?
7/23/2010 Modern Machine Shop: This footage shows two-sided milling for fast production of square blanks.

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Overview Of:
Machining Centers & Milling Machines

The term “machining center” describes almost any CNC milling and drilling machine that includes an automatic toolchanger and a table that clamps the workpiece in place. On a machining center (as contrasted with a turning machine), the tool rotates, but the work does not. The most basic variety of this type of machine is also the most basic CNC machine tool—a vertical machining center. While vertical machining centers can be high-end machines because of their precision and/or their size, a small and simple vertical machining center is a relatively low-cost CNC machine tool that often represents a new machine shop’s first machine tool purchase. The orientation of the spindle is the most fundamental defining characteristic of a machining center. Vertical machining centers and horizontal machining centers have (obviously) vertically and horizontally oriented spindles. Vertical machines generally favor precision while horizontal machines generally favor production—but these generalizations are loose, and plenty of machines break out of them. Other choices in machining center orientation include the universal machining center, which can change between vertical and horizontal spindle arrangement. More common than this is the five-axis machining center, which adds rotary motion to the machine’s linear motion. The machine pivots the tool and/or the part not only to mill and drill at various angles, but also to mill swept surfaces. Machining centers linked by an automated pallet system can form an automated machining cell. Such a cell can machine a queue of different parts without operator attention by shuttling the parts in and out of the various machines as appropriate. Related machines in this category include the boring mill, which generally describes a large machine for heavy and/or precise milling and hole making. Another related machine is the manual milling machine. Such a machine may have some basic programmability, but it generally lacks an automatic toolchanger, meaning the tool change is a manual step.