The document discusses four common processes performed on a center lathe: facing removes marks and squares the end of the metal; parallel turning reduces the diameter along the axis; tapering uses the compound slide to cut the metal into a conical shape by adjusting the slide angle; and parting separates the finished part by slowly moving the parting tool in to cut deeper and wider to prevent sticking or breaking.

1. Metal Machine Tools
Centre Lathe Processes
Facing
Usually the first process performed. A
cut is made across the end of the metal
to make it right angles to the axis and
remove any marks from cutting.
Parallel Turning
Cutting along the metal, parallel to its
axis, to reduce its diameter.
Tapering
Using the compound slide this is some-
where between facing off and parallel
turning to cut the metal to something
like a cone shape. The angle can be
changed by adjusting the compound
slide.
Parting
When the part is finished it is best to re-
move it in a similar way to facing the
ends. The parting tool must be moved in
slowly. As the cut is made deeper the
tool must be pulled out and moved to
the side to make the cut wider to stop
the tool sticking and breaking.
Craft, Design, and Technology at Hawick High School