4.15 Chapter Conclusion
D.M. Donner
Summary
If you can’t measure it, you can’t make it. This is a basic truth in precision manufacturing. A large part of our job is measuring our work to ensure it falls within acceptable standards as outlined by the engineer.
This chapter has provided you with a basic understanding of measuring equipment, which will allow you to begin the journey in precision machining. With an understanding of these basic tools, you can discern if the parts you are making are within tolerance or if adjustments need to be made.
Review Questions
- State the difference between a gage and a direct measurement device?
- Why do gage pins come in minus and plus sizes?
- Explain the rule of 10X?
- How does wringing hold gage blocks together?
- A thread plug gage is ground to maintain which thread characteristic?
- What is the most common measuring tool for the machinist? And how many ways can it measure?
- List the different methods by which direct-read measuring tools display dimensions.
- How far does one rotation of a micrometer thimble advance?
- List the measuring tools used to measure a bore.
- Demonstrate how to speak this dimension: 1.3755″
- Define outside dimension.
- Define inside dimension.
- List the attachments used on height gages.
- Explain the difference between vernier and digital equipment.
- Explain why gage pins are ground under-sized.