10.2 COMMON WORKPIECE MATERIAL TYPES - BASIC MILL OPERATOR

The most common materials you will encounter when first starting out in a job shop are: mild steel, aluminum, stainless steel and alloy steel. - ANS True One of the most common material types in a machine shop is aluminum. Two characteristics of aluminum are: - ANS Very light weight and not prone to rusting When it comes to sheet and plate stock made from mild steels, you will hear the terms hot-rolled and cold-rolled used often. You can tell hot-rolled steel sheet or plate by its surface finish. The surface finish on hot-rolled steel is: - ANS Crusty and scaled Cold-rolled steel is the same as hot-rolled steel, but put through additional processing. - ANS True It is not important to match the raw material you choose to machine the part from with the raw material call-out on the drawing. - ANS False Mild steel is the most common material that machine shops use in machining. Mild steels are: - ANS Typically on the soft side and easy to machine Aluminum comes in a variety of alloys: 2000, 6000, and 7000 series.The most common aluminum alloy you will see in machine shops is 6061. - ANS True