What kind of angle do you generally want when grinding a tool for lathe turning?
- 30-45 degrees
- 10-15 degrees
- 8-10 degrees
- 5-7 degrees
Correct Answer: 8-10 degrees
Correct Answer Explanation: The ideal clearance angle for lathe turning tools is 8-10 degrees to prevent the flank of the tool from rubbing against the workpiece and causing friction and heat, which can reduce cutting efficiency and tool life.
What is the common name for the gears in a lathe’s headstock that reduce spindle speed for slower turning operations?
- Drive gears
- Tailstock gears
- Back-gears
- Change gears
Correct Answer: Back-gears
Correct Answer Explanation: Back-gears are a set of gears located in the headstock of a lathe, used to reduce the spindle speed for slower turning operations. They are engaged by a lever or knob to provide different speed ratios, allowing for turning various materials and diameters.
Which one of these lubricating materials is most commonly used to help with turning steel and wrought iron?
- Water
- Lard oil
- Kerosene
- Soda water
Correct Answer: Lard oil
Correct Answer Explanation: Lard oil is commonly used as a lubricant for turning steel and wrought iron. It acts as a cutting fluid, reducing friction between the tool and workpiece, improving surface finish, and prolonging tool life.
What type of turning tool is used to face the ends of a shaft square to its axis?
- Facing tool
- Side-tool
- Roughing tool
- Form tool
Correct Answer: Side-tool
Correct Answer Explanation: A side-tool is a specialized tool used to face the ends of shafts square to their axis. It has a cutting edge that is perpendicular to the axis of the tool, allowing for efficient and accurate facing operations.
What tool does the book describe being used in combination with a micrometer to measure the pitch diameter of a thread?
- A dial indicator
- A thread gage
- Three wires
- A caliper
Correct Answer: Three wires
Correct Answer Explanation: The three-wire system uses three wires placed in the thread grooves and measured with a micrometer to determine the pitch diameter. This method provides a precise measurement of the thread diameter, ensuring proper fit and engagement.
What is the best type of lathe for producing large quantities of duplicate parts?
- Engine lathe
- Turret lathe
- Vertical lathe
- Horizontal lathe
Correct Answer: Turret lathe
Correct Answer Explanation: Turret lathes are designed for high-volume production of identical parts. They feature a revolving turret that holds multiple cutting tools, allowing for efficient and quick operations.
Which method of turning tapers involves adjusting the tailstock center from the headstock center?
- Taper attachment method
- Offset center method
- Compound rest method
- Caliper method
Correct Answer: Offset center method
Correct Answer Explanation: The offset center method involves adjusting the tailstock center away from the headstock center to create a taper on the workpiece. The amount of offset determines the taper angle.
What is the term used for a turning tool with a specific shape for creating a particular profile or shape?
- Boring tool
- Form tool
- Threading tool
- Turning tool
Correct Answer: Form tool
Correct Answer Explanation: A form tool is a tool with a precisely shaped cutting edge designed to turn a specific profile or shape on the workpiece. It is commonly used for producing complex contours, grooves, and other special shapes.
How many spindles are featured on the New Britain Automatic Chucking Machine, as described in the book?
- 3
- 5
- 8
- 10
Correct Answer: 5 (single-head), 8 (double-head)
Correct Answer Explanation: The New Britain Automatic Chucking Machine is described in the book as having 5 spindles in a single-head configuration or 8 spindles in a double-head configuration. These machines were designed for high-speed and automated turning operations.
Which type of lathe is most suited for turning long, flexible workpieces?
- Engine lathe
- Turret lathe
- Vertical lathe
- Horizontal lathe
Correct Answer: Engine lathe
Correct Answer Explanation: Engine lathes are generally the best choice for turning long, flexible workpieces. Their longer bed and robust construction provide better support and stability for long parts.
What type of turning tool would be used to create a spherical surface on a workpiece?
- Roughing tool
- Boring tool
- Form tool
- Threading tool
Correct Answer: Form tool
Correct Answer Explanation: Form tools with a spherical profile are often used to create spherical surfaces on workpieces. These tools can generate a variety of spherical shapes and radii, depending on their design.
What is the term for a threaded connection where the thread winds in the opposite direction to a right-hand thread?
- Right-hand thread
- Left-hand thread
- Reverse thread
- Multiple thread
Correct Answer: Left-hand thread
Correct Answer Explanation: Left-hand threads are threaded in the opposite direction to right-hand threads. They are commonly used for applications where a reverse turning motion is desired, such as on screw jacks and some machine tools.
Which of these is a good lubrication option for turning brass?
- Water
- Lard oil
- Kerosene
- Cutting oil
Correct Answer: Cutting oil
Correct Answer Explanation: Cutting oils are specially formulated lubricants designed for metalworking operations, including turning brass. They provide excellent lubrication, reduce friction, and improve surface finish.
How is the “taper per foot” of a turned workpiece measured?
- Inches per inch
- Degrees per inch
- Inches per foot
- Degrees per foot
Correct Answer: Inches per foot
Correct Answer Explanation: Taper is often expressed in inches per foot, representing the difference in diameter over a length of 12 inches. For example, a taper of 0.5 inches per foot indicates a diameter change of 0.5 inches for every 12 inches of length.
Which type of fit involves heating the outer member and then cooling it after inserting the inner member?
- Forced fit
- Shrinkage fit
- Interference fit
- Loose fit
Correct Answer: Shrinkage fit
Correct Answer Explanation: A shrinkage fit is achieved by heating the outer member to expand it, then inserting the inner member. As the outer member cools, it contracts, creating a tight fit with the inner member. This method is often used for permanent assemblies.
What is the name of the machine tool that is used to remove metal from the inside of a hole?
- Lathe
- Milling machine
- Drilling machine
- Boring machine
Correct Answer: Boring machine
Correct Answer Explanation: Boring machines are specifically designed for machining holes, enlarging existing holes, or creating precise internal geometries. They typically use a boring bar with a cutting tool mounted on its end.
What is the typical cutting speed for annealed tool steel, in feet per minute?
- 10-20
- 25-35
- 40-50
- 60-70
Correct Answer: 25-35
Correct Answer Explanation: Annealed tool steel is a softer form of tool steel, allowing for a higher cutting speed than hardened tool steel. The typical cutting speed for annealed tool steel ranges from 25 to 35 feet per minute.
What is the typical cutting speed for soft yellow brass, in feet per minute?
- 20-40
- 50-70
- 100-150
- 150-200
Correct Answer: 150-200
Correct Answer Explanation: Soft yellow brass is a relatively soft metal, allowing for higher cutting speeds. The typical cutting speed for soft yellow brass ranges from 150 to 200 feet per minute.
Which of these would be a common use for a turret lathe?
- Turning large-diameter shafts
- Making small, intricate parts
- Machining complex engine components
- High-volume production of duplicate parts
Correct Answer: High-volume production of duplicate parts
Correct Answer Explanation: Turret lathes are best known for their ability to efficiently produce high volumes of identical parts. Their revolving turret holding multiple tools allows for quick and repetitive turning operations.
What is the term for the difference in diameter between the top and bottom of a taper?
- Taper allowance
- Taper angle
- Taper offset
- Taper length
Correct Answer: Taper allowance
Correct Answer Explanation: The taper allowance refers to the difference in diameter between the top and bottom of a taper. It indicates the amount of taper over a specific length.
What is the name of the device on a lathe that allows for turning tapers without adjusting the tailstock center?
- Compound rest
- Taper attachment
- Follow rest
- Steady rest
Correct Answer: Taper attachment
Correct Answer Explanation: A taper attachment is a specialized device that is fitted to a lathe and allows for accurate taper turning without offsetting the tailstock center.
What is the typical range of forced fit allowance per inch?
- 0.0001-0.0005 inches
- 0.001-0.0025 inches
- 0.005-0.01 inches
- 0.01-0.02 inches
Correct Answer: 0.001-0.0025 inches
Correct Answer Explanation: The typical range for forced fit allowance per inch is 0.001 to 0.0025 inches. This ensures a tight fit between the mating parts while still allowing for assembly.
What is the name of the turning tool that is used to cut internal threads?
- Boring tool
- Threading tool
- Form tool
- Tap
Correct Answer: Tap
Correct Answer Explanation: Taps are specialized tools used for cutting internal threads. They have a series of cutting edges that progressively engage the workpiece material, creating the desired thread profile.
What is the typical number of tools that can be held in a double-spindle flat turret lathe?
- 4
- 6
- 8
- 10
Correct Answer: 8
Correct Answer Explanation: A double-spindle flat turret lathe typically holds eight tools in its revolving turret. This allows for simultaneous machining operations on different parts of the workpiece.
Which of these materials is commonly used to create a “shrinkage fit” between two parts?
- Brass
- Bronze
- Steel
- Aluminum
Correct Answer: Steel
Correct Answer Explanation: Shrinkage fits are often used for assembling steel parts. The outer member is heated to expand it, then the inner member is inserted. As the outer member cools, it contracts, creating a tight and permanent fit.
What is the name of the screw that moves the carriage along the lathe bed, used for thread cutting?
- Spindle screw
- Lead screw
- Back gear screw
- Change gear screw
Correct Answer: Lead screw
Correct Answer Explanation: The lead screw is a critical component of a lathe, responsible for moving the carriage along the bed. It is threaded to match the thread pitch of the workpiece being cut.
What is the term for a thread with a steep lead, often used in gear drives?
- V-thread
- Square thread
- Worm thread
- U.S. Standard thread
Correct Answer: Worm thread
Correct Answer Explanation: Worm threads have a steep lead angle, creating a high mechanical advantage for gear drives. They are commonly used in worm gears, which are often used in low-speed applications.
What is the name of the support that is attached to the lathe carriage, used to support flexible workpieces during turning operations?
- Steady rest
- Follow rest
- Compound rest
- Tailstock center
Correct Answer: Follow rest
Correct Answer Explanation: A follow rest is a support device that is attached to the lathe carriage and follows the workpiece as it rotates. It is used to prevent the workpiece from flexing or vibrating during turning operations.
Which type of turning tool is used to create rough cuts on a workpiece, removing large amounts of material quickly?
- Finishing tool
- Form tool
- Roughing tool
- Threading tool
Correct Answer: Roughing tool
Correct Answer Explanation: Roughing tools have a larger cutting edge radius and are designed to remove material quickly, leaving a slightly rough surface. They are often used in the initial stages of turning to bring the workpiece to its approximate final dimensions.
What is the term used to describe a turning operation where one cylindrical surface is turned eccentric to another?
- Taper turning
- Offset turning
- Eccentric turning
- Contour turning
Correct Answer: Eccentric turning
Correct Answer Explanation: Eccentric turning involves creating one cylindrical surface offset from another. This technique is often used to create features such as cams, eccentric shafts, and other non-symmetrical components.
What is the name of the support that is attached to the lathe bed, used to support long, flexible workpieces during turning operations?
- Follow rest
- Steady rest
- Compound rest
- Tailstock center
Correct Answer: Steady rest
Correct Answer Explanation: A steady rest is a support device that is attached to the lathe bed and provides stability for long, flexible workpieces during turning operations. It helps prevent the workpiece from deflecting or vibrating under cutting forces.
What is the typical cutting speed for ordinary machine steel, in feet per minute?
- 20-30
- 45-65
- 70-90
- 100-120
Correct Answer: 45-65
Correct Answer Explanation: The typical cutting speed for ordinary machine steel ranges from 45 to 65 feet per minute. This speed allows for efficient metal removal while maintaining tool life and surface finish.
What is the typical cutting speed for ordinary cast iron, in feet per minute?
- 25-35
- 40-50
- 55-65
- 70-80
Correct Answer: 40-50
Correct Answer Explanation: Ordinary cast iron is typically turned at a speed of 40 to 50 feet per minute. This speed provides a good balance between metal removal rate and tool life.
Which of these types of lathes is designed for high-volume production of duplicate parts?
- Engine lathe
- Turret lathe
- Vertical lathe
- Horizontal lathe
Correct Answer: Turret lathe
Correct Answer Explanation: Turret lathes are specialized lathes optimized for producing large quantities of identical parts. They feature a revolving turret that holds multiple tools, enabling for quick and efficient repetition of turning operations.
What is the typical range of taper allowance per foot?
- 0.1-0.5 inches per foot
- 0.5-2.0 inches per foot
- 2.0-5.0 inches per foot
- 5.0-10.0 inches per foot
Correct Answer: 0.5-2.0 inches per foot
Correct Answer Explanation: The typical range of taper allowance per foot is 0.5 to 2.0 inches per foot. This range covers a wide variety of taper angles and is commonly used for different applications.
What is the name of the tool used for setting and testing the angle of thread tools?
- Thread gage
- Thread indicator
- Caliper
- Micrometer
Correct Answer: Thread gage
Correct Answer Explanation: A thread gage is a specialized tool designed to set and test the angle of thread tools. It consists of a series of blades with different thread angles, allowing for precise verification of thread tool geometry.
What is the typical cutting speed for hard bronze, in feet per minute?
- 10-20
- 35-80
- 90-120
- 150-200
Correct Answer: 35-80
Correct Answer Explanation: Hard bronze is a relatively hard material, requiring a slower cutting speed than softer materials. The typical cutting speed for hard bronze ranges from 35 to 80 feet per minute.
What is the name of the turning tool used to enlarge an existing hole or create a precise internal geometry?
- Boring tool
- Threading tool
- Form tool
- Roughing tool
Correct Answer: Boring tool
Correct Answer Explanation: A boring tool is specifically designed for machining holes. It is typically mounted on a boring bar and used to enlarge existing holes or create precise internal geometries.
What is the name of the turning operation that involves removing material from the end of a workpiece to create a flat surface perpendicular to the axis of rotation?
- Facing
- Turning
- Boring
- Threading
Correct Answer: Facing
Correct Answer Explanation: Facing is a turning operation that involves removing material from the end of a workpiece to create a flat surface perpendicular to the axis of rotation. This is often done to create a smooth and accurate end surface.
What is the name of the turning tool that is used to create threads on the outside of a workpiece?
- Boring tool
- Threading tool
- Form tool
- Roughing tool
Correct Answer: Threading tool
Correct Answer Explanation: A threading tool is specifically designed for cutting external threads on workpieces. It has a shaped cutting edge that forms the desired thread profile.
What is the term for the diameter of a thread measured at the bottom of the grooves?
- Pitch diameter
- Major diameter
- Root diameter
- Crest diameter
Correct Answer: Root diameter
Correct Answer Explanation: The root diameter of a thread is the diameter measured at the bottom of the grooves. It is an important dimension for determining the strength and fit of a threaded connection.
What is the name of the turning tool that is used to create a chamfer or a rounded edge on a workpiece?
- Form tool
- Chamfer tool
- Rounding tool
- Finishing tool
Correct Answer: Chamfer tool
Correct Answer Explanation: A chamfer tool is a turning tool with a specially shaped cutting edge that creates a chamfer, or a beveled edge, on a workpiece. Chamfers are often used to break sharp edges and improve the aesthetics of a part.
Which of these types of lathes is equipped with a revolving turret that holds multiple tools?
- Engine lathe
- Turret lathe
- Vertical lathe
- Horizontal lathe
Correct Answer: Turret lathe
Correct Answer Explanation: Turret lathes are characterized by their revolving turret, which allows for multiple tools to be used sequentially during turning operations. This feature makes them ideal for high-volume production of duplicate parts.
What is the name of the turning tool that is used to create a smooth and precise finish on a workpiece?
- Roughing tool
- Form tool
- Finishing tool
- Threading tool
Correct Answer: Finishing tool
Correct Answer Explanation: A finishing tool is a turning tool designed to create a smooth and precise finish on a workpiece. It has a small cutting edge radius and is used after roughing operations to achieve a desired surface quality.
What is the name of the device on a lathe that allows for turning a workpiece at a specific angle?
- Compound rest
- Taper attachment
- Follow rest
- Steady rest
Correct Answer: Compound rest
Correct Answer Explanation: The compound rest is a slide mounted on the main cross-slide of a lathe. It allows the tool to be fed at an angle to the axis of rotation, enabling the creation of tapers, angles, and other complex shapes.
What is the name of the turning operation that involves removing material from the inside of a hole to enlarge it or create a specific internal shape?
- Facing
- Turning
- Boring
- Threading
Correct Answer: Boring
Correct Answer Explanation: Boring is a turning operation that involves machining the inside of a hole to enlarge it, create a precise internal geometry, or create a specific shape. It is typically done using a boring bar and a cutting tool mounted on its end.
What is the term for the amount of material that is removed by a cutting tool during each revolution of the workpiece?
- Cutting speed
- Feed rate
- Depth of cut
- Tool clearance
Correct Answer: Feed rate
Correct Answer Explanation: The feed rate refers to the amount of material removed by a cutting tool during each revolution of the workpiece. It is a critical factor in determining the metal removal rate, surface finish, and cutting force.
What is the name of the turning tool that is used to create a specific profile or shape on a workpiece, such as a groove or a contour?
- Roughing tool
- Form tool
- Finishing tool
- Threading tool
Correct Answer: Form tool
Correct Answer Explanation: A form tool is a specialized turning tool with a pre-shaped cutting edge designed to create a specific profile or shape on a workpiece. It is used for creating grooves, contours, and other complex shapes that require a specific geometry.
What is the term for the rate at which a cutting tool moves across the surface of a workpiece?
- Cutting speed
- Feed rate
- Depth of cut
- Tool clearance
Correct Answer: Cutting speed
Correct Answer Explanation: Cutting speed refers to the rate at which a cutting tool moves across the surface of a workpiece. It is typically measured in feet per minute (fpm) or meters per minute (m/min).
What is the term for the distance between the centers of two adjacent threads?
- Thread depth
- Thread pitch
- Thread angle
- Thread diameter
Correct Answer: Thread pitch
Correct Answer Explanation: Thread pitch refers to the distance between the centers of two adjacent threads. It determines the fineness or coarseness of a thread.
What is the term for the angle between the flanks of a thread?
- Thread depth
- Thread pitch
- Thread angle
- Thread diameter
Correct Answer: Thread angle
Correct Answer Explanation: The thread angle is the angle between the flanks of a thread. It is an important parameter for determining the strength and fit of a threaded connection.
What is the term for the diameter of a thread measured at the top of the crests?
- Pitch diameter
- Major diameter
- Root diameter
- Crest diameter
Correct Answer: Major diameter
Correct Answer Explanation: The major diameter of a thread is the diameter measured at the top of the crests. It is the largest diameter of the thread.
What is the term for the diameter of a thread measured at the middle of the thread form?
- Pitch diameter
- Major diameter
- Root diameter
- Crest diameter
Correct Answer: Pitch diameter
Correct Answer Explanation: The pitch diameter of a thread is the diameter measured at the middle of the thread form. It is an important parameter for ensuring proper fit and engagement between mating threads.
What is the name of the turning tool that is used to cut internal threads?
- Boring tool
- Threading tool
- Form tool
- Tap
Correct Answer: Tap
Correct Answer Explanation: A tap is a specialized turning tool used to cut internal threads. It has a series of cutting edges that progressively engage the workpiece material, creating the desired thread profile.
What is the term for the process of removing metal from the surface of a workpiece to create a desired shape or dimension?
- Machining
- Turning
- Boring
- Threading
Correct Answer: Machining
Correct Answer Explanation: Machining is a general term for the process of removing metal from the surface of a workpiece to create a desired shape or dimension. It encompasses various operations, including turning, boring, milling, drilling, and grinding.
What is the name of the turning operation that involves creating a circular groove or indentation in a workpiece?
- Facing
- Turning
- Boring
- Grooving
Correct Answer: Grooving
Correct Answer Explanation: Grooving is a turning operation used to create a circular groove or indentation in a workpiece. It is often used to create grooves for lubrication, sealing, or other specific purposes.
What is the term for the process of using a cutting tool to shape or modify the surface of a workpiece?
- Machining
- Turning
- Boring
- Cutting
Correct Answer: Cutting
Correct Answer Explanation: Cutting is a general term that describes the process of using a cutting tool to shape or modify the surface of a workpiece. It is a fundamental operation in machining and encompasses various operations like turning, boring, milling, and drilling.