Chapter 1-14 review CNC

Dimensions are always given in US customary units.

False

Dimensions that have unspecified tolerances are dimensions without tolerances.

False

Generally, the number of views included on a multiview drawing is four.

False

Gloves should be worn around a moving spindle when removing chips.

False

Grinding is a cutting rather than an abrasive process.

False

If a calipers' smallest delineation is .001″, its precision is half of that, or ±.0005″.

False

In CAM software lathe operations, there are options to create 3-axis milling but not drilling functions.

False

In a vertical machining center, the machine spindle does not hang away from its support system, so it is more rigid in design.

False

In the insert naming convention, the letters represent insert size and the numbers represent insert shape.

False

In today's manufacturing environment, CNC programmers no longer require knowledge of computer-aided manufacturing systems.

False

Inserts can have a hole through the center to secure a second insert into the first.

False

It is a common practice to remove chemicals from their original storage containers.

False

It is not possible at present to incorporate the WIPS routines into a main program.

False

It is not possible for a machine to have more than three axes of movement.

False

It is not possible to go from a main program to a subprogram and then into a different subprogram.

False

John Wilkinson is widely regarded as the "Father of CNC."

False

Just-in-time delivery describes a process that utilizes workflow and process control to limit the resources used in creating a finished product.

False

Lines that indicate a feature that is not on a normal external side of a part are known as cutting plane lines.

False

Metal chips are most often separated at the recycling facility.

False

Mill-turn machines are powerful but will never replace the 3-axis lathe setup.

False

Modal commands turn themselves off.

False

Most CNC turning centers are oriented vertically.

False

Most steel is machined in a hardened state.

False

NIMS formed to develop a set of credentials for professionals from all technical fields.

False

Naming conventions for inserts call for a series of four letters and four numbers.

False

Negotiation is the process of agreeing on an issue that requires one party to give and one party to take.

False

Non-US machines use a VDI taper.

False

On a CNC turning center, going toward the spindle is defined as the positive Z or Z+ direction.

False

Pocket entry strategy is choosing whether to enter from off the material or dive directly into the part.

False

Production of aircraft and naval vessels in the United States ceased at the end of WWI.

False

Programs must begin in the main program but can end in a subprogram.

False

Safety data sheets are one type of personal protective equipment.

False

Semiprecision measurement is any measurement greater than .001″ or 1° of accuracy.

False

Sharp tools should be laid out on a work surface with the sharp end facing toward you.

False

Taps are tools specifically designed to create relief angles or clearance diameters for bolt and screw heads.

False

The G82 drill cycle simply travels to a Z depth and then returns.

False

The G83 cycle sends the drill to a specified depth and then partially retracts to break any chips.

False

The binder jetting process uses thermal energy to fuse material.

False

The code for each tool within a program does not have a closing statement.

False

The distance across a circle through the center point is called the radius.

False

The feed rate should be slower for an end mill with more flutes.

False

The goal of cellular manufacturing is to allow customers to receive products only when they need them.

False

The head-table design is not used in larger part manufacturing because of its reduced clearance.

False

The longhand threading method substantially decreases the opportunity for programmer error.

False

The most common manual machine is the drill press.

False

The probe of a CMM should never touch the surface of a part.

False

The process of stacking gage blocks together is known as righting.

False

The upper and lower limits of a bilateral tolerance must be equal.

False

There are machine specific G codes but no machine specific M codes.

False

There are no CNC turning centers that come with both dual-spindle and dual-turret configurations.

False

There are outside micrometers and inside micrometers, but there are no depth micrometers.

False

To use the Extrude tool, the exterior shape and the axis of rotation must be defined.

False

Tools not currently being used by a CNC machining center are brought to the ready position by the workholder.

False

Turning centers with additional live tooling features have more travel range and horsepower than mill-turn machines.

False

Turning toolholders have more diversity and options than milling toolholders.

False

Warpage is never a problem with additive manufacturing technologies.

False

When choosing a toolpath, the first step is to decide on the tool required for the cut.

False

When contouring, the tool should be driven straight down the edge of the contour.

False

When creating a five-axis toolpath, generally there is only one strategy or toolpath that will work.

False

When creating grooves, best practice advises using a grooving tool that is the same size as the desired groove.

False

When subtracting two numbers with a common numerator, subtract the two denominators.

False

While different grades of steel have very different characteristics, all grades of aluminum are quite similar.

False

With chip break peck drilling, the drill retracts completely each cycle.

False

With the helical cutter entry method, feed rates are increased upon entry and then turned down once depth is achieved.

False

Work coordinate systems should be overridden in the subprogram.

False

Workholding is not a critical decision in the preprogramming phase.

False

In which form of additive manufacturing does a roller or vibrating blade spread layers of a metal powder across a build platform?

Powder bed fusion

Although the configuration of a horizontal machining center may vary, the Z axis direction is always oriented through the spindle centerline.

True

Always take five seconds before operating any piece of equipment to check your equipment and the surrounding environment.

True

An obtuse angle is larger than an acute angle.

True

Any time there are more axes of movement than standard in a mill or lathe, it is considered multiaxis.

True

Automatic tool changers can hold several hundred tools.

True

CAM program files can be created as a variety of different file types.

True

CNC controllers do not know how long a tool extends from the holder without the programmer defining this dimension.

True

Class B fire extinguishers use dry chemicals or carbon dioxide.

True

Codes M10 and M11, which are used to clamp and unclamp chuck jaws, will only work with the spindle stopped.

True

Cutter compensation is compensation for the diameter of the tool.

True

Cutting angles requires moving along two axes simultaneously. This can be performed in the X and Y, X and Z, or Y and Z directions.

True

Dimension lines usually have arrowheads on each end that point to extension lines.

True

Dimensions can be given in both fractional and decimal formats.

True

Early machining jobs were difficult and often resulted in injuries.

True

Efficiency is important for programming, fixturing, and inspection.

True

End mills are the most common cutting tool in milling.

True

Feeler gages are used to determine a gap or space in a part or between two parts.

True

For CNC lathing operations, toolholders are not as important as selecting the correct insert.

True

G codes can be used to command canned cycles.

True

Go/no-go gages are used to measure the high and low limits of a thread specification.

True

Grinding is one of the most precise techniques for metal removal.

True

Height gages can be used to check features like flatness, parallelism, perpendicularity, and concentricity.

True

If a preferred format is not given, it is best to save an online application in document or PDF file format.

True

In the Hazardous Materials Identification System (HMIS) ratings, red is the color designation for a material's flammability.

True

In the WIPS system, the Hand Jog tab can be used to manually position the probe before starting.

True

It is always a good idea to assemble a team when preparing to program a part.

True

It is mandatory to use a threading canned cycle when trying to create outside diameter threads.

True

Lead is a serious environmental hazard if not disposed of properly.

True

Modern CNC routers are full 3-dimensional milling machines.

True

Most programmers doing multiaxis machining will set the Z or tool height offset at the center of rotation.

True

On a CNC machining center, the spindle secures a tool holder in place and rotates cutting tools.

True

On a micrometer, the thimble rotates around the barrel and has a secondary measuring scale.

True

Only plastic can be printed using vat photopolymerization.

True

Parts for modern machines can be tested for form and fit without producing physical prototypes.

True

Polycrystalline diamond is made using extremely high heats and pressures.

True

Robots can be remotely controlled by a human or programmed using computer software.

True

SOHCAHTOA is a helpful mnemonic for remembering the definitions of sine, cosine, and tangent.

True

Safety data sheets are prepared by the manufacturers of hazardous chemicals.

True

Simple part geometry can be created within CAM software.

True

Soft skills are desirable qualities that include communication skills and leadership.

True

Solids and surfaces are two ways to define 3-dimensional features.

True

Some machining processes require the use of flammable oils.

True

The Cartesian coordinate system specifies each point uniquely in a plane with a pair of alphanumeric coordinates.

True

The G70 and G71 stock removal cycles can be used for both outside diameter and inside diameter cutting.

True

The G83 cycle is specifically used for drilling deep holes.

True

The HMIS rating system was created by the American Coatings Association.

True

The Industrial Revolution could not have occurred without measuring tools.

True

The US standard for a milling toolholder is called a CAT taper.

True

The automatic tool changer on a CNC turning center is called a turret.

True

The best CNC machining instructors come from inside the industry.

True

The code line G65 P9832 turns a probe on.

True

The denominator is the number on the bottom of a fraction.

True

The flute of a drill bit allows chips to be removed during the drilling process.

True

The hypotenuse is the longest side of a right triangle.

True

The length of a sine bar is defined as the center-to-center distance between the two cylinders.

True

The most common tool setting method is to set all tools to the spindle centerline in X and to use the face of the finished part as the Z-axis 0.

True

The most important task for a CNC machine operator is inspecting products as they are made.

True

The most significant improvement in modern machining is safety.

True

The number of calculations required to create a full 5-axis path cannot be done without a high-end computer system with advanced CAM software.

True

The operation of parting off is usually used in the creation of smaller parts from a length of bar stock.

True

The standard CNC machining center has three axes of movement, the X, Y, and Z.

True

The third number in an insert name designates the radius on the nose of a tool.

True

The three main components to reading calipers are the edge, scale, and dial.

True

The three main subsystems of a flexible manufacturing system are the machines, the material handling system, and the central control computer.

True

True full 5-axis milling means that the A or B axes are moving while the tool is engaged in an X-, Y-, or Z-axis movement.

True

Using a high-pressure water jet is an effective method of cutting steel.

True

Vernier measurement tools have no dial, readout, or electronics.

True

When a machine is initially started up and zero returned, it travels to its machine home position.

True

When a tool should follow a set of connected geometry, the contour toolpath is the most commonly used cycle.

True

When setting a probe for a bore measurement cycle, the line must contain an approximate hole diameter.

True

When using WIPS to probe for outside corners, you must designate which corner you want to probe.

True

With a CAM system, a toolpath is associated with the geometry.

True

With fused deposition modeling, a spool of plastic line is threaded through an extruder.

True

With plasma cutting, only materials capable of carrying an electric charge can be cut.

True

All 5-axis machines have a point in space called the _____, where all rotation centerlines intersect.

center of rotation

When taking a bore measurement with a probing system, the _____ of the probe sphere must be _____ the top face of the bore.

center, below

With full-axis engagement, the centerline of the tool will stay oriented through the _____ of the part.

centerline

Proper tool_____, the angle and depth of the tool as it makes a cut, is very important.

engagement

Micromachining is the process of manufacturing _____.

extremely small parts

With a CNC turning center, _____ describes machining the front of a part.

facing

Small arcs that blend two intersecting lines are called _____.

fillets

A deep hole is defined as any hole that is at least _____ times deeper than the diameter of the drill.

four

Naming conventions for inserts call for a series of _____.

four letters and three numbers

Lathes that use a _____ configuration to hold tools can perform extremely fast tool changes but cannot accommodate a tailstock.

gang tool

The _____ stores all of the different tool selections and parameters in a hidden file for the post-processor to use.

generic machine code file

A gage block's _____ establish and identify the precision and quality of the block set.

grades

Making sure that customers receive products only when they need them is called _____.

just-in-time delivery

John Wilkinson developed what is considered to be the first _____.

lathe

The ability to use multiple machines to perform the same operation on a part is called _____.

machine flexibility

The most common way to orient a part in orthographic projection is a _____-angle projection.

third

When creating a pocket, a tool with a diameter _____ the fillet diameter should be used.

smaller than

The term _____ holder refers to a toolholder built for a specific-size tool.

solid body

The development of _____ enabled the production of repeatable parts.

steam engines wrong

On a CNC turning center, the movable or programmable device that provides longitudinal support to a workpiece is called a _____.

tailstock

The sine of a given angle is the ratio of _____.

the opposite side to the hypotenuse

A tabular dimension can used to simplify dimensions on a crowded print.

True

Almost all turning tools use _____ inserts.

carbide

Which of the following is generally not used to cut ferrous materials?

Polycrystalline diamond

Which of the following might you find in a "Right to Know" station?

Safety data sheets

The HMIS rating system rates hazardous materials on a scale of _____.

0 through 4

How many M codes can be used on each line of a program?

1

What is the complementary angle for a 45° angle?

45 degrees

What is the supplementary angle to a 125° angle?

55°

What is the most important item used to protect oneself from chips when machining?

Safety glasses

After a programmer receives a CAD file, decides on the correct machining approach, and creates the necessary toolpaths, the job is complete.

False

An isosceles triangle has all equal angles.

False

Associated geometry in CAM systems often increases programming and set-up errors.

False

CAD drawings require scaling.

False

Class A fire extinguishers are for use on oil fires.

False

Clothing made of polyester fabric is generally preferred in the machine shop.

False

Codes G20 and 21 are canned cycle commands.

False

Common components of a milling machine include a chuck, turret, and gearbox.

False

Precision measurement is defined as any measurement smaller than _____ or less than 1° of accuracy.

.005″

Solve for 3/16 - 5/32. Reduce as necessary.

1/32

A multiaxis machining center is a machine with more than _____ axes of travel.

3

Solve for 5 1/8 - 2 1/16. Reduce as necessary.

3 1/16

A good rule of thumb is to measure with a tool _____ times more accurate than the dimension.

4

Views created using orthographic projection are offset by _____ from one another.

90°

Which of the following materials can be cut by a plasma cutter?

Aluminum

Which of the following questions do you not need to answer during an interview?

Are you married?

In which part of the program are all the tools and movements to create a part defined?

Body

Nonverbal skills include which of the following?

Body language

This type of tap is used when tapping a blind hole, or a non-through hole, where the threads extend down the entire hole depth.

Bottom

An electrical fire is categorized as a type _____ fire.

C

To make a turning center into a multiaxis machine, the spindle can be oriented and locked in place; this is called the _____.

C axis

_____ is the process in which machining parameters are defined using computer software.

CAM

The US standard for milling toolholders is called a _____ taper.

CAT

Measurement with this tool can be influenced by the operator squeezing it too tightly or not aligning it properly.

Calipers

Where is the only place in a CNC program that you will find the letter "O"?

Opening statement

Which of the following shapes is not a polygon?

Circle

Which measuring tool comes in a go/no-go style?

Comparison gage

Which of the following should not be used to remove chips from a machine?

Compressed air

Which of the following does not allow a tool to re-enter the threads at the same starting position??

Cross threading

Flaming magnesium would be categorized as a type _____ fire.

D

What does the default block of a CNC program do?

Defines all tools.

3D printing is often used in critically engineered parts.

False

A 155° angle and a 25° angle are complimentary.

False

A drill press is more accurate than a milling machine.

False

A fillet gage is used to verify pitch on a threaded piece.

False

A list of references should be included with each résumé you send out.

False

A tap, like a drill, can be used to create a hole.

False

A third-angle projection establishes the size of the part in the print.

False

Additive manufacturing will replace CNC machining in the near future.

False

This type of gage is precut with radii or partial arcs.

Fillet

Carbon dioxide fire extinguishers can be used on which types of fires?

Flammable liquids and electrical

Preparatory command refers to address codes that begin with the letter _____.

G

The commands for cutter offsetting can be found in the _____.

G codes

Until recently, there were no _____ in a lathe.

G54-G59 work coordinates

What code tells the machine that it is in probing mode?

G65

Which of the following machining operations is most likely to require the use of a respirator?

Grinding

_____ is widely regarded as the father of machine tool technology.

Henry Maudslay

_____ lines are drawn as a medium-weight dashed line.

Hidden

A process for creating arcs that often works with older machine controllers is the _____.

I, J, and K method

A newer file format developed specifically by a CAD company to convert its files out to other systems is the _____.

Initial Graphics Exchange Specification (IGES) wrong

Which of the following is a typical task of a CNC machine setup operator?

Installing fixturing into a machine tool

What does a rating of 1 on the HMIS system mean?

Irritation or minor reversible injury.

Who created the first true numerically controlled machine?

John Parsons

Which of the following should not be included in a letter of application?

List of references

Which of the following is not an advantage of automation?

Lower initial costs

Which letter code can best be described as a switch?

M

The code that tells the machine to go to a subprogram is _____.

M98

Subprograms are looped back to the main program with a(n) _____ command.

M99

Which of the following actions is part of the five-second rule?

Make sure the machine is in the correct starting position.

Remote operated vehicles are a good example of which type of robot?

Manual robot

The 3D printer found in the hobby market uses which form of additive manufacturing?

Material extrusion

When probing, every nonmeasurement move in the program should use what code?

P9810

In CAM software, after choosing a drill cycle, cutting depth is set on the _____ page.

Parameters

Which of the following would be the best choice for an insert when cutting a ferrous material of 60 RC?

Physical vapor deposition wrong

The peck depth is entered using the letter _____.

Q

Which of the following positions would be most likely to operate a coordinate measuring machine (CMM)?

QC inspector

This type of dimension appears in parenthesis and should not be used to manufacture parts.

Reference

A box drawn in the corner of a triangle indicates which type of triangle?

Right

_____ are used in conjunction with gage blocks to measure angles.

Sine bars

In which of the following machines are tools fixed in place on a slide while a bar is pushed into the tool?

Swiss

A tool that is perpendicular to the surface being machined is normal to the surface.

True

A vertical band saw uses a blade that is oriented perpendicular to the floor.

True

On a micrometer, which part screws up and down to secure the second side of a piece being measured?

Spindle

After 3D-printing applications, parts often need to be remachined because of their rough finish.

True

All CNC turning centers have four major components: a spindle, an automatic tool changer, a tailstock, and a controller.

True

A smaller relief angle makes the cutting edge of an insert more stable or rigid, allowing for heavier cuts.

True

A solid model is a 3-dimensional CAD model that has mass and volume.

True

A coordinate measuring machine inspects a part but does not cut.

True

A cube is not a polygon.

True

A micrometer is a tool designed to take small exact measurements.

True

A pocket can include internal components that are not meant to be machined.

True

A résumé should contain an outline of your education, work experience, and other qualifications.

True

Which of the following is not a basic component of a CNC machining center?

Turret

Stereolithography and digital light processing are two types of which of the following additive manufacturing forms?

Vat photopolymerization

Which of these lines define the part shape or surface of an object?

Visible lines

On the Diameter Offset page, the _____ column is where small adjustments can be made to the offset after the part is machined and measured.

Wear

Which of the following tasks is not a typical duty of a machine operator?

Writing code for the CNC machine

The diameter offset establishes the _____ coordinate for each tool.

X-axis

The _____ axis in all milling machines is through the centerline of the spindle.

Z

When taking a boss measurement, the probe must go in the _____ direction to find the boss diameter.

Z-

Manufacturing jobs earn _____.

above average pay

3D printing is a type of _____.

additive manufacturing

Using a CNC laser in sheet metal fabrication can _____.

allow shapes to be cut to extremely small tolerances

Views that show parts oriented at an angle other than 90° are referred to as _____.

auxiliary views

The first step in preventing an injury with an oil spill is to _____.

block the area

Repetitive amounts of machine code can be reduced by using _____.

canned cycles

In a lathe, the material is often secured in a set of jaws called a _____.

chuck

Which of the following is not a common component of a milling machine?

chuck

A(n) _____ toolpath is used to direct a tool along a specific set of lines or arcs.

contour

The G2 and G3 codes are used for _____.

creating arcs

In a(n) _____ micrometer, the spindle extends down from the anvil.

depth

Cutter compensation compensates for the _____ of the tool.

diameter

A _____ is commonly attached to a magnetic base used in CNC lathes.

drop indicator

The difference between the drill cycle and the spot drill cycle is that a _____ is added.

dwell

Bench, pedestal, and outside diameter are all varieties of what tool?

grinder

Chatter and vibration are often called _____.

harmonics

Peel Mill, Dynamic Mill, and Dynamic Contour are all examples of _____.

high-speed machining

A number where the numerator is greater than the denominator is called a(n) _____.

improper fraction

The most common method for programming the feed rate for CNC lathes is in _____.

inches per revolution

Use of CNC technology in the woodworking industry has done all of the following except _____.

increase costs

Each of the following is a strategy for cutter entry except _____.

incremental positioning

The first number in the insert naming system identifies the _____.

inner-circle size

What type of grinder requires an existing hole in the piece being worked?

inside diameter

It is important to make sure that your résumé _____.

is error-free

With _____, drops are deposited layer by layer onto the build platform to form a 3D part.

material jetting

Cloth rags used to clean up metal shavings and oil _____.

may spontaneously combust

The _____ is the most versatile manual piece of manufacturing equipment.

mill

A _____ holds objects in place when milling by clamping a workpiece firmly between its jaws.

mill vise

The G02 and G03 commands are _____.

modal commands

The most common way to describe a 3-dimensional part in a 2-dimensional drawing is with _____.

multiview drawings

The difference between a CMM and a CNC machine is that a CMM has a _____ that touches a surface of a part.

probe

Surfaces have _____.

no thickness or mass

The forces in a _____ cut are driven through the tool centerline, toolholder, and spindle.

normal

Any information contained in parentheses is _____ by the machine.

not read as code

With 3 + 1 milling, an additional axis is called a rotary because it rotates around _____.

one axis

Surface footage is the number of linear feet a location on a rotating component travels in _____.

one minute

The G81 code is a _____ cycle.

oops

A _____ drilling cycle drives the tool down to a partial depth and then fully retracts above the part to remove chips and allow coolant to enter.

peck

The G83 code is a _____ cycle.

peck drill

Before using someone as a reference, you should always get that person's _____.

permission

Titanium carbonitride, titanium nitride, and titanium aluminum nitride are widely used as _____ coatings.

physical vapor deposition

Workholding is a decision that must be made in the _____ phase.

planning

Often called a teach-programmed robot, one of the two most common robots in machining is the _____ robot.

playback

By itself, a(n) _____ cannot be toolpathed.

point

A(n) _____ is a dimension that references a distance and an angle.

polar coordinate

A _____ employee is always prompt and on time.

punctual

A bolt circle is created using a series of points that have a common _____ from a center point.

radius

Which of the following is not a component of a lathe?

ram

A shape that has four equal sides but no right angles is called a _____.

rhombus

With a head-table design, the table _____ and the entire spindle cartridge rotates around a fixed location.

rotates

All grinding wheels come with a listed maximum _____.

rpm

An optical comparator uses the _____ of a part to magnify and measure features.

shadow

Because layers are formed and stacked, _____ only provides strength in a single direction.

sheet lamination

Full 3-axis turning is the process of moving a primary axis _____ a secondary axis.

simultaneously with

The thousandths place is _____.

three places to the right of the decimal

Identifying information about a part and print can be found in the _____.

title block

The third letter in the insert naming system identifies the _____.

tolerance

The difference between a CNC mill and a CNC machining center is that a CNC machining center has an automatic _____.

tool changer

Adding a _____ to a 3-axis machine can turn it into a 5-axis machine.

trunnion

Use of a _____ can convert a 3-axis machining center to a 5-axis machine.

trunnion

Carbide is made of a mix of carbon and _____.

tungsten

A computer-controlled lathe fitted with an automatic tool changer is a CNC _____.

turning center

Fire extinguishers should be inspected at least _____ for service and usability.

twice a year

The term _____ drill generally refers to any solid body drill bit.

twist

A(n) _____ tolerance describes a dimension with tolerance in a single direction.

unilateral

In a _____ machining center, chips stay inside the work envelope and can interfere with the cutting edge.

vertical

Magnesium dust and chips are flammable, especially in the presence of _____.

water