We can distinguish between several characteristics that contribute to easy and economical manufacture:
1. Simplicity of design
2. Design for large tolerances
3. Avoidance of unnecessary problems
4. Correct tolerances
5. Reasonable performance specification
6. Optomechanical design.
These topics are, of course, all interconnected, and it is slightly artificial to separate them. In this chapter we will discuss only the first four characteristics. Optomechanical design is really a separate subject, and is not considered here. For those interested, we recommend three references by P. Yoder and R.E. Hopkins.
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