What is drill and mention any five types of drilling machines and state any four operations that are commonly performed on drilling machines and drill bits are usually gripped by and the operations of sizing and finishing a hole already made by a drill is referred to as and drills that are powered by compressed air may be referred to as
Drilling is a machining process that involves creating a hole in a solid material using a rotating cutting tool called a drill bit. Drill bits are designed with sharp edges and helical flutes to aid in cutting and chip removal during the drilling process.
Here are five types of drilling machines commonly used in various industries:
1. Bench Drill Press: This type of drilling machine is mounted on a workbench and is suitable for small to medium-sized drilling operations.
2. Radial Arm Drill Press: These machines have an adjustable arm that can be moved horizontally, allowing drilling operations on larger workpieces.
3. Magnetic Drill Press: These machines are portable and have a magnetic base that adheres to metallic surfaces, making them ideal for drilling in hard-to-reach areas.
4. Handheld Drill: This is the most common type of drilling machine used by individuals for household tasks, maintenance, and light drilling in various materials.
5. Mill Drill Machine: This machine combines both drilling and milling capabilities, allowing for precise hole drilling and milling operations.
Common operations that can be performed on drilling machines include:
1. Drilling: Creating holes in a workpiece using a drill bit.
2. Reaming: Enlarging and smoothing the hole using a reamer, which makes the hole more precise and accurate.
3. Counterboring: Enlarging the entrance of a drilled hole to accommodate a fastener or bolt head, allowing it to be recessed.
4. Countersinking: Enlarging the entrance of a drilled hole to create a conical recess for a screw or bolt, so that its head sits flush with or below the surface.
Drill bits are usually gripped by a chuck, which is a device that clamps onto the shank of the drill bit, holding it securely in place during drilling.
The operation of sizing and finishing a hole already made by a drill is referred to as boring. Boring typically uses specialized boring tools or boring bars to enlarge an existing hole with better precision and accuracy.
Drills that are powered by compressed air are commonly referred to as pneumatic drills or air drills. They utilize compressed air to power the drilling action and are often used in industries where electricity is not readily available or flammable materials are present, such as in mining or construction sites.