STUDY OF POWER TOOLS Fig.1 Power Drilling Machining Power Drill • Has different chuck capacities, such as 1/4”, 3/8” or 1/2”. For example, 1/4” means that is the largest diameter shank that will fi t the chuck. The speed of the drill also increases with the size. • Motor load limit can be light-, medium- or heavy-duty. The higher the amp rating, the more powerful the drill. Drills rated at 2A are generally considered light-duty drills, while 5A drills are considered heavy-duty. • Use a chuck to tighten the drill bit in place. A keyed chuck uses a rotary key to tighten and loosen the chuck. You can tighten a keyless chuck by hand. • Another feature on some drills is variable speed. Variable speed drills allow you to control the drill’s revolutions per minute, usually by varying pressure on the trigger switch. Some models also allow you to vary the torque. Higher torque is better for driving screws, and higher speed is better for drilling holes. • A drill should also have a reverse, which allows you to back a drill bit out from the hole. 1 Fig.2 Wrench Gun Drives or loosens long screws, bolts and other fasteners. • Where a hammer drill operates with a back-and-forth, hammer-type motion, an impact driver applies a rotary force. In addition, an impact driver applies a high-pressure torque when it encounters a higher opposing torque. • While this tool can be used to drill holes, it is not suited for delicate tasks, as its high power could cause damage to the work piece. • This tool requires a special hexagonal shank bit. • It is also non-reactionary, meaning that while a regular drill will seize and twist in your hands if it encounters resistance, an impact driver will not. • It is lightweight and easier to handle than a drill. It is also very loud, so you should use hearing protection when operating one. Power Screwdriver 2 There are several types of power screwdrivers. • A common type is a variable-speed, reversible drywall screwdriver. It drives drywall, decking and other self-drilling screws. It offers higher speeds than a power drill. • A cordless screwdriver is handy for light-duty household applications. It has less power and speed than a power drill, but is easier to handle. Upselling Skills Gear construction is a key factor in determining quality. Less expensive drills have plastic gears. More expensive models have metal gears and will have longer life. However, some highend models use high-impact plastic, which is lightweight and just as durable as metal. • Better drills have convenient features such as a built-in level or a depth gauge. • Some drills might have a D-handle or side grip mounted on the housing to improve leverage. • An electronic brake causes the drill to stop as soon as you release the trigger. (Typical drills take a few seconds to wind down). Braking gives you more control over the device. • Better cordless drills have brushless motors. Standard drills use brushes to relay a charge to the motor. Brushless motors instead are controlled by a microprocessor chip. This is a more efficient design that results in a longer battery run time, as well as more power and durability. • Better drills have variable speed and a reversing action. • Some drills include built-in LED lights to help illuminate the area where you are drilling. • Better batteries have a fuel gauge that allows you to see if it’s time to charge the battery. hand grinding machine An angle grinder, also known as a side grinder or disc grinder, is a handheld power tool usfor grinding (abrasive cutting) and polishing. 3 Types of grinding machine • • • • • • Bench Grinder. These types of grinding machines are fixed on a workbench or table. Hand Grinder. This grinder is also fixed on the workbench or table. Pedestal Grinder. Types of Grinding Machines – Pedestal Grinder. Portable Grinder Flexible Grinder Precision Grinder Working principle of Grinding Machine: • • • • The working principle of a grinding machine is quite easier to understand. In a grinding machine, there is an electric motor which supplies the motion power to the grinding wheel with the help of a belt and pulley. So when we start the electric motor the motor rotates at a certain rpm (150-15000 RPM, it may change according to the types of grinding machine) with the help of vbelt and cone pulley the grinding wheel also starts rotating and we perform the operation. Here below I mention the various types of grinding machines with their working. Before Fitting 4 Pipe Clamps PVC Pipe After Fitting with concrete After Fitting with wood Drilling and Fitting of PVC Pipe in different Walls and Materials 5 EXERCISE NO.: DATE: AIM: To perform drilling and fitting of pipe and clamps in different walls and positions using power Tools. MATERIAL SUPPLIED: Cylindrical PVC pipe of 30 mm and length 80 mm and clamp 30 mm. TOOLS REQUIRED: 1. Power Drill 2. Power Screwdriver 3. Raw plug 4. Clamps 5. Pipes PROCEDURE: 1. The given work piece is checked for its dimensions. 2. The Hole is marked using marking tools before drilling 3. The Drilling is made on wall / wooden for required dimension and raw plug is instead in hole. 4. The pipe and clamp is positioned Screwed by means of Power screw driver 5. The unscrewed using power screw driver and removal od pipe and clamps Results Evaluation Table S.No Description Max Marks 1 Preparation of Work 20 2 Completion of work 40 3 Dimensions and Accuracy of fitting and clamping 20 4 Viva-vice 20 TOTAL Marks Awarded 100 Signature of Faculty In charge VIVA VOCE QUESTIONS 6 1. Define Drilling 2. List of Power Tools 3. List the Different types of Walls 4. State power chuck 5. Classify types of drill machine . 7
