6.9 Chapter Conclusion
Tim A. Bacon
Summary
A project plan shows the method for performing a machining operation, or series of operations. It may list items such as features to be machined, workholding required, machines to be used, and tools needed.
A job plan will always improve the process of building a part, but it will not always be required of the machinist to create one. When a person is newly hired as a machinist, a job plan will typically be provided. Parts from customers may contain a partial plan. The customer may require only metal cutting, and no grinding. As experience is gained on the job, the machinist may be called upon to help create a job plan for new products that come into the shop. Remember though, that it is important to determine at the start of a job if a plan has been provided before spending time on planning that has already been done. If a plan is provided, and the process of creating a plan is understood, the machinist may find an opportunity to improve the plan by implementing a change.
By visualizing and writing the steps required, the work will go more smoothly and efficiently. Start with a plan, and the project will be more enjoyable.
Review Questions
- Name four parts of the project plan.
- Why is tolerance important to the process plan?
- Why would you match the feature to be cut to a machine?
- Would an outside process affect the project plan?
- What role does workholding play in the manufacturing of a part?
- What does documenting the process do for the project?
- What is one factor to consider when choosing a tool to cut a feature?
- How will the sequence of features being cut yield different results?
- Why is it important to be specific about the workholding?
- What type of additional work could be done to a part after machining?