Objective 24.02

Identify, cut, drill, bend, shape, file, and grind cold metals

Identifying Metals

Ferrous: contain iron Will rust Have to be painted or oiled to be protected

Non-ferrous: do not contain iron

Identifying Metals

Metals can be identified by color, weight, texture, use, shape, forge or cast mars, and spark test

Color, shape, quantity, length, and position of sparks are used to identify metals using the spark test Cast iron has red lines High carbon steel has yellow lines with several star bursts Wrought iron has long straw-colored lines without bursts

Cutting Metal

If metal is too thick, snips or shears will not cut

Thick metal should be cut with a metal cuttings saw such as a hacksaw, band saw or abrasive cut-off (chop saw)

Drilling Metal

Drilling metal is done by securing metal in a machinist’s vise

Using a center punch and ball peen hammer to dent the metal to prevent the drill bit from wandering from the desired location

Using a drill and bit to drill the hole

Drilling Metal

A machinist’s vise should be used to secure cold metal for cutting, drilling, filing, or bending

The inside of a drilled hole should be smoothed with a round file

Flat files can be used to smooth the cut edges of cold metal

A grinder is used to shape and sharpen the hollow-ground cutting edge of tools such as wood chisels