MET 1321
Machining and Welding
Introduction to Machining
The Lathe
A machine in which a workpiece in a workholding device is
rotated while a stationary cutting tool is forced against it.
Some operations performed on a lathe include turning,
boring, facing, thread cutting, drilling, and reaming.
The Lathe
Cylindrical parts are typically machined on a lathe.
Drill Press
A machine that rotates a drill against stationary material
with sufficient pressure to cause the drill to penetrate
the material. It is primarily used for cutting round holes.
Drill Press
Drilled holes.
Grinding Machine
Belt Grinder
Surface Grinder
Surface Grinder
Bench Grinder
A machine that removes material by rotating an
abrasive wheel or belt against the work.
Band Saws
Band machining makes use of a continuous saw
blade to ensure rapid chip removal.
Milling Machine
A machine that removes metal from work by means
of a rotary cutter.
Milling Machine
Milled parts.
Broaching Machine
A machining process for flat, round, and contoured
surfaces, both internal and external. A broach is pushed
or pulled across the work, with each tooth removing
only a small portion of the material. Cutting a key is
typically a broaching process.
Nontraditional Machining
Electrical Discharge Machining
(EDM)
A process by which an electric spark is used to erode
away small amounts of material from a workpiece. EDM
is used to machine soft or hard materials that are
difficult to work by conventional machining.
Ultrasonic Machining
A machining process in which sound waves above
the audible range propel an abrasive for use as a
metal-cutting tool.
Electron Beam Machining
(EBM)
http://www.sodick.com/index.php?t=products/ebm
A metal removing process in which heat is produced
by a sharply focused electron beam.
Laser Machining
A process that uses an intense source of coherent
light energy as a cutting tool.
Computer Numerical Control
(CNC)
CNC Lathe
CNC Surface Grinder
CNC Mill
A system in which a program is used to precisely
position tools and/or the workpiece and to carry out
the sequence of operations needed to produce a
part.