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Flatbed turning – Controlled

Controlled turning process where circular workpiece where lathe centers or steady rests are usually required.

Illustration of Flatbed turning – Controlled

The process

The workpiece is clamped in a rotating chuck usually with three jaws. [1] The tool holder [2] positions turning tools with fixed or interchangeable cutting inserts, and moves in an axial or laterally along the rotating surface removing material via chip breaking for creating a rotationally symmetrical detail. The positioning is controlled by a cutting program.

Longer workpieces require a revolving center [3] to support (hence the name) the end of the rotating workpiece to prevent jitters and vibrations during processing.

If the end of longer workpieces is to be machined, it is difficult to support this with a center.

In these cases, usually a follower rest [4] with included clamping. In some cases, a roller anvil [5] is used to prevent the workpiece jitter which creates chatter marks and lower tolerances.

Often controlled systems equipped with tool changer are used to minimize downtime for tool changes.

Chip breaking
The way in which a chip breaks
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