Metal Cutting

Turning Machines

“Turning” defines the work that is traditionally done on a lathe. As lathes have grown in sophistication, some of these machines have been given different names. “Turning centers” is a term sometimes applied to machines with particularly sophisticated capabilities related to secondary spindles and/or rotating tools for milling and drilling. Another term, “turn/mill machines,” describes machines that can be thought of as being just as capable at milling and drilling parts as they are at turning. In turning, unlike in milling or drilling, the workpiece spins while the cutting tool does not. The cutting tool feeds along the length or diameter of the rotating part. The workpiece in turning can be held in a chuck or collet, to name two of the more common workholding methods. The turning machine may also include spindles for the cutting tools to accomplish non-turning operations such as milling and drilling. If this is the case, the machine stops the workpiece from spinning in order to perform these operations within the same machining cycle as the turning work. In fact, for some parts, the milling and drilling capabilities may be used so extensively that a non-turned, non-round part might also be produced on this type of machine. Lathes, turning centers and turn-mill machines can have horizontal or vertical spindles. Horizontal spindles are more common. If the machine has a vertical spindle, then the spindle may locate below or above the machine. If the workpiece rests on a table driven by the spindle, then this machine is generally called a vertical turret lathe, or VTL. If the workpiece is held from above by the vertical spindle, then this type of turning machine is generally called an inverted vertical lathe.

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GF Machining Solutions Mikron Mill P 800 U ST

Multifunction Milling Center Performs Four-Axis Turning

By: Jedd Cole
GF Machining Solutions introduces the Mikron Mill P 800 U Simultaneous Turning (ST) which provides milling and turning in a single machine.

Index’s CNC Multi-Spindle Lathe with Six Spindles

By: Lori Beckman
Workpieces are automatically indexed through the six positions, receiving two or more operations at each position. The result is high production of precision turned workpieces.

Dr. Kapitza and Dr. Mori

Slideshow: DMG MORI Pfronten Open House 2016

By: Stephanie Hendrixson
Attendees of DMG MORI’s annual open house got a firsthand look at six new machine models, plus insight into company strategy.

Owners

Loyalty Bolsters Shop’s Growth

By: Chris Felix
This shop has found its groove with four Ganesh CNC machines that have proven to deliver the performance and quality the company and its customers expect.

The rotary table balance control system on this five-axis machine enables 600-rpm turning of non-symmetric parts weighing as much as 8,818 pounds.

Three Design Elements for Effective Turning on a Five-Axis Machine

By: Derek Korn
Here are three design elements that enable this five-axis machine to effectively turn workpieces, even if they aren’t symmetric.


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