1. Objective 24.02 Identify, cut, drill, bend, shape, file, and grind cold metals

2. Identifying Metals Ferrous: contain iron Will rust Have to be painted or oiled to be protected Non-ferrous: do not contain iron

3. 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

4. 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)

5. 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

6. 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