Cordless Drills
Cordless Drills

Scope The use of the cordless drill is varied and depends much upon the “bit” placed in the chuck. Though these bits are important, our focus will remain on the operation of the drill itself.

Needs and Requirements There are certain customer needs that the drill should address: battery life, portability, comfort, durability and the ability to p...

Scope The use of the cordless drill is varied and depends much upon the “bit” placed in the chuck. Though these bits are important, our focus will remain on the operation of the drill itself.

Needs and Requirements There are certain customer needs that the drill should address: battery life, portability, comfort, durability and the ability to perform in unusual places. In addition to that however, there are certain requirements that should be expected of the cordless drill. Like in the customer needs, the drill should have a long lasting battery and be portable. It also should be safe, have reliable parts and in general be more convenient than a conventional corded drill.

System Function The drill is activated by depressing the trigger on the front of the handle. The result is the chuck spinning at a speed proportional to the degree to which the trigger is depressed. To effectively use the drill, it is necessary for the user to have decent hand strength and finger control to insert the bit as well as keep the drill from spinning out of their hand. In addition, proper use must be defined by the environment the drill is used in factoring in good lighting, reasonably low ambient noise and a lack of excessive moisture (like rain) getting into the casing.

Manufacturing The drill seems very cost effective, with a low number of parts, most if not all of which are mass produced with techniques like injection molding. From an assembly perspective, the drill seems well designed. The frame for example snaps together and is then secured with screws. One area for improvement could be in the number of types of screws used. We found five distinct screw types and feel four of these sizes could have been consolidated.

Failure Modes and Effect Analysis Potential problems in the drills operation may stem from the clutch, chuck, battery and case. For the clutch, the action is very stiff and doesn’t change direction very easily. This could lead to fracture from the user using too much force. For the chuck, break failure is possible and for the case, ergonomics might be lacking making for an uncomfortable grip. The problem we see as most important though is in the battery. The power seems very low and our recommendation is to find a higher quality battery to replace the 9.6V.

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