.The design is a device or simple tools such as knife, a nail or screw, one should be analyzed. And designed by the principles of design, the problems and real variable are often very complex.Use value and safety in design (safety factor) as part of the joint, or compensation, which is directly related to the reliability. (Reliability).(Mass Production) calculation and selection of parts must be done carefully. Just in case, too much will make the production cost rise. While the design is lax may result in broken parts or use did not affect the quality.To achieve the functions of the tool results too. May be designed in a variety of ways. The basic knowledge of a wide range of engineering were used together to do the design tools.Vibration characteristics, flow, etc., good designers should have the basic knowledge of the following (singular ตันตร, do visit2553: 9).
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