EMAE 160 – MACHINING EXAM
QUESTIONS AND ANSWERS
What does the designation "12 in. x 36 in." mean in reference to a lathe? -
ANSWER-• 12 in is the max part diameter (swing over bed), 36 in is the length that's
mounted between centers
Which abrasive material is most appropriate for grinding hardened steel? -
ANSWER-Aluminum oxide
What are the two materials known as "Super Abrasives"? - ANSWER-Cubic boron
nitride and diamond
Name the three types of cutting fluid according to chemistry. - ANSWER-Natural,
emulsified, and chemical
Name the three most common machining processes. - ANSWER-Turning, milling,
and drilling
How is feed rate denoted for a manual lathe and drill press? - ANSWER-• Manual
Lathe = feed/rev
Drill press = inches/rev
What is barstock? - ANSWER-Strips of raw, purified material
What is a blind hole? What do we not like about blind hole? - ANSWER-A hole that is
drilled to a specific depth and does not go the whole way through the workpiece.
Can't get a flat bottom on the hole
Counterbore is for what type of fastener? Countersink? - ANSWER-• Counterbore:
socket head cap screw (sits flush with or below the surface)
Countersink: bolt, screw, or rivet
What is a chamfer? - ANSWER-A beveled (flattened) edge on a workpiece
connecting two surfaces
What are burrs? - ANSWER-Small pieces that remain attached to material after
machining
What materials are cutting tools commonly made from? - ANSWER-Carbon tool
steel, high speed steel, cast alloys, cemented carbides, ceramics, cermets, diamond,
polycrystalline diamond, polycrystalline cubic boron nitride
Given the following parameters, find the appropriate RPM and feed rate in
inches/minute.
Cutting Speed: 150 SFM
QUESTIONS AND ANSWERS
What does the designation "12 in. x 36 in." mean in reference to a lathe? -
ANSWER-• 12 in is the max part diameter (swing over bed), 36 in is the length that's
mounted between centers
Which abrasive material is most appropriate for grinding hardened steel? -
ANSWER-Aluminum oxide
What are the two materials known as "Super Abrasives"? - ANSWER-Cubic boron
nitride and diamond
Name the three types of cutting fluid according to chemistry. - ANSWER-Natural,
emulsified, and chemical
Name the three most common machining processes. - ANSWER-Turning, milling,
and drilling
How is feed rate denoted for a manual lathe and drill press? - ANSWER-• Manual
Lathe = feed/rev
Drill press = inches/rev
What is barstock? - ANSWER-Strips of raw, purified material
What is a blind hole? What do we not like about blind hole? - ANSWER-A hole that is
drilled to a specific depth and does not go the whole way through the workpiece.
Can't get a flat bottom on the hole
Counterbore is for what type of fastener? Countersink? - ANSWER-• Counterbore:
socket head cap screw (sits flush with or below the surface)
Countersink: bolt, screw, or rivet
What is a chamfer? - ANSWER-A beveled (flattened) edge on a workpiece
connecting two surfaces
What are burrs? - ANSWER-Small pieces that remain attached to material after
machining
What materials are cutting tools commonly made from? - ANSWER-Carbon tool
steel, high speed steel, cast alloys, cemented carbides, ceramics, cermets, diamond,
polycrystalline diamond, polycrystalline cubic boron nitride
Given the following parameters, find the appropriate RPM and feed rate in
inches/minute.
Cutting Speed: 150 SFM
