Application of Tolerance Charting Using Rooted Tree Graph for Allocating Manufacturing Specifications onto the Precision Machined Part: Detailed Explanation of Manufacturing a Standard Weight of Mass

摘要

Since objective of mechanical - process planning is achievement of the target - designed specification, a created process plan needs to be assessed prior the actual machining operations. For this respect, tolerance charting integrated with rooted tree graph is the most appropriated tool. Even through, this technique has been implemented into processes planning for many decades, but it still has been not widely used in practicality. Except its complexity by procedure and time consuming, the major reason that leads it rarely be used is closely relation between tolerance charting and machining sequences themselves. Process planner who creates a tolerance chart needs to possess the firmly backgrounds of manufacturing processes and machining operations. Unfortunately, there are many literatures reported on the successful of using tolerance chart for manufacturing, but they just give quite a few information for machining processes and sequences. Certainly, it is too hard for the readers who have less knowledge on machining operations can understand this technique completely. Therefore, this paper aims to explain how to create and work with tolerance charting in more details of machining information that has been overlooked by many literatures, and leads this technique looked too much difficult than it should be. Tolerance charting using rooted tree graph is explained and illustrated with an example of manufacturing the standard weight (of mass) by a precision manufacturer in Thailand.