Zone: Machining Centers & Milling Machines

OVERVIEW: 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.

Featured Zone Content

Beyond Secondaries: Vertical Machining Center Enhances OEM's Capability

Like many turning based shops, Clippard Instrument Laboratory first applied vertical machining centers to perform secondary operations on its screw machined parts. That view has changed for the better. ...MORE

Bloodhound Fin Support Machined with Vortex

Machining strategy contributes to 40 percent cycle time saving on large five-axis aluminum part. ...MORE

Engis SPM 8000 single-pass bore finisher

Bore Finishing System Equipped with Robotic Loading

Engis Corp. exhibits its model SPM 8000 single-pass bore finishing system equipped with six-axis robotic parts loading and unloading. ...MORE

Video: Robot Changes Vise Jaws for Continuous Machining

If a robot can load and unload parts, why can’t it do the same for workholding? Here is video of a robot changing the vise jaws so the same machining center can run different operations in unattended machining. ...MORE

Product Slideshow: Machining Centers

The March issue includes a spotlight section on machining centers. Click through the slideshow to learn more about these machines and others. ...MORE

Yasda 7Ti five-axis HMC

Five-Axis HMC Handles Heat-Resistant Materials

Available from Methods Machine Tools, the Yasda YBM 7Ti five-axis horizontal machining center features a rotary table and rigid machine structure for high-performance machining of heat-resistant materials such as titanium and Inconel. ...MORE

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