4th Form Mechanical Engineering Technology

The given statement is true. Drilling refers to the process of using a drill to create a hole in a workpiece. This is a common method used in various industries such as construction, manufacturing, and woodworking. Drills come in different sizes and types depending on the specific application. The drilling process involves rotating the drill bit and applying downward pressure to cut through the material and create a hole.

Oil spilled on the floor of the workshop is an example of a hazard because it poses a potential danger or risk to the people working in the workshop. A spilled oil can create a slippery surface, increasing the likelihood of accidents such as slips, falls, or even fires if it comes into contact with a heat source. This hazard needs to be addressed promptly to ensure the safety of the workshop and its workers.

The part labelled 8 on the drilling machine is called the motor. The motor is responsible for providing the power and motion required for the drilling machine to operate. It converts electrical energy into mechanical energy, which drives the drilling mechanism. Without the motor, the drilling machine would not be able to function properly.

The tap drill size is indeed the drill size that ensures there is enough material in the hole for the tap to create a thread. This is important because if the hole is too small, the tap may not be able to properly cut the thread, resulting in a weak or ineffective connection. On the other hand, if the hole is too large, there may not be enough material for the tap to grip onto, again leading to a poor thread. Therefore, it is crucial to use the correct tap drill size to achieve a successful threaded hole.

The pitch of a hacksaw blade refers to the number of teeth present on the blade per inch. This means that the higher the pitch, the more teeth there are per inch, resulting in a finer cut. Therefore, the statement "The pitch of a hacksaw blade is the number of teeth per inch" is true.

Taps are indeed used to cut internal threads on a workpiece. They are tools with sharp cutting edges that are used to create threads inside a hole or opening. By rotating the tap into the workpiece, it cuts grooves that form the internal threads. This process is commonly used in industries such as manufacturing and engineering, where threaded holes are necessary for various applications. Therefore, the statement "Taps are used to cut internal threads on a workpiece" is true.

The part labelled 4 on the drilling machine is called a drill chuck or simply a chuck. A drill chuck is a device that holds the drill bit securely in place, allowing it to rotate and drill into the desired material. It is an essential component of a drilling machine as it provides the necessary grip and stability for the drill bit to perform its function effectively.

The statement is true because the cuts of files do indeed refer to the pattern of their teeth. Files are tools used for shaping and smoothing surfaces, and they have different types of cuts on their teeth, such as single-cut, double-cut, or rasp-cut. These different patterns determine the aggressiveness and effectiveness of the file for different materials and purposes. Therefore, the statement accurately reflects the relationship between the cuts of files and the pattern of their teeth.

The part labelled 6 on the drilling machine shown in Figure 1 is called the base. The base is the bottom part of the drilling machine that provides stability and support for the entire machine. It is usually made of a heavy and sturdy material to ensure that the machine remains steady during operation. The base also often includes adjustable feet or leveling mechanisms to ensure that the machine is properly aligned and balanced.

The crest of a thread refers to the highest point or the top surface that connects the sides of the thread. This means that the crest is the part of the thread that is visible and can be felt when running a finger along the thread. Therefore, the statement that the crest of a thread is the top surface joining the sides of a thread is true.

Phillips screwdrivers typically have a star-shaped tip, also known as a cross-head or cruciform shape. This design allows the screwdriver to engage with the corresponding Phillips screws, which have a cross-shaped indentation in the head. The star-shaped tip provides better grip and reduces the chances of the screwdriver slipping out of the screw head while turning, making it easier to drive and remove Phillips screws. Therefore, the statement "Phillips screwdrivers usually have a star-shaped tip" is true.

A scriber is a tool that is used to mark lines on a work piece during the layout process. It typically has a sharp point or edge that can be used to make precise and accurate markings on various materials. This tool is commonly used in woodworking, metalworking, and other crafts where precise measurements and markings are necessary for accurate cutting and shaping of the work piece.

The spindle carries the grinding wheels and is driven by a belt connected to the motor. It is responsible for rotating the grinding wheels, allowing them to perform their grinding function.

Solid dies are used for chasing or re-cutting threads that are damaged. This means that when a thread on a bolt or nut is damaged or worn out, a solid die can be used to repair or recut the thread. Solid dies are typically made of hardened steel and have cutting edges that match the thread pitch and diameter. They are designed to be used with a die handle or wrench to manually turn and cut the thread. Therefore, the statement "Solid dies are used for chasing or re-cutting threads that are damaged" is true.

The part labelled 5 on the drilling machine is called a table. It is specifically referred to as a drill press table or an adjustable table. This is the flat surface on which the workpiece is placed and secured during the drilling process. It provides stability and support to ensure accurate and precise drilling.

A divider is a tool that is used to scribe arcs, circles, and step-off distances on a workpiece. It consists of two pointed legs connected by a hinge, allowing the distance between the points to be adjusted. By placing one point on a fixed position and using the other point to scribe, the divider can accurately mark out circles, arcs, and distances on the workpiece. This makes it a useful tool for layout and measurement tasks in various industries such as woodworking, metalworking, and engineering.

A try-square is a tool that is used to layout lines at a right angle to a machined edge. It consists of a handle and a metal blade that is perpendicular to the handle. The blade is placed against the machined edge, and the handle is used as a guide to draw a straight line at a perfect 90-degree angle. This tool is commonly used in woodworking, metalworking, and other trades where precise measurements and angles are required.

High speed steel is the correct answer because it is a type of tool steel that is specifically designed for use in drills and other cutting tools. It has a high resistance to heat and wear, allowing it to maintain its hardness and cutting ability even at high speeds. This makes it ideal for drilling through tough materials such as metal. Mild steel, stainless steel, and low carbon steel are not typically used to make drills as they do not have the same level of hardness and durability as high speed steel.

The correct answer is true because using the hacksaw at 40 - 50 strokes per minute is the recommended speed for efficient and effective cutting. Operating the hacksaw at this speed allows for better control and accuracy while minimizing the risk of the blade becoming dull or breaking. Using a faster or slower speed may result in a less precise cut or damage to the saw or the material being cut.

The grinding head is indeed the top part of the grinding machine that houses the spindle. It is responsible for holding and rotating the grinding wheel, which is used to remove material from a workpiece. This component plays a crucial role in the grinding process, allowing for precise and efficient grinding operations to be performed. Therefore, the statement that the grinding head is the top of the grinding machine housing the spindle is true.

The given statement is true because a pillar drilling machine is indeed a type of drilling machine commonly found in workshops. Pillar drilling machines are stationary machines that are used for drilling holes in various materials such as wood, metal, and plastic. They are equipped with a vertical column or pillar that provides support and stability during the drilling process. These machines are commonly used in workshops and manufacturing facilities for various drilling applications. Therefore, the statement is correct.

The tension is given to the blade of the hacksaw using the wing nut. The wing nut is a type of nut with two large metal "wings" on its sides, allowing it to be easily tightened or loosened by hand. In the case of a hacksaw, the wing nut is used to adjust the tension of the blade, ensuring that it is securely held in place and able to cut through materials effectively. By tightening or loosening the wing nut, the user can control the amount of tension applied to the blade, making it easier to cut through different materials.

The correct answer is "hardened at the teeth." This means that only the teeth of the flexible blade are hardened, while the rest of the blade remains unhardened. This is a common practice in the manufacturing of blades, as it allows for a balance between flexibility and durability. By hardening only the teeth, the blade can maintain its flexibility while still being able to effectively cut through materials.

The combination set typically includes a steel rule, square head, and center head. This statement is true because these tools are commonly found together in a combination set. The steel rule is used for measuring, the square head is used for marking and checking right angles, and the center head is used for finding the center of round objects.

Tapping is the correct answer because it refers to the process of cutting internal threads by hand. This involves using a tap, which is a tool with sharp cutting edges that is inserted into a pre-drilled hole. The tap is then rotated and guided into the hole to create the internal threads. This process is commonly used in metalworking and plumbing applications to create threaded holes for screws, bolts, or fittings.

Dies are not used to cut all types of threads on a work piece. Dies are used specifically to cut external threads, while taps are used to cut internal threads. Therefore, the correct answer is False.

The part labelled 7 on the drilling machine shown in Figure 1 can be referred to as either Vee Belt and Pulley or V Belt and Pulley. It is also commonly known as a pulley.

The hammer most frequently used by machinists is the ball peen hammer. This type of hammer has a flat face on one side and a rounded, ball-shaped peen on the other side. The ball peen hammer is commonly used in metalworking and machining tasks because the peen can be used to shape and bend metal, while the flat face is used for striking and driving. Its design makes it versatile and suitable for various applications in the machining industry.

The part labelled 9 on the drilling machine is called a column. The column is a vertical structure that provides support and stability to the drilling machine. It holds the drill head and allows for vertical movement, enabling the drilling process. The column is an essential component of the drilling machine as it ensures accuracy and precision in drilling operations.

The size of a hammer is usually determined by the weight of its head. The weight of the head affects the force and impact that the hammer can deliver. A heavier head will generate more force, making it suitable for heavier tasks, while a lighter head is more appropriate for lighter tasks. The length of the handle and the size of the face may vary depending on the specific use of the hammer, but the weight of the head is a key factor in determining its size.

Vise-grip pliers are known for their adjustable lever action, which allows for a strong gripping power. This feature enables the pliers to securely hold onto objects, providing a high level of control and stability. Slip-joint pliers, needle-nose pliers, and side cutting pliers may have their own unique features, but they do not specifically mention the adjustable lever action that Vise-grip pliers possess. Therefore, Vise-grip is the correct answer in this context.

Flexible blades are not hardened throughout and are often found in the workshop.

Adjustable wrenches are a category of wrenches that have a movable jaw, allowing the user to adjust the size of the opening to fit different sizes of nuts and bolts. This feature makes adjustable wrenches versatile and suitable for a wide range of applications. Solid-end wrenches, boxed-end wrenches, and hexagonal wrenches are also types of wrenches, but they belong to different categories.

The correct drill size for drilling a hole for an M 42 x 4.5 mm thread is 37.5 mm. This means that a drill bit with a diameter of 37.5 mm should be used to create the hole for the thread.

The statement suggests that all-hard blades are hardened throughout their entire length. This means that the hardening process is applied uniformly from one end of the blade to the other. Therefore, the correct answer is True, indicating that the statement is accurate.

The statement is false because Phillips screwdrivers are not known as standard screwdrivers. Phillips screwdrivers have a specific design with a cross-shaped tip that is designed to fit into Phillips screws, while standard screwdrivers have a flat tip that is used for a wide range of screw types.

Ductility is the property of a metal to be drawn into fine wires. It refers to the ability of a material to deform under tensile stress, allowing it to be stretched into a wire without breaking. This property is important in various industries, such as electrical wiring and jewelry making, where metals need to be formed into thin and flexible shapes. Annealing, malleability, and softness are not specifically related to the ability to be drawn into wires, making ductility the correct answer.

The outside caliper is not used for checking inside diameters. Outside calipers are used to measure the external dimensions of an object, such as the outer diameter of a cylinder or the width of a groove. Inside calipers, on the other hand, are specifically designed to measure the internal dimensions of an object, such as the inner diameter of a hole or the distance between two parallel surfaces. Therefore, the statement is false.

The root is the bottom surface joining the sides of two adjacent threads.

The dot punch usually does not have a point angle of 90°. The dot punch is a tool used for marking or indenting a surface with a small dot or indentation. It typically has a rounded or pointed tip, rather than a 90° angle. Therefore, the correct answer is False.

The second cut grade of file has the closest spacing between its teeth compared to the other options. This means that the teeth are more closely packed together, resulting in a finer and smoother finish when using the file.

The given question asks for the type of wrench that is NOT included in the list. The options provided are box-end, allen or hexagonal, offset, and sockets. The correct answer is "offset" because all the other options are types of wrenches commonly used for different purposes. A box-end wrench has a closed loop at one or both ends, an allen or hexagonal wrench has a hexagonal-shaped head, and sockets are used with a ratchet handle. However, an offset wrench refers to a type of wrench with an angled or bent handle, which is not mentioned in the list of options.

The proper sequence of tapping a blind hole is tapered, plug, bottoming. Tapered tap is used first to gradually cut threads into the hole, allowing for easy starting and alignment. Then, a plug tap is used to fully cut the threads to the desired depth. Finally, a bottoming tap is used to finish the threads at the bottom of the hole. This sequence ensures proper thread formation and depth in the blind hole.

The given question asks for the type of grinding machine that is NOT included in the list. The options provided include buff and grinder, bench grinder, pedestal grinder, and floor grinder. The correct answer is floor grinder because it is the only option that is not a type of grinding machine. Buff and grinder, bench grinder, and pedestal grinder are all types of grinding machines commonly used for various purposes.

A diamond point chisel is used to clean out corners and pull over off-drilled centers. The sharp and pointed tip of the diamond point chisel allows for precise and accurate work in tight spaces. It is commonly used in woodworking and metalworking to remove excess material and create clean and precise corners. The diamond point chisel's shape and design make it ideal for tasks that require precision and control.

The part labelled 1 on the drilling machine shown in Figure 1 is called the belt cover.

The part labelled 10 on the drilling machine is called the table lock, lock, or locking screw. This component is responsible for securing the table in place during drilling operations, ensuring stability and accuracy. It prevents any unwanted movement or shifting of the table while the drilling machine is in use.

The tool rest is not fixed over the wheels to protect the user from the grinding wheels. The tool rest is actually used to support the workpiece and provide stability during the grinding process. It is positioned slightly above the grinding wheels to allow the user to safely maneuver the workpiece while minimizing the risk of accidents or injuries. Therefore, the correct answer is False.

The question asks for the option that is NOT an example of dies used in thread cutting. A plug is a type of die that is used to cut internal threads, while solid, circular split, and adjustable screw plate are all examples of dies used to cut external threads. Therefore, the correct answer is plug.

The size of a screwdriver is determined by the length of the shaft. The length of the shaft determines the reach and depth that the screwdriver can achieve. It is important to have the right size of screwdriver for the job to ensure proper fit and effectiveness. The shape of the tip and the length of the handle may vary for different types of screwdrivers, but the length of the shaft is the key factor in determining the size.