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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Okuma’s 2SP-150H Horizontal Lathe Proves Compact and Flexible

By: Lori Beckman (editor)
Okuma’s 2SP-150H horizontal twin spindle lathe offers high metal removal rates in a small space and is especially useful for small part machining.

Leadership

A Youthful Approach to Production Machining

By: Chris Felix
Growing up in the industry helped this young shop owner learn key strategies for getting the most from his machines.

Doosan Expands Range of Puma GT Turning Centers

By: Lori Beckman (editor)
Doosan has expanded its range of Puma GT series turning centers with four models: the Puma GT2600, GT2600M, GT2600L and GT2600LM.

Doosan Puma GT

Turning Centers Provide Added Stability for Deep Cuts

By: Edited by Jedd Cole
Doosan has expanded its range of Puma GT turning centers with four new models: the GT2600, GT2600M, GT2600L and GT2600LM.

VT-650 single-spindle vertical lathes

Vertical CNC Lathes Can Combine to Single Control for Mass Production

By: Edited by Jedd Cole
Hwacheon Machinery offers its VT-450/VT-650 single-spindle and VT-450/-650-2SP twin-spindle vertical CNC lathes designed for mass production with reduced cutting times for automotive parts such as brake discs, brake drums, hubs and valves.


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