Automation device parts are determined by the shape and dimensions. The two elements (shape and dimensions) chosen by the designer significantly affect both the parts cost and the assembly cost of an automation device. The previous lecture #210 introduced the effects on the parts processing cost. In this section, we will explain the effects on the assembly cost.

• Pricing of an automation device will be determined by the following factors:

  

• Automation device parts consist of the following three design elements (shape, dimensions, and materials).

  

• Shape, dimension values, and materials of the parts greatly affect the parts processing cost.
• Dimensioning in the drawings is largely classified into the following two methods:

  

• Dimensioning based on the end face listed at a) has some disadvantages - it is likely to result in dimensional mistakes during an explosion from assembly drawing to detail drawing or combination errors in the assembly process.
• However, dimensioning based on the end face will be used more frequently for designs requiring high-precision assembly.
• Therefore, it is preferable to adopt the center baseline positioning as much as possible for assembly parts drawings of a common automation device.
• [Fig.1] is the design drawing of a circular part. Since this part is a circular shape, ID and OD dimensions are described based on the centerline.