Machining and Turning

What are the three main categories of machining?

Cutting (e.g., turning, milling), Abrasive processes (e.g., grinding), and Advanced machining (e.g., EDM, laser).

Difference between traditional and CNC machines?

CNC machines are controlled by computer numerical control to produce products, whereas traditional machines (like basic lathes) often require more manual maintenance and setup

Advantages of machining

Provides high dimensional accuracy, excellent surface finish, specific texture, and can be more economical than other manufacturing processes

disadvantages of machining:

It generates waste material, requires more energy and labor than other methods, and can be time-consuming

Turning

A process involving rotating a workpiece on a lathe along an axis while a tool shaves or cuts into it

What is facing?

Creating a flat surface perpendicular to the axis of rotation

What is Material Removal Rate (MRR)

The volume of material removed per unit time

What is a chuck?

A clamp used to hold the workpiece steady while it is being turned

Three-jaw vs. Four-jaw chucks

Three-jaw chucks are for circular parts; four-jaw chucks are for square or irregularly shaped parts

What is a lathe center?

A tool ground to a point used to accurately position a workpiece on an axis and support longer workpieces to prevent deflection

What is boring?

Producing internal surfaces or profiles similar to turning; requires a stiff boring bar to avoid chatter.

What is parting?

The act of separating the finished part from the remaining stock

Bench Lathes:

Small, low-power machines that usually utilize manual feed.

Tracer Lathes

The cutting tool follows a path that duplicates the contour of a template

Automatic Lathes

Machines where parts are fed, machined, and removed automatically