Evrim Berk 030060161 5th Week

N-Code: A part program block usually begins with an "N" word. The N word specifies the sequence number. It is used to identify the block within the program. It is especially useful for program editing. For example, when the format is "4", a proper sequence number would be N0010. It is a good practice to program N values in increments of 10 or greater. This allows additional blocks to be inserted between two existing blocks.

(Computer Aided Drawing 2nd Edition, Chang T.C., Wysk R.A., Prentice Hall, 1998, Page:365)

Articulated Robots: An articulated robot has three rotational axes connecting three rigid links and a base. An articulated robot is frequently called anthropomorphic arm because it closely resembles a human arm. The first joint above the base is referred as the shoulder. The shoulder joint is connected to the upper arm, which is connected at the elbow joint. Articulated robots are suitable for a wide variety of industrial tasks, ranging from welding to assembly. Similar to other types of robots, the X, Y and Z coordinates of an articulated robot can be obtained from the joint variables using the following equations.β

X=[l1cosβ + l2cos(β+ɣ)]cosα

Y=[l1cosβ + l2cos(β+ɣ)]sinα

Z=l1sinβ + l2sin(β+ɣ)

where α, β, ɣ are joint variablesi and l1 and l2 are the lengths of the lower arm and upper arm, respectively.

(Computer Aided Drawing 2nd Edition, Chang T.C., Wysk R.A., Prentice Hall, 1998, Page:428)

Axiomathic Approach: The axiomathic Approach is the result of a scientific search for the basic principles of design by Nam P. Suh of the Massachusets Institue of Technology. The complete ddetails of this approach is the basis of the following presentation.

The axiomathic approach is based on the assumption that there exists a fundamental set of principles that determines good design practice. Phrased differently, there should exist common factors in all good designs. These factors are fundamentally principles of design can be applied to all design situations, like the natural laws in natural science problems. These principles are the basis for the solution and process optimization, using emprical knowledge and mathematical tools. This method is based on two fundamental principles, or axiomsi that it followed adequently result in good design. The Independence Axiom and The Information Axiom.

(Computer Aided Drawing 2nd Edition, Chang T.C., Wysk R.A., Prentice Hall, 1998, Pages: 605-606)

Hitachi Assembly Method: This method was originally developed in Japan in 1976 by Hitachi. This method is an effective tool for quantitatively eveluating the product-design quality for assembly producibility at early design stages. In the conventional product-design procedure, redesigning required so much time that products with poor producibility characteristics were manufactured. To counteract this, the HAM approach to product design includes two feedback loops to check for good producibility characteristics: one at the conceptual designing stage, and the other one at the detail designing stage. This procedure results in less product development time and in a more economical solution to the design problem.

For its application HAM requires information available at the early stages of the product-design process. Conceptual drawings, for example, could be used to carry out this analysis.

(Computer Aided Drawing 2nd Edition, Chang T.C., Wysk R.A., Prentice Hall, 1998, Pages: 603-604)