EMAE 160 EXAM QUESTIONS WITH
100% CORRECT ANSWERS | LATEST
VERSION 2025/2026.
What is the formula for RPM? - ANS (cutting speed*12)/piD
What is the formula for feed rate? - ANS RPM * chip load * number of teeth
Describe broaching and provide an example of its application. - ANS A broach is a cutting tool
with teeth increasing in size going from rough to fine cutting. Cutting a rectangular key slot
A cutting edge that can hold up under high temperatures experienced at the chip-tool interface
possesses a quality called what? - ANS Hot Hardness
Reaming is used to? how? - ANS Improve tolerance on a drilled hole. By widening/boring a
hole with high accuracy
Which metal cutting condition has the greatest effect on tool wear? - ANS Cutting Speed
Describe/Sketch the difference between climb (down) milling and conventional (up) milling. -
ANS Conventional: Piece moves with the rotation of blade (No backlash)
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,Climb: Piece moved against rotation of blade (Backlash if old machine, better finish, improves
tool life.)
Describe the difference between peripheral milling and face milling. - ANS Peripheral =
spindle is parallel to cutting surface.
Face = spindle is perpendicular to the cutting surface
What is a procedure applied to worn grinding wheels to expose fresh abrasive grit and remove
chips that have clogged the wheel? - ANS Dressing
This procedure is similar to dressing, but also restores the ideal cylindrical shape of the grinding
wheel. What is it called? - ANS Truing
State three reasons that machining is commercially and technologically important. -
ANS applicability to most materials, ability to create a wide variety of shapes from available
stock, ability to achieve close tolerances, and ability to achieve good surface finish
List four parameters of machining that are included within the scope of "cutting conditions." -
ANS Cutting speed, feed rate, depth of cut and use of cutting fluid.
Identify three desirable properties of a cutting tool material. - ANS Toughness, hot hardness
and wear resistance
What criteria are commonly used to assess a production machining operation? - ANS Tool
wear/life, machine forces and power, surface finish, tolerances and ease of chip removal
Why are surface and cylindrical grinding processes technologically and commercially
important? - ANS fine surface finish and very close tolerance
Describe knurling and its application. - ANS A diamond shaped criss cross pattern turned or
rolled into a surface to increase grip-ability. It is done on a lathe.
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, What material is commonly used as an abrasive in grinding wheels? - ANS aluminum oxide
What does the designation "12 in. x 36 in." mean in reference to a lathe? - ANS size of bed =
swing over bed * distance between centres.
Which abrasive material is most appropriate for grinding hardened steel? - ANS Aluminum
oxide
What are the two materials known as "Super Abrasives? - ANS Carbon Boron Nitride and
Polycrystalline Diamond.
What is meant by the term "carbon seeking" for Super Abrasives? - ANS Polycrystalline
diamond breaks down due to carbon seeking effect when used to machine hardened steel
Name the three types of cutting fluid according to chemistry. - ANS Natural (petroleum, fat,
or vegetable based), emulsified (oil with water) and chemical (no oil)
Name the three most common machining processes. - ANS Turning, milling and drilling
How is feed rate denoted for a manual lathe and drill press? - ANS Manual lathe = feed/rev
Drill press = inches/rev
What is barstock? - ANS Strips of raw purified material
What is a blind hole? What do we not like about a blind hole? - ANS 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
What do counterbore and countersink have in common? - ANS Both allow head of fasteners
to be flushed with the workpiece
3 | Page @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
100% CORRECT ANSWERS | LATEST
VERSION 2025/2026.
What is the formula for RPM? - ANS (cutting speed*12)/piD
What is the formula for feed rate? - ANS RPM * chip load * number of teeth
Describe broaching and provide an example of its application. - ANS A broach is a cutting tool
with teeth increasing in size going from rough to fine cutting. Cutting a rectangular key slot
A cutting edge that can hold up under high temperatures experienced at the chip-tool interface
possesses a quality called what? - ANS Hot Hardness
Reaming is used to? how? - ANS Improve tolerance on a drilled hole. By widening/boring a
hole with high accuracy
Which metal cutting condition has the greatest effect on tool wear? - ANS Cutting Speed
Describe/Sketch the difference between climb (down) milling and conventional (up) milling. -
ANS Conventional: Piece moves with the rotation of blade (No backlash)
1 | Page @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
,Climb: Piece moved against rotation of blade (Backlash if old machine, better finish, improves
tool life.)
Describe the difference between peripheral milling and face milling. - ANS Peripheral =
spindle is parallel to cutting surface.
Face = spindle is perpendicular to the cutting surface
What is a procedure applied to worn grinding wheels to expose fresh abrasive grit and remove
chips that have clogged the wheel? - ANS Dressing
This procedure is similar to dressing, but also restores the ideal cylindrical shape of the grinding
wheel. What is it called? - ANS Truing
State three reasons that machining is commercially and technologically important. -
ANS applicability to most materials, ability to create a wide variety of shapes from available
stock, ability to achieve close tolerances, and ability to achieve good surface finish
List four parameters of machining that are included within the scope of "cutting conditions." -
ANS Cutting speed, feed rate, depth of cut and use of cutting fluid.
Identify three desirable properties of a cutting tool material. - ANS Toughness, hot hardness
and wear resistance
What criteria are commonly used to assess a production machining operation? - ANS Tool
wear/life, machine forces and power, surface finish, tolerances and ease of chip removal
Why are surface and cylindrical grinding processes technologically and commercially
important? - ANS fine surface finish and very close tolerance
Describe knurling and its application. - ANS A diamond shaped criss cross pattern turned or
rolled into a surface to increase grip-ability. It is done on a lathe.
2 | Page @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, What material is commonly used as an abrasive in grinding wheels? - ANS aluminum oxide
What does the designation "12 in. x 36 in." mean in reference to a lathe? - ANS size of bed =
swing over bed * distance between centres.
Which abrasive material is most appropriate for grinding hardened steel? - ANS Aluminum
oxide
What are the two materials known as "Super Abrasives? - ANS Carbon Boron Nitride and
Polycrystalline Diamond.
What is meant by the term "carbon seeking" for Super Abrasives? - ANS Polycrystalline
diamond breaks down due to carbon seeking effect when used to machine hardened steel
Name the three types of cutting fluid according to chemistry. - ANS Natural (petroleum, fat,
or vegetable based), emulsified (oil with water) and chemical (no oil)
Name the three most common machining processes. - ANS Turning, milling and drilling
How is feed rate denoted for a manual lathe and drill press? - ANS Manual lathe = feed/rev
Drill press = inches/rev
What is barstock? - ANS Strips of raw purified material
What is a blind hole? What do we not like about a blind hole? - ANS 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
What do counterbore and countersink have in common? - ANS Both allow head of fasteners
to be flushed with the workpiece
3 | Page @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
