EMAE 160 – MACHINING EXAM
QUESTIONS AND ANSWERS
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
____________ is a procedure applied to worn grinding wheels to expose fresh
abrasive grit and remove chips that have clogged the wheel. - ANSWER-Dressing
____________ is similar to dressing, but also restores the ideal cylindrical shape of
the grinding wheel. - ANSWER-Truing
State three reasons that machining is commercially and technologically important. -
ANSWER-• Is applicable to most materials
• Can create a wide variety of shapes
Close tolerances and good surface finishes
List four parameters of machining that are included within the scope of "cutting
conditions." - ANSWER-• Cutting speed
• Feed rate
• Depth of cut
Use of cutting fluid
Identify three desirable properties of a cutting tool material. - ANSWER-Toughness,
hot hardness, wear resistance
Why are surface and cylindrical grinding processes technologically and commercially
important? - ANSWER-Fine surface finish and very close tolerance
QUESTIONS AND ANSWERS
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
____________ is a procedure applied to worn grinding wheels to expose fresh
abrasive grit and remove chips that have clogged the wheel. - ANSWER-Dressing
____________ is similar to dressing, but also restores the ideal cylindrical shape of
the grinding wheel. - ANSWER-Truing
State three reasons that machining is commercially and technologically important. -
ANSWER-• Is applicable to most materials
• Can create a wide variety of shapes
Close tolerances and good surface finishes
List four parameters of machining that are included within the scope of "cutting
conditions." - ANSWER-• Cutting speed
• Feed rate
• Depth of cut
Use of cutting fluid
Identify three desirable properties of a cutting tool material. - ANSWER-Toughness,
hot hardness, wear resistance
Why are surface and cylindrical grinding processes technologically and commercially
important? - ANSWER-Fine surface finish and very close tolerance
