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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Index Traub TNL32-11

Turning Center’s Dual Drive Train Speeds Tool Transitions

By: Jedd Cole
The Traub TNL32-11 sliding/fixed headstock automatic lathe has a headstock movable in the Z axis, an upper and identical lower turret with X, Y and Z axes, and a counter spindle movable in the X and Z directions.

MakeTime Receives $8 Million in Funding

By: Jedd Cole
The funding is led by Colorado-based Foundry Group along with the company’s initial investors.

Multitasking Offers Medical Benefits

By: Derek Korn
This shop uses a bar-fed turn-mill with a B-axis milling spindle and custom workholding strategies to more competitively machine components complete for low-margin medical devices.

AMT, CMTBA Launch Plans for Chinese Trade Show in 2017

By: Jedd Cole
The China Chongqing International Machine Tool Show is scheduled for November 2017 and is planning for some 50,000 international attendees.

Hyundai Wia Appoints North America VP

By: Jedd Cole
Steve Pegram will be vice president over the United States, Canada and Mexico.


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