Lesson 9 of 12: Tolerancing Complex Assemblies with Multi-Level Geometric Controls and Varying Datum Structures
This 59 minute CD-ROM or DVD focuses on the application of appropriate datum structures and geometric tolerances to a part that is both challenging and realistic. Participants are treated to a detailed analysis of the optimal use of datums and geometric controls that escalate in sophistication as the product definition progresses from beginning to end.
Form, orientation and location controls are added in what is determined to be the most functional and producible approach possible. Tolerances are calculated and distributed between three parts in this assembly. Geometric controls are converted to multi-level/two single-segment controls for cost reduction and compatible mating conditions. Tolerances are analyzed and minimum wall thicknesses protected.
New formulas are introduced for analysis and worst case boundaries for the first time in this session. Datum structures are changed for direct tolerancing relationships throughout the assembly for ease of manufacture, functional inspection and to produce the greatest yield of functional parts. This session is jam-packed with new information and reinforcement of previously discussed concepts. Exciting and fun!
[NOTE: This CD-ROM or DVD discusses some of the most critical and difficult concepts of geometric definition. We recommend viewing it in sequence to avoid confusion.]
Topics discussed are:
• Varying Datum Structures
• Multi-Level Geometric Controls
• Projected Tolerance Zones for Threaded Holes
• Manufacturing Sequencing through Geometric Symbology
• Form, Orientation and Location Controls Properly Sequenced
• Distributing Tolerances Throughout the Assembly
• Pattern Shift with Datum Features at Maximum Material Condition
• Tight Tolerances to Critical Datums and Looser Tolerances to Less Critical Datums
• Multiple Virtual Condition Boundaries
• Minimum Wall Thickness Calculations
• The Key Questions to Ask That Lead One to the Optimum Controls
• Two Single-Segment Positional Controls vs. Composite Positional Tolerancing
• Zero Positional Tolerancing at MMC
• Linear Logic of Geometric Product Definition