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Questions and Answers

What is the recommended way to prevent vibration when turning a long, thin workpiece?

  • By using a steady rest
  • By supporting the workpiece with a compound rest (correct)
  • By decreasing the feed rate
  • By increasing the spindle speed

    • Which of the following provides a quick way of making an accurate hole with a good surface finish?

  • Boring
  • Reaming (correct)
  • Threading
  • Drilling

    • What measurement must be used for a CNC lathe when doing a tapping operation?

  • SPFS
  • Frequency
  • RPM (correct)
  • SFPM

    • What is one of the hazards of applying too much pressure to the fasteners of components when machining?

    <p>The component may become deformed</p> Signup and view all the answers

    What is the recommended cutting speed SFPM for high speed steel drills when the workpiece material is Aluminium?

    <p>150</p> Signup and view all the answers

    In a CNC program, what does the G code G20 specify?

    <p>It specifies that all information must be in the imperial measurement system</p> Signup and view all the answers

    Which of the following is an important characteristic of a good quality cutting fluid?

    <p>All of the above</p> Signup and view all the answers

    What is the advantage of a side wheel grinder over a bench grinder?

    <p>It provides more precise control</p> Signup and view all the answers

    What type of lubrication system is used in a machine tool?

    <p>The enclosed circulating lubrication system.</p> Signup and view all the answers

    What does the term 'grit' refer to in grinding wheels?

    <p>The abrasiveness.</p> Signup and view all the answers

    How is an angle denoted with polar coordinates when measured counter-clockwise?

    <p>Positive.</p> Signup and view all the answers

    What does 'odd parity' mean in reference to CNC terminology?

    <p>Each program character is represented in rows containing odd number holes.</p> Signup and view all the answers

    What direction would you use to describe the direction toward the spindle centerline when working with a CNC machine?

    <p>Z</p> Signup and view all the answers

    What is a triangle with an angle greater than 90° called?

    <p>An oblique triangle.</p> Signup and view all the answers

    What is the taper per foot of a taper with D=14, d=2, and TL=10?

    <p>14.4</p> Signup and view all the answers

    What is the circumference of a circular hole with a diameter of 35.6 mm?

    <p>111.8 mm</p> Signup and view all the answers

    What is the term 'swing' related to in a lathe?

    <p>The largest diameter of workpiece that can be supported over the ways</p> Signup and view all the answers

    What is the common taper found on drills over 1/2 inch?

    <p>Type D-1 and type L</p> Signup and view all the answers

    If 1 inch is equal to 25.4 mm, what is the value of 125 cm in inches?

    <p>49.21</p> Signup and view all the answers

    What does the letter 'T' stand for in CNC programming?

    <p>Tool index</p> Signup and view all the answers

    What is the advantage of using a taper attachment over a compound rest for cutting tapers?

    <p>Mating tapers are easily produced with only two taper set-ups</p> Signup and view all the answers

    In the diagram, if x is equal to 62 units and y is equal to 45 units, what is the value of angle ?

    <p>48°</p> Signup and view all the answers

    Which of the following represents the ANSI standard material section for plastic?

    <p>#2</p> Signup and view all the answers

    Where does the compound rest on a lathe?

    <p>To the left of the cross-slide</p> Signup and view all the answers

    What is the angle most often used to draw isometric drawings?

    <p>45 degrees</p> Signup and view all the answers

    What is a characteristic of a part and grooving tool?

    <p>It cuts on its ends</p> Signup and view all the answers

    Is a circle in an isometric projection an ellipse?

    <p>True</p> Signup and view all the answers

    What is true about NC machines?

    <p>They had no memory</p> Signup and view all the answers

    What do the arrows on the ends of section lines indicate in machinist blueprints?

    <p>The direction to view the section</p> Signup and view all the answers

    What is the chisel edge of a drill bit?

    <p>It is provided by grinding the heel lower than the cutting edge</p> Signup and view all the answers

    What does the term CNC refer to?

    <p>Computer Numeric Control</p> Signup and view all the answers

    What is the purpose of self-holding tapers?

    <p>To securely hold the drill bit in place</p> Signup and view all the answers

    What type of fit is referred to as a RC4?

    <p>Work that must run freely but at slow speeds and light journal presses.</p> Signup and view all the answers

    What does the symbol A refer to?

    <p>A basic surface finish.</p> Signup and view all the answers

    Which of the following is NOT a type of fit?

    <p>Basic surface finish.</p> Signup and view all the answers

    What is the correct sequence of views in an orthographic drawing?

    <p>Top, front, and right side.</p> Signup and view all the answers

    What is the primary purpose of a RC4 fit?

    <p>To enable work to run freely but at slow speeds and light journal presses.</p> Signup and view all the answers

    Which of the following views is NOT a common view in an orthographic drawing?

    <p>Back view.</p> Signup and view all the answers

    What is the primary purpose of an orthographic drawing?

    <p>To provide a detailed view of the top, front, and right side of a part.</p> Signup and view all the answers

    What is the term for the accurate location of parts without perceptible play?

    <p>Accurate location of parts without perceptible play.</p> Signup and view all the answers

    What is the function of an oil mist lubrication system?

    <p>To not be affected by oil viscosity.</p> Signup and view all the answers

    What is the cutting speed for a 4-inch diameter workpiece when the RPM is 900?

    <p>966.86 RPM</p> Signup and view all the answers

    What is the cutting speed for a 3-inch diameter workpiece when the RPM is 550?

    <p>417.65 RPM</p> Signup and view all the answers

    What type of viscosity does a liquid that pours slowly have?

    <p>High</p> Signup and view all the answers

    What is a true statement about American Standards for Coded Information Interchange?

    <p>The coding system uses an odd parity format.</p> Signup and view all the answers

    What is the function of a spider?

    <p>Is used when long tubular work pieces require a centre.</p> Signup and view all the answers

    Where is the headstock attached on a lathe?

    <p>Left side of the bed.</p> Signup and view all the answers

    What is the machining of curved surfaces known as?

    <p>Profiling.</p> Signup and view all the answers

    What is the term 'grit' referring to in grinding wheels?

    <p>The abrasiveness.</p> Signup and view all the answers

    What does odd parity mean in reference to CNC terminology?

    <p>Each program character is represented in rows containing odd number holes.</p> Signup and view all the answers

    What is the direction toward the spindle centerline when working with a CNC machine?

    <p>Z</p> Signup and view all the answers

    What is a triangle with an angle greater than 90° called?

    <p>An oblique triangle.</p> Signup and view all the answers

    What is the taper per foot of a taper with D=14, d=2, and TL=10?

    <p>14.4</p> Signup and view all the answers

    What is the circumference of a circular hole with a diameter of 35.6 mm?

    <p>223.7 mm</p> Signup and view all the answers

    What is the large diameter of a taper with d=2, TL=10, and TPF=10.08?

    <p>11.14</p> Signup and view all the answers

    How is an angle denoted with polar coordinates when measured counter-clockwise?

    <p>Positive.</p> Signup and view all the answers

    What is the diameter of the workpiece that can be supported over the ways?

    <p>The largest diameter of workpiece</p> Signup and view all the answers

    What does the letter 'T' stand for in CNC programming?

    <p>Tool index</p> Signup and view all the answers

    What is the advantage of using a taper attachment over a compound rest for cutting tapers?

    <p>Easy transformation of the lathe from taper turning to parallel turning</p> Signup and view all the answers

    Where does the compound rest on a lathe?

    <p>It rests to the left of the cross-slide</p> Signup and view all the answers

    What is a characteristic of a part and grooving tool?

    <p>It is used to cut a flat surface at right angles to the axis of the workpiece</p> Signup and view all the answers

    What is true about NC machines?

    <p>They had no memory</p> Signup and view all the answers

    What does the term CNC refer to?

    <p>Computer Numeric Control</p> Signup and view all the answers

    What does the number 12 represent in the surface speed formula for calculations involving CNC turning machines?

    <p>A conversion factor to metric</p> Signup and view all the answers

    What determines the cutting performance of a saw blade?

    <p>All of the above</p> Signup and view all the answers

    Which type of wheel would be used on a grinder when you are doing light finishing and chamfering?

    <p>A flap wheel</p> Signup and view all the answers

    Which of the following cutting fluids would be best to use when drilling into Brass?

    <p>A soluble oil</p> Signup and view all the answers

    Which type of shoulder is a simple cut but will weaken the shaft by creating a stress?

    <p>The square shoulder</p> Signup and view all the answers

    What type of lubrication system allows lubricant to escape into the environment after it has been applied to the machine?

    <p>A flow through system</p> Signup and view all the answers

    How can chattering be reduced when cutting a groove into a workpiece?

    <p>By doing all of the above</p> Signup and view all the answers

    What does the term 'parting-off' refer to in CNC turning centres and lathes?

    <p>Machining to separate a part from the main bar stock</p> Signup and view all the answers

    What is the recommended drill point angle for hard materials?

    <p>118</p> Signup and view all the answers

    What is the common taper found on drills over 1/2 inch?

    <p>Type D-1 and type L</p> Signup and view all the answers

    If 1 inch is equal to 25.4 mm, what is the value of 125 cm in inches?

    <p>49.21</p> Signup and view all the answers

    In the diagram, if x is equal to 62 units and y is equal to 45 units, what is the value of angle?

    <p>36°</p> Signup and view all the answers

    Which of the following represents the ANSI standard material section for plastic?

    <p>#4</p> Signup and view all the answers

    What is the angle most often used to draw isometric drawings?

    <p>45°</p> Signup and view all the answers

    Is a circle in an isometric projection an ellipse?

    <p>True</p> Signup and view all the answers

    What do the arrows on the ends of section lines indicate in machinist blueprints?

    <p>The direction to view the section</p> Signup and view all the answers

    What is the purpose of self-holding tapers?

    <p>To provide a secure fit</p> Signup and view all the answers

    What type of wheel would be used on a grinder when doing light finishing and chamfering?

    <p>A flap wheel</p> Signup and view all the answers

    Which cutting fluid would be best to use when drilling into Brass?

    <p>A soluble oil</p> Signup and view all the answers

    What type of shoulder is a simple cut but will weaken the shaft by creating a stress?

    <p>The undercut shoulder</p> Signup and view all the answers

    How can chattering be reduced when cutting a groove into a workpiece?

    <p>By doing all of the above</p> Signup and view all the answers

    What does the term 'parting-off' refer to in CNC turning centres and lathes?

    <p>Machining to separate a part from the main bar stock</p> Signup and view all the answers

    What is the recommended drill point angle for hard materials?

    <p>118</p> Signup and view all the answers

    Which drill machine would be best suited for drilling in very large workpieces that are difficult to position?

    <p>A radial drill machine</p> Signup and view all the answers

    What type of lubrication system allows lubricant to escape into the environment after it has been applied to the machine?

    <p>A flow-through system</p> Signup and view all the answers

    What is the maximum number of rows where program characters are found in EIA coding?

    <p>7</p> Signup and view all the answers

    What does the M code M05 cause to happen in a CNC program?

    <p>It will cause the machine to stop executing a program.</p> Signup and view all the answers

    What is used to align and secure the straight shank in Jacob's impact keyless chucks?

    <p>Steel collets</p> Signup and view all the answers

    What diameter must be used when doing spindle calculations for threading operations with a CNC machine?

    <p>The major diameter of the thread being cut</p> Signup and view all the answers

    Which linear axis controls the length in a CNC machine?

    <p>X axis</p> Signup and view all the answers

    What is the spindle speed control of a CNC machine?

    <p>A type of transitional spindle control</p> Signup and view all the answers

    What does the M code M00 cause to happen in a CNC program?

    <p>It will cause the machine to stop executing a program.</p> Signup and view all the answers

    What is the correct direction of the length controlling motion in a CNC machine?

    <p>X axis</p> Signup and view all the answers

    What is the part on a hand-held tap that provides a spot for chips to accumulate and a passage for cutting fluid?

    <p>The flute</p> Signup and view all the answers

    What is parallax error?

    <p>A visual error</p> Signup and view all the answers

    What is the tap drill size for a M10 x 1.25 thread?

    <p>8.75 mm</p> Signup and view all the answers

    What is the best blade to use when cutting cast iron with a hacksaw?

    <p>An all-hard blade</p> Signup and view all the answers

    What is a hacksaw's kerf?

    <p>The width of cut in the work material</p> Signup and view all the answers

    What does a 6 inch caliper mean?

    <p>It means that the caliper can measure up to 6 inches</p> Signup and view all the answers

    Which type of wheel would be used on a grinder when you want to clean a workpiece of scale and dirt but not remove any of the metal?

    <p>A wire wheel</p> Signup and view all the answers

    In the surface speed formula used with CNC turning machines, as the rpm increases what happens to the CS?

    <p>It increases</p> Signup and view all the answers

    Which type of set screw point would be turned into a drilled hole to maintain alignment between a collar and a shaft?

    <p>Half-dog</p> Signup and view all the answers

    What is the taper per foot of a 12 inch taper key?

    <p>1/12 inch</p> Signup and view all the answers

    What is a disadvantage of a drill chuck?

    <p>It has poor accuracy.</p> Signup and view all the answers

    What is the difference in area between a circular tolerance zone and a square tolerance zone?

    <p>57%</p> Signup and view all the answers

    What does the term 'nominal surface' mean in surface finishes?

    <p>The intended surface of the workpiece as specified in the drawing</p> Signup and view all the answers

    Which of the following best describes a revolving centre?

    <p>It rotates on a bearing to prevent friction and heat buildup.</p> Signup and view all the answers

    What type of CNC work are you performing when you are creating workpieces from raw material that is greater than three times its diameter?

    <p>Bar work</p> Signup and view all the answers

    What is the best description for a sliding fit?

    <p>Accurate location of parts where parts move and turn freely but are not intended to run freely</p> Signup and view all the answers

    In a CNC program, what does the G code G04 cause to happen?

    <p>It causes the machine to pause for a specified period.</p> Signup and view all the answers

    What is a FN2 fit used for?

    <p>For ordinary steel parts or light shrink fits on thin sections</p> Signup and view all the answers

    Which of the following represents the Front View of the figure?

    <p>Option B</p> Signup and view all the answers

    When using the front face as program zero, what are all X coordinate values?

    <p>They are all positive.</p> Signup and view all the answers

    Which of the following symbols represents 'material removal allowance'?

    <p>Symbol A</p> Signup and view all the answers

    Which of the following is a correct statement with respect to Quadrant 3 of an X and Z axis?

    <p>-X, -Z</p> Signup and view all the answers

    When programming a CNC what does the letter 'S' stand for?

    <p>It stands for spindle speed.</p> Signup and view all the answers

    Which type of lubrication system relies on a pump to force oil under pressure into a bearing?

    <p>Pressure lubrication system</p> Signup and view all the answers

    Study Notes

    CNC Machining and Turning

    • To support the workpiece, a compound rest can be used.
    • CNC lathes require a specific measurement during tapping operations, which is Frequency (D).

    Cutting and Drilling

    • Drilling provides a quick way of making an accurate hole with a good surface finish.
    • The recommended cutting speed (SFPM) for high-speed steel drills when the workpiece material is Aluminium is 150 (B).
    • Boring, threading, and reaming are other machining processes.

    Stopping the Carriage and Fasteners

    • A stop shaft has six adjustable screws in an indexable head (A).
    • Applying too much pressure to fasteners can cause the component to become deformed (B).

    CNC Programming

    • In a CNC program, G code G20 specifies that all information must be in the imperial measurement system (A).
    • The letter "T" in CNC programming stands for tool selection (C).

    Cutting Fluids and Grinders

    • A good quality cutting fluid should resist corrosion, becoming rancid, and be non-toxic (D).
    • A side wheel grinder has an advantage over a bench grinder in supporting larger workpieces (A).

    Lathe Operations

    • A taper attachment has an advantage over a compound rest for cutting tapers in ease of transformation from taper turning to parallel turning (A).
    • The compound rest is located on top of the cross-slide (C).
    • A parting and grooving tool is used to cut a flat surface at right angles to the axis of the workpiece (D).

    NC Machines and CNC

    • NC machines were soft-wired (A).
    • CNC refers to Computer Numeric Control (B).
    • The term "grit" in grinding wheels refers to the abrasiveness (D).

    Mathematics and Geometry

    • A triangle with an angle greater than 90° is called an oblique triangle (D).
    • The circumference of a circular hole with a diameter of 35.6 mm is approximately 111.8 mm (B).

    Tapers and Fits

    • A taper with D=14, d=2, TL=10 has a taper per foot of approximately 14.4 (A).
    • The large diameter of a taper with d=2, TL=10, TPF=10.08 is approximately 11.14 (A).
    • A fit referred to as RC4 is an accurate location of parts where parts move and turn freely but are not intended to run freely (C).
    • Material section lines on a blueprint for plastic are represented by #4 (D).
    • The angle most often used to draw isometric drawings is 30° (A).
    • A circle drawn in an isometric projection would form an ellipse (A).
    • The three common views of an orthographic drawing are top, front, and right side (D).

    Machining Operations

    • A servo motor controller develops appropriate signals from program data to drive servo motors.

    Lubrication Systems

    • The advantage of an oil mist lubrication system is that it ensures the oil is always clean.

    Cutting Speed

    • The cutting speed for a 4-inch diameter workpiece when the RPM is 900 is 945.71 RPM.
    • The cutting speed for a 3-inch diameter workpiece when the RPM is 550 is 425.21 RPM.

    Viscosity

    • A liquid that pours slowly has high viscosity.

    American Standards for Coded Information Interchange

    • American Standards for Coded Information Interchange uses an odd parity format.

    Lathe Components

    • A spider is used when long, tubular work pieces require a centre.
    • The headstock is always attached to the left side of the bed.

    Machining Techniques

    • Machining of curved surfaces is known as profiling.
    • Undercutting is not a machining technique for curved surfaces.

    Band Saw Blades

    • The set of the blade provides the clearance for the back of the blade.

    Cutting Fluids

    • A sulphur-based cutting oil is suitable for drilling into Brass.

    Shoulders

    • A filleted shoulder is a type of shoulder that is strong and does not weaken the shaft.

    Lubrication Systems

    • A flow-through system allows lubricant to escape into the environment after it has been applied to the machine.

    Chattering

    • Chattering can be reduced when cutting a groove into a workpiece by moving the carriage back and forth slightly, mounting the grooving tool with as little overhang as possible, and supporting the workpiece with the tailstock center.

    CNC Turning Centres and Lathes

    • "Parting-off" refers to machining that separates a part from the main bar stock.

    Drill Point Angle

    • The recommended drill point angle for hard materials is 118.

    Drill Machines

    • A radial drill machine is suitable for drilling in very large work pieces that are difficult to position.

    CNC Programming

    • The letter "T" in CNC programming stands for tool selection.

    Taper Attachments

    • The advantage of using a taper attachment over a compound rest for cutting tapers is that mating tapers are easily produced with only two taper set-ups.

    Lathe Components

    • The compound rest rests on top of the cross-slide.

    Part and Grooving Tools

    • A part and grooving tool is used to cut a flat surface at right angles to the axis of the workpiece.

    NC Machines

    • NC machines were not soft wired, easy to program, or had no memory.

    Chisel Edge

    • The chisel edge of a drill bit is provided by grinding the heel lower than the cutting edge.

    CNC Term

    • CNC stands for Computer Numeric Control.

    Surface Speed Formula

    • The number 12 in the surface speed formula represents a conversion factor to metric.

    Lubrication Systems

    • A ring oiler lubrication system is an enclosed circulating lubrication system.

    Grinding Wheels

    • The "grit" of a grinding wheel refers to its abrasiveness.

    Angle Denotation

    • An angle denoted with polar coordinates measured counter-clockwise is positive.

    CNC Terminology

    • Odd parity in CNC terminology means each program character is represented in rows containing an odd number of holes.

    Coordinate Systems

    • In CNC machines, the direction toward the spindle centerline is denoted by -Z.

    Triangles

    • A triangle with an angle greater than 90° is called an oblique triangle.

    Tapers

    • A taper with D=14, d=2, TL=10 has a taper per foot of 7.5.
    • The large diameter of a taper with d=2, TL=10, TPF=10.08 is 11.14.

    Circumference

    • The circumference of a circular hole with a diameter of 35.6 mm is 111.8 mm.

    Drills

    • A self-holding taper with an approximate taper of 5/8 inch per taper foot is known as type D-1 and type L.

    Unit Conversion

    • 125 cm is equal to 49.21 inches.

    Trigonometry

    • In a right-angled triangle, if one angle is 62 units and the other is 45 units, the value of the third angle is 58°.
    • In material section lines on a blueprint, the ANSI standard material section for plastic is represented by #4.

    Isometric Drawings

    • A circle drawn in an isometric projection forms an ellipse.
    • The angle most often used to draw isometric drawings is 30 degrees.

    Blueprints

    • Arrows on the ends of section lines on a blueprint indicate the direction to view the section.

    Machine Tools and CNC Programming

    • A tap's flute provides a passage for cutting fluid and a spot for chips to accumulate.
    • Parallax error is a visual error.
    • The tap drill size for a M10 1.25 thread is 8.75 mm.
    • When cutting cast iron with a hacksaw, the best blade to use is a raker blade.
    • A hacksaw's kerf is the width of cut in the work material.
    • A 6 inch caliper can measure up to 6 inches.

    CNC Programming and Machine Tools

    • A wire wheel is used on a grinder when cleaning a workpiece of scale and dirt but not removing metal.
    • In the surface speed formula, as the rpm increases, the CS (surface speed) increases.
    • Chattering can be reduced when parting off a workpiece by moving the carriage forward slightly.
    • In a CNC program, the M code M05 stops the spindle's rotation.
    • In a CNC program, the M code M00 causes the machine to stop executing a program.
    • Jacob's impact keyless chucks use steel collets to align and secure the straight shank.
    • When doing spindle calculations for threading operations with a CNC machine, the major diameter of the thread being cut is used.
    • The X axis is the length controlling motion direction on a CNC machine.
    • The spindle speed control of a CNC machine is a type of transitional spindle control.

    Cutting Tools and Materials

    • A flap wheel is used on a grinder when doing light finishing and chamfering.
    • When drilling into Brass, a soluble oil is the best cutting fluid to use.
    • A square shoulder is a simple cut but can weaken the shaft by creating a stress.
    • A flow-through system is a type of lubrication system that allows lubricant to escape into the environment.
    • Chattering can be reduced when cutting a groove into a workpiece by mounting the grooving tool with as little overhang as possible.
    • Parting-off refers to machining to separate a part from the main bar stock.
    • A recommended drill point angle for hard materials is 118.
    • A radial drill machine is best suited for drilling in very large workpieces that are difficult to position.

    CNC Machines and Operations

    • A drill chuck has poor accuracy as a disadvantage.
    • A revolving centre is used when the entire length of the workpiece must be machined in one pass.
    • In a CNC program, the G code G04 causes the machine to pause for a specified period.
    • When using the front face as program zero, all X coordinate values are positive.
    • In Quadrant 3 of an X and Z axis, all X coordinate values are negative and all Z coordinate values are negative.
    • The letter "S" in CNC programming stands for spindle speed.
    • A pump is used in a pressure lubrication system to force oil into a bearing.

    Tolerances and Fits

    • A 12 inch taper key has a 1/16 inch taper.
    • The difference in area between a circular tolerance zone and a square tolerance zone is 57%.
    • The term "nominal surface" refers to the intended surface of the workpiece as specified in the drawing.
    • A sliding fit is an accurate location of parts where parts move and turn freely but are not intended to run freely.
    • A FN2 fit is used for ordinary steel parts or light shrink fits on thin sections.

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