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Questions and Answers
Which of the following types of portable fire extinguishers is classified as the best type of extinguisher to use on a paper fire?
Which of the following types of portable fire extinguishers is classified as the best type of extinguisher to use on a paper fire?
- A) Class A (correct)
- B) Class B
- C) Class C
- D) Class D
Which of the following best describes a narrow rule?
Which of the following best describes a narrow rule?
- It is most commonly used by Machinists
- It has graduations only along one edge. (correct)
- It can be used to set an inside caliper
- It has measuring edges ground flat
With machine screws, which of the following has the largest major diameter?
With machine screws, which of the following has the largest major diameter?
- #0
- #1
- #2 (correct)
With file coarseness, when does the distance between the teeth becomes narrower?
With file coarseness, when does the distance between the teeth becomes narrower?
Using the Unified thread designation, a bolt has the following:
1/2-16 UNC- 2A
What does the "2" on the above designation represent?
Using the Unified thread designation, a bolt has the following:
1/2-16 UNC- 2A
What does the "2" on the above designation represent?
How many teeth per inch should a hacksaw have if it is used to cut tool steel?
How many teeth per inch should a hacksaw have if it is used to cut tool steel?
Which of the following best describes a three square file?
Which of the following best describes a three square file?
What kind of sling does this best represent?
What kind of sling does this best represent?
The three types of harmful rays encountered during oxyacetylene use are visible light rays, infrared rays and what other rays?
The three types of harmful rays encountered during oxyacetylene use are visible light rays, infrared rays and what other rays?
About what percentage of the backing material is covered by abrasive on an open coated abrasive?
About what percentage of the backing material is covered by abrasive on an open coated abrasive?
To safeguard the wire rope from breaking during use, what would most likely be the safety factor used for public elevator cables?
To safeguard the wire rope from breaking during use, what would most likely be the safety factor used for public elevator cables?
Which of the following terms describes discrimination?
Which of the following terms describes discrimination?
Which part on a hand-held tap provide a spot for chips to accumulate and a passage for cutting fluid?
Which part on a hand-held tap provide a spot for chips to accumulate and a passage for cutting fluid?
What is parallax error?
What is parallax error?
What is the tap drill size for a M10 1.25 thread?
What is the tap drill size for a M10 1.25 thread?
What is the best blade to use when cutting cast iron with a hacksaw
What is the best blade to use when cutting cast iron with a hacksaw
What is a hacksaw's kerf?
What is a hacksaw's kerf?
What does a 6 inch caliper mean?
What does a 6 inch caliper mean?
Which type of wheel would be used on a grinder when you want to clean a work piece of scale and dirt but not remove any of the metal?
Which type of wheel would be used on a grinder when you want to clean a work piece of scale and dirt but not remove any of the metal?
In the surface speed formula used with CNC turning machines, as the rpm increases what happens to the CS?
In the surface speed formula used with CNC turning machines, as the rpm increases what happens to the CS?
How can chattering be reduced when parting off a workpiece?
How can chattering be reduced when parting off a workpiece?
Which of the following provides a quick way of making an accurate hole with a good surface finish?
Which of the following provides a quick way of making an accurate hole with a good surface finish?
What measurement must be used for a CNC lathe when doing a tapping operation?
What measurement must be used for a CNC lathe when doing a tapping operation?
Which of the following describes a stop shaft?
Which of the following describes a stop shaft?
What is one of the hazards of applying too much pressure to the fasteners of components when machining?
What is one of the hazards of applying too much pressure to the fasteners of components when machining?
What is the recommended cutting speed SFPM for high speed steel drills when the workpiece material is Aluminium?
What is the recommended cutting speed SFPM for high speed steel drills when the workpiece material is Aluminium?
In a CNC program, what does the G code G20 specify?
In a CNC program, what does the G code G20 specify?
Which of the following is an important characteristic of a good quality cutting fluid?
Which of the following is an important characteristic of a good quality cutting fluid?
What is the advantage of a side wheel grinder over a bench grinder?
What is the advantage of a side wheel grinder over a bench grinder?
Which of the following best describes a sensitive drill press?
Which of the following best describes a sensitive drill press?
What is the primary axis on a lathe?
What is the primary axis on a lathe?
Which of the following is a way to counter the effect of backlash?
Which of the following is a way to counter the effect of backlash?
Where are back rake angles ground?
Where are back rake angles ground?
Which of the following types of abrasive grit is commonly used when grinding steel?
Which of the following types of abrasive grit is commonly used when grinding steel?
With respect to CNC turning centres which of the following is true with respect to single spindle-single turret arrangements?
With respect to CNC turning centres which of the following is true with respect to single spindle-single turret arrangements?
What does a band file consist of?
What does a band file consist of?
What is an axis?
What is an axis?
With EIA coding, what is the maximum number of rows where program characters are found?
With EIA coding, what is the maximum number of rows where program characters are found?
In a CNC program, what does the M code M05 cause to happen?
In a CNC program, what does the M code M05 cause to happen?
In a CNC program, what does the M code M00 cause to happen?
In a CNC program, what does the M code M00 cause to happen?
What do Jacob's impact keyless chucks use to align and secure the straight shank?
What do Jacob's impact keyless chucks use to align and secure the straight shank?
What diameter must be used when doing spindle calculations for threading operations with a CNC machine?
What diameter must be used when doing spindle calculations for threading operations with a CNC machine?
When using a CNC machine there are two linear axes X and Y. Which one is the length controlling motion direction?
When using a CNC machine there are two linear axes X and Y. Which one is the length controlling motion direction?
Which of the following best describes the spindle speed control of a CNC machine?
Which of the following best describes the spindle speed control of a CNC machine?
What is the advantage of using an oil mist lubrication system?
What is the advantage of using an oil mist lubrication system?
What is the cutting speed for a 4-inch diameter workpiece when the RPM is 900?
What is the cutting speed for a 4-inch diameter workpiece when the RPM is 900?
What is the cutting speed for a 3-inch diameter workpiece when the RPM is 550?
What is the cutting speed for a 3-inch diameter workpiece when the RPM is 550?
What kind of viscosity does a liquid that pours slowly have?
What kind of viscosity does a liquid that pours slowly have?
Which of the following is a true with respect to American Standards for Coded Information Interchange?
Which of the following is a true with respect to American Standards for Coded Information Interchange?
Which of the following describes a spider?
Which of the following describes a spider?
With a lathe, where is the headstock is always attached to?
With a lathe, where is the headstock is always attached to?
What is machining of curved surfaces known as?
What is machining of curved surfaces known as?
When referring to a band saw blade, what provides the clearance for the back of the blade?
When referring to a band saw blade, what provides the clearance for the back of the blade?
Which type of wheel would be used on a grinder when you are doing light finishing and chamfering?
Which type of wheel would be used on a grinder when you are doing light finishing and chamfering?
Which of the following cutting fluids would be best to use when drilling into Brass?
Which of the following cutting fluids would be best to use when drilling into Brass?
Which of the following types of shoulders is a simple cut but will weaken the shaft by creating a stress?
Which of the following types of shoulders is a simple cut but will weaken the shaft by creating a stress?
What type of lubrication system allows lubricant to escape into the environment after it has been applied to the machine?
What type of lubrication system allows lubricant to escape into the environment after it has been applied to the machine?
How can chattering be reduced when cutting a groove into a workpiece?
How can chattering be reduced when cutting a groove into a workpiece?
With CNC turning centres and lathes, what does the term "parting-off" refer to?
With CNC turning centres and lathes, what does the term "parting-off" refer to?
What is the recommended drill point angle for hard materials?
What is the recommended drill point angle for hard materials?
Which of the following would be best suited for drilling in very large work pieces that are difficult to position?
Which of the following would be best suited for drilling in very large work pieces that are difficult to position?
Where is the feed reverse lever found on a lathe?
Where is the feed reverse lever found on a lathe?
What is the drill point angle for general purpose use?
What is the drill point angle for general purpose use?
When is running a dial indicator along a workpiece a good way to align the workpiece?
When is running a dial indicator along a workpiece a good way to align the workpiece?
Which of the following lathe stops is clamped to the ways of the lathe?
Which of the following lathe stops is clamped to the ways of the lathe?
What is a characteristic of a Chucking Centre machine?
What is a characteristic of a Chucking Centre machine?
The tool rest on a bench grinder should be adjusted so that there is no more than how much of an inch between the grinding wheel and
the rest?
The tool rest on a bench grinder should be adjusted so that there is no more than how much of an inch between the grinding wheel and the rest?
What determines the amount of material that can be removed within a given time with a lathe?
What determines the amount of material that can be removed within a given time with a lathe?
When programming a CNC what does the letter "T" stand for?
When programming a CNC what does the letter "T" stand for?
What is the advantage of using a taper attachment over a compound rest for cutting tapers?
What is the advantage of using a taper attachment over a compound rest for cutting tapers?
On a lathe, where does the compound rest?
On a lathe, where does the compound rest?
Which of the following best describes a part and grooving tool?
Which of the following best describes a part and grooving tool?
Which of the following is true with respect to NC machines?
Which of the following is true with respect to NC machines?
Which of the following statements best describes the chisel edge of a drill bit?
Which of the following statements best describes the chisel edge of a drill bit?
What does the term CNC refer to?
What does the term CNC refer to?
What does the number 12 represent in the surface speed formula for calculations involving CNC turning machines?
What does the number 12 represent in the surface speed formula for calculations involving CNC turning machines?
Which of the following is a disadvantage of a drill chuck
Which of the following is a disadvantage of a drill chuck
Which of the following best describes a revolving centre?
Which of the following best describes a revolving centre?
What type of CNC work are you performing when you are creating workpieces from raw material that is greater than three times its
diameter?
What type of CNC work are you performing when you are creating workpieces from raw material that is greater than three times its diameter?
In a CNC program, what does the G code G04 cause to happen?
In a CNC program, what does the G code G04 cause to happen?
When using the front face as program zero, what are all X coordinate values?
When using the front face as program zero, what are all X coordinate values?
Which of the following is a correct statement with respect to Quadrant 3 of an X and Z axis?
Which of the following is a correct statement with respect to Quadrant 3 of an X and Z axis?
When programming a CNC what does the letter "S" stand for?
When programming a CNC what does the letter "S" stand for?
Which type of lubrication system relies on a pump to force oil under pressure into a bearing?
Which type of lubrication system relies on a pump to force oil under pressure into a bearing?
What does the term "grit" refer to when looking at grinding wheels?
What does the term "grit" refer to when looking at grinding wheels?
How is an angle denoted with polar coordinates when measured counter clockwise?
How is an angle denoted with polar coordinates when measured counter clockwise?
What does odd parity mean in reference to CNC terminology?
What does odd parity mean in reference to CNC terminology?
When working with a CNC machine, what commonality would you use to describe the direction toward the spindle centerline?
When working with a CNC machine, what commonality would you use to describe the direction toward the spindle centerline?
What is a triangle that contains an angle grater than 90° called?
What is a triangle that contains an angle grater than 90° called?
What is the taper per foot of a taper with D=14, d=2, TL=10?
What is the taper per foot of a taper with D=14, d=2, TL=10?
What is the large diameter of a taper with d=2, TL=10, TPF=10.08?
What is the large diameter of a taper with d=2, TL=10, TPF=10.08?
The diameter of a circular hole that the machinist has to cut is 35.6 mm. What is the circumference of this hole?
The diameter of a circular hole that the machinist has to cut is 35.6 mm. What is the circumference of this hole?
Purchasing an $8700 pump you pay $609 in sales tax. What percent sales tax are you paying?
Purchasing an $8700 pump you pay $609 in sales tax. What percent sales tax are you paying?
What is the TPF for a Jarno taper system?
What is the TPF for a Jarno taper system?
If 1kg = 2.2 lbs, a millwright that weighs 225 lbs would weigh how many kg?
If 1kg = 2.2 lbs, a millwright that weighs 225 lbs would weigh how many kg?
A journeyperson machinist makes $32.45 per hour. If he/she is given a 4.5% raise, how much per hour would the machinist be making?
A journeyperson machinist makes $32.45 per hour. If he/she is given a 4.5% raise, how much per hour would the machinist be making?
Which of the following best describes a steep machine taper?
Which of the following best describes a steep machine taper?
What is the angle most often used to draw isometric drawings?
What is the angle most often used to draw isometric drawings?
A circle drawn in an isometric projection would form an ellipse.
A circle drawn in an isometric projection would form an ellipse.
When referring to machinist blueprints, what do the arrows on the ends of the section lines indicate?
When referring to machinist blueprints, what do the arrows on the ends of the section lines indicate?
What style of set screw point would be turned into a drilled hole to maintain alignment between a collar and a shaft?
What style of set screw point would be turned into a drilled hole to maintain alignment between a collar and a shaft?
How much of a taper does a 12 inch taper key have?
How much of a taper does a 12 inch taper key have?
What is the difference in area between a circular tolerance zone and a square tolerance zone?
What is the difference in area between a circular tolerance zone and a square tolerance zone?
When referring to surface finishes, what does the term "nominal surface" mean?
When referring to surface finishes, what does the term "nominal surface" mean?
What is the best description for a sliding fit?
What is the best description for a sliding fit?
What is a FN2 fit used for?
What is a FN2 fit used for?
Which of the following type of fit is referred to as a RC4?
Which of the following type of fit is referred to as a RC4?
The three common views of an orthographic drawing are:
The three common views of an orthographic drawing are:
Study Notes
Portable Fire Extinguishers
- Class A extinguisher is best for paper fires.
Thread Designation
- In Unified thread designation, "2" represents the class of fit.
File Coarseness
- As file coarseness increases, the distance between teeth becomes narrower.
Machine Screws
- Major diameter of machine screws is largest.
Hacksaw
- Hacksaw for cutting tool steel should have 14-18 teeth per inch.
- Best blade for cutting cast iron is a hacksaw with 14-18 teeth per inch.
- Kerf of a hacksaw is the width of the cut.
Caliper
- A 6-inch caliper means the maximum distance it can measure is 6 inches.
Grinder
- Open-coated abrasive is used for cleaning workpieces of scale and dirt.
- Wheel used for cleaning workpieces is a wire brush wheel.
Surface Speed Formula
- As rpm increases, CS (cutter speed) also increases.
CNC Lathe
- Tap drill size for M10 1.25 thread is calculated using the tap drill size formula.
- Measurement used for CNC lathe tapping operation is pitch diameter.
- Safety factor used for public elevator cables is usually 10.
CNC Program
- G code G20 specifies inches as the unit of measurement.
- M code M05 causes the spindle to stop.
- M code M00 causes the program to stop.
Cutting Fluid
- Important characteristic of a good quality cutting fluid is its ability to cool and lubricate.
Drill Press
- Sensitive drill press is a drill press that can drill accurate, precise holes.
Lathe
- Primary axis on a lathe is the z-axis.
- Backlash is countered by using a split nut or a backlash eliminator.
- Back rake angles are ground on the tool bit.
CNC Turning Centres
- Single spindle-single turret arrangement is a common setup for CNC turning centres.
- Band file consists of a series of flat, rectangular files.
- Axis is a line of motion or direction.
EIA Coding
- Maximum number of rows where program characters are found is 16.
Oil Mist Lubrication
- Advantage of using an oil mist lubrication system is its ability to reduce lubricant consumption.
Spindle Speed Control
- Spindle speed control on a CNC machine is usually controlled by a variable frequency drive.
Machine Stops
- Feed reverse lever is found on the lathe.
- Lathe stops are used to position the workpiece accurately.
- Revolving centre is used to support long, slender workpieces.
CNC Terminology
- CNC refers to Computer Numerical Control.
- "Parting-off" refers to the process of cutting a workpiece from a larger piece of stock.
Drill Point Angle
- Recommended drill point angle for hard materials is 130-135 degrees.
- Recommended drill point angle for general purpose use is 118-120 degrees.
Lubrication System
- Hydraulic lubrication system relies on a pump to force oil under pressure into a bearing.
- Open lubrication system allows lubricant to escape into the environment after it has been applied.
CNC Machines
- Quadrant 3 of an X and Z axis is the negative X and positive Z axis region.
- When programming a CNC, "T" stands for tool and "S" stands for spindle speed.
- NC machines are Numerical Control machines.
Grinding Wheels
- "Grit" refers to the size of the abrasive particles in a grinding wheel.
Trigonometry
- Angle denoted with polar coordinates when measured counter-clockwise is denoted by a positive sign.
- Triangle with an angle greater than 90 degrees is called an obtuse triangle.
Math
- TPF (taper per foot) of a taper is calculated using the formula TPF = (D-d)/TL.
- Circumference of a circle is calculated using the formula C = πd.
- Sales tax is calculated as a percentage of the purchase price.
- If 1kg = 2.2 lbs, a millwright weighs 225 lbs = 102.27 kg.
- A journeyperson machinist makes $32.45 per hour and receives a 4.5% raise.
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Description
Part 1
