Power hand drill Essay Example | Topics and Well Written Essays - 3750 words

Power hand drill - Essay Example The grouping or classification of hand drills depends mainly by the maximum size of drill bit shaft that the drill chuck can hold. A power drill comprises mainly of two sub-systems, which are mechanical and electrical. The two sub-systems play specific, different, and important roles in the working of the electrical hand drill. The first subsystem, which is the mechanical, has components, which transfer, translate, and apply forces in the hand drill. The electrical subsystem mainly deals with power. It has components that supply and control power flow in the hand drill. In this paper, we look on how to design an efficient and functioning hand drill. We will have a list of each mechanical component, the materials of the parts and the mechanical properties of this material. After designing the hand drill, we try to look on how to improve it to work more efficiently. Specifications of the hand drill 1. The input power is 800w 2. Its speed is 0-800rpm 3. Has a chuck capacity of 10mm 4. D rill capacity (a) Steel: 13mm (b) Wood: 25mm Mechanical components of the hand drill. Frame Shigley, (2008 Pg. 23) This is the outer part of the hand drill and it covers the inner mechanical and electrical components. One can also refer it to the housing. This component comprises of hard plastic. The mechanical property behind the idea of using the plastic is that it is a poor conductor of heat and electricity. Since the hand drill produces heat as it is in use, the frame does not get to harm or burn the user since its conductivity to heat is very low. Plastic also makes it safe for the user to use, as the risk of electric shock is minimal. This part is to be high smooth hence polishing is very important as it should be comfortable for the user to hand while using it. Plastic also makes the machine to be less heavy and the user can comfortably carry it without straining and in case of any accidents, the user is less likely to be less hurt by the frame as it is of plastic in nature. Two gears assembly Shigley, (2008 Pg. 23) There is transmission between the chuck and the motor. This transmission consists of pears of gears. We use gears from alloy steel elements for example stainless steel. Gears require materials of have a high resistance to corrosion. Steel gears offer high strength and has a wide range of heat treatment properties. Steel gears are also very durable and they provide the highest strength. Austenitic stainless steel is non-magnetic and has good corrosion resistance. These are the mechanical properties of this material. They can also be martensitic stainless steel that is easy to harden with heat, has magnetic properties, and have reasonable resistance to corrosion. This stainless steel (martensitic) is more appropriate to use as there is a high power ratings and it will therefore make the machine more effective Chuck Shigley, (2008 Pg. 23) It comprises the outer and front section of the hand drill. It has jaws, which holds the drill bits in posi tion. We use a chuck that has three-jaw attachment that applies radial gripping to certain number of drill bits and accessory shafts. Chucks from stainless steel are the most appropriate. They provide high resistance to corrosion, as they are mainly hard. This mechanical property makes it more suitable as it is always in contact with the drill bits, which are always in constant motion and act on materials of different hardness. Stainless steel also lasts longer and it is