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Worksheets12/21/2023 CNC machines
Total questions: 92
Worksheet time: 46mins
What year were CNC machines introduced into U.S Manufacturing
1981
1978
1989
1979
Who developed the First CNC used by the U.S Air Force
USC
LSU
MIT
Harvard
What is the difference between a NC and CNC machine?
The way they are coded and memory
how they are ran
who owns them
machinist that use them.
Who was know as the father of the CNC machine?
John Parson
Eli Musk
Steve Jobs
Henry Ford
When was the first NC machine developed?
1981
1973
1945
1952
A NC machine used what type of memory?
RAM
Punch cards
G coding
manual controls
CNC now comes with how many axis?
5
1
3
16
What type of coding does a CNC machine use?
G and M codes
Q codes
Bar codes
No codes
What does NC stand for?
Never mind
Numerical Controls
Number calculator
What does CNC stand for?
Computerized Numerical Controls
Computer memory calculations
Carry my note book?
Specifies the position/location of points uniquely in a plane by a pair of numerical coordinates, which are the signed distances to the point (origin 0,0) from two fixed perpendicular directed lines, measured in the same unit of length.
Computer-Integrated Manufacturing (CIM)
Axis
Cartesian coordinate system
3-D (Three-dimensional)
The automation of machine tools by means of computers executing pre-programmed sequences of machine control commands among multi-axis coordinate planes.
Computer Numerical Control (CNC)
Computer Alphabetical Control (CAC)
Computer Cryptographic Control (CCC)
Machinery that has sensing and control devices that enable it to operate automatically.
Manual
Biotech
Nanotechnology
Automation
Computer-Aided Drafting (CAD) is the making of a set of construction drawings with the aid of a computer.
True
False
What does CNC stand for?
Computer nuance controll
Controll national computer
Computer numerically controlled
Computer numerical creation
How many axis do CNC machines generally operate on?
1 or 2
3 or 6
2 or 3
3 or 5
CNC machining is
additive manufacturing.
subtractive manufacturing.
3D printing is
additive manufacturing.
subtractive manufacturing.
When were the first CNC machines developed?
1980/90s
1940/50s
1880s
1950/60s
CAM software does?
Allows designer and engineers to create 3D models of parts and products that they want to create.
Converts and a CAD model into G and M code so that a CAM machine can make the design.
Converts photographs into 3D CAD models for later development into finished parts or products.
Drills and mills work by?
Rotating a tool/bit which comes into contact with material.
Rotating material which comes into contact with a stationary cutter or tool.
Lathes work by?
Rotating a tool/bit which comes into contact with material.
Rotating material which comes into contact with a stationary cutter or tool.
CNC machines are?*
Computerised numerical controlled machines used to create products or parts from solid blocks of material.
Computerised numerical controlled machines used to create products or parts from liquid material.
Computerised numerical controlled machines used to create products or parts from solid blocks of meat and metals.
Computerised numerical controlled machines used to create products or parts from solid blocks of earth.
What does CAD stand for?
Code and Design
Computer Aided Design
Create and Design
Craft and Design
What does CAM stand for?
Carefully Added Material
Computer Aided Manufacture
Computer Aided Making
Careful Addition Manufacture
What is CAD?
An app that lets you analyze different design concepts
A coding program to let you easily write in a computer language
Computer software used to create 2D drawings/3D models of designs
Creation and development for any robot
Two types of dimensional systems.
Open and close loop
Absolutely and incremental system
Sub and end program
Single and double cut
System using computer technology to control production processes and equipment.
Computer-Aided Manufacturing (CAM)
Industry
Gadget
Cartesian coordinate system
Specifies the position/location of points uniquely in a plane by a pair of numerical coordinates, which are the signed distances to the point (origin 0,0) from two fixed perpendicular directed lines, measured in the same unit of length.
Computer-Integrated Manufacturing (CIM)
Axis
Cartesian coordinate system
3-D (Three-dimensional)
Manufacturing program that combines automation with manual tasks.
Vector
MIG Welding
TIG Welding
Computer-Integrated Manufacturing (CIM)
The automation of machine tools by means of computers executing pre-programmed sequences of machine control commands among multi-axis coordinate planes.
Computer Numerical Control (CNC)
Computer Alphabetical Control (CAC)
Computer Cryptographic Control (CCC)
Machinery that has sensing and control devices that enable it to operate automatically.
Manual
Biotech
Nanotechnology
Automation
Computer-Aided Drafting (CAD) is the making of a set of construction drawings with the aid of a computer.
True
False
XYZ origin arrows can be toggled on and off in the 3D View to show exactly where the X0, Y0 and Z0 origin is position is relative to the material.
Draw Origin
Centerpoint
Centerline
Original Point
How many axis do CNC machines generally operate on?
1 or 2
3 or 6
2 or 3
3 or 5
CNC machining is
additive manufacturing.
subtractive manufacturing.
3D printing is
additive manufacturing.
subtractive manufacturing.
When were the first CNC machines developed?
1980/90s
1940/50s
1880s
1950/60s
CAM software does?
Allows designer and engineers to create 3D models of parts and products that they want to create.
Converts and a CAD model into G and M code so that a CAM machine can make the design.
Converts photographs into 3D CAD models for later development into finished parts or products.
A 3-axis machine will move in?
The X, Y, Z axes.
The X, Y, 3 axes.
The L, R, B axes.
A 5-axis machine can move in?
The X, Y, Z axes.
The X, Y, Z, R, T axes.
The X, Y, Z, and two seperate rotational axes.
What axes are there on the Haas SL20 lathe in the CNC workshop
X & Y
X & Z
Y & Z
X, Y & C
What is a difference between vector and raster images?
vectors have lower image resolution when enlarged
vector = line art and raster = pixels
vectors are more commonly large files
What are the 3 most common axes used in automation motion control?
A, B, C
top, front, right
X, Y, Z
What is the most common place to set as the home position (zero position) for machining material?
bottom left
top left
bottom right
top right
What is “G code”?
computer code used to direct CNC machines
the code that the 3D printers read
the file extension that Aspire files save as
What is plunge rate?
speed at which the spindle moves left to right across the material
speed at which the spindle rotates
how fast and deep the tool goes into the work piece
What does the term “speed” refer to in CNC?
how quickly the machine parts move
how quickly you put the material in the machine
how quickly the parts of the machine turn off
What function do you use to edit vector images that are imported from a source?
trace bitmap
node edit
create toolpath
CNC
a machining tool that uses a rotational cutting tool to remove material from a moving work piece
software that is used to create standardized design
machines used in all manufacturing fields and numerically directed by a computer
a program that uses numerically coded instructions to tell the machining tool where to move
CNC machines
machines whose operations are directed by the machine control system, the instructions written in the program in the form of alphanumeric symbols
a program that uses numerically coded instructions to tell the machining tool where to move
machines that automatically references position and work piece origin to maintain accuracy
CAM
a program that uses numerically coded instructions to tell the machining tool where to move
software that takes a drawing file from a CAD program, adds variables and creates the nc code used to run the machine
describes the directions of the tools, which are set by the size of a tooling part and the approaches and departures of a tool to a work piece
CAD
software that is used to create standardized design
software that takes a drawing file from a CAD program, adds variables and creates the nc code used to run the machine
a program that uses numerically coded instructions to tell the machining tool where to move
numerical control program
the reference position on the stock relative to which the work coordinates are set
describes the directions of the tools
a program that uses numerically coded instructions to tell the machining tool where to move
spindle
the speed at which the tool moves through the stock
a component of the CNC machine that rotates the cutter or work piece
a machining tool that uses a rotational cutting tool to remove material from a moving work piece
feed rate
the speed at which the tool moves through the stock
a component of the CNC machine that rotates the cutter or work piece
a machining tool that uses a rotational cutting tool to remove material from a moving work piece
geometrical
at right angles to
describes the directions of the tools
the reference position on the stock relative to which the work coordinates are set
perpendicular to
at right angles to
describes the directions of the tools
the reference position on the stock relative to which the work coordinates are set
origin (work piece origin)
the reference position on te stock relative to which the work coordinates are set
at right angles to
a machining tool that uses a rotating tool to remove material from a surface
mill
machines whose operations are directed by the machine control system
a machining tool that uses a rotational cutting tool to remove material from a moving work piece
a machining tool that uses a rotating tool to remove material from the surface of a stationary workplace
machine reference position
a constant relative position to other positions defined by the machine manufacturer
the reference position on the stock relative to work coordinates set
software that sets variables from CAD program
router
a machining tool that uses a rotational cutting tool to remove material from a moving work piece
a machining tool that uses a rotating tool to remove material from the surface of a stationary workplace
a program that uses numerically coded instructions to tell the machining tool where to move
The CNC stands for
Computerized Numerical Control
Computerized Note Control
Controlled Numerical Computer
Computerized Number Count
What are the advantages of a CNC machine?
Reduced scrap rate
Higher flexibility
Improved quality
All of these
Which machine tools/ operations are basically handled and controlled by CNC
Lathe
Milling
Grinding
All of the above
In CNC machine tool, the part program entered into the computer memory
can be used again but it has to be modified every time
can be used again and again
cannot say
can be used only once
Why is CNC Machining necessary?
To manufacture complex shapes
High precision is required
To increase productivity
All of these
What is true about a CNC machine?
The slideways operate under high friction
Backlash is very high
CNC machines are more rigid than conventional machine
None of these
What is the advantage of a ball screw?
The power transmission efficiency is less
It is not self-locking screws
High levels of lubrication is required
The friction is very less
Preloading of ball screw is done to
reduce the friction
increase the friction
reduce the backlash
increase the backlash
A series of coded instructions required to produce a part in a CNC machine is known as
C program
part program
part line
end of block
MCU in CNC stands for
Manual Control Unit
Mobile Control Unit
Machine Control Unit
None of these
The function of MCU is
to write the part program
to read and decode the coded instructions
to edit the part program
to start the machine
In the CNC machine tool
the spindle rotates about Z-axis
the spindle rotates about Y-axis
the table moves along the Z-axis
the spindle rotates about X-axis
The position and speed transducers to continuously monitor the position at which the cutting tool is located at any particular instant are the part of
Part program
Machine Control Unit
Feed Back System
None of these
A drive system consists of
amplifier circuits
drive motors
ball lead-screws
all of these
The essential requirement of a stepper motor is
the angular position of the rotor changes in steps
the rotation of the rotor is continuous
the friction is very less
none of these
What is the use of POS key?
To check the X-coordinate and Y-coordinate
To stop the spindle
To change the tool
To end the program
The INPUT key is used to
change any value in the part program
change the tool
enter the codes from USB to machine
start the spindle
The SYSTEM key is used
to load the part program
to edit the part program
to switch off the machine
by PLC programmer for setting in the machine
PLC stands for
Programmable Logic Computer
Programmable Logic Controller
Primary Logic Controller
Programmable Language Controller
The code used in a part program to define incremental mode is
G89
G90
G91
G92
The code used to define the absolute mode of a part program is
G89
G90
G91
G92
In which of the following operation, a point-to-point positioning system is used?
Milling
Drilling
Turning
None of these
The continuous positioning system is used in
Drilling
Punching
Milling
None of these
The method by which a machine tools move from one programmed point to the next is called
Translation
Interpolation
Transformation
Rotation
Each line describing a particular set of machining operations in a part program is called
Code
Address
Block
Word
G- codes are also known as
German function
Preparatory function
Miscellaneous function
None of these
The code used for linear interpolation is
G00
G01
G02
G03
The code used for circular interpolation in a clockwise direction is
G00
G01
G02
G03
The code used for tool change is
M00
M04
M05
M06
The spindle can be stopped using the code
M05
M06
M07
M08
