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This post was last edited by Tolerance Analysis on 2024-12-9 at 16:57. In the field of engineering design in manufacturing, there are \"hidden obstacles\" that cause numerous projects a great deal of trouble. Take the design of a three-dimensional reference system as an example; currently, most approaches still rely on the experience of senior engineers to navigate through these challenges. But this empirical approach is like looking at flowers through fog; it’s simply impossible to measure whether the benchmark system is stable or not using data. As a result, strange things kept happening frequently: at the critical stage when the product was ready for production, the molds behaved like stubborn children, the tooling would not cooperate, and the inspection equipment had all sorts of problems. Everyone had to keep making adjustments, in an effort to determine where the baseline targets should be set and what reasonable tolerances should be used. As a result, the matching and debugging process became a mess – time-consuming and laborious – with plenty of resources being wasted in this endless struggle. Think about it: if there were a way to break this deadlock, to turn baseline system design from something based on intuition into something based on precise criteria, thereby enabling smoother implementation, wouldn’t that give an advantage, allowing significant cost savings and the recovery of valuable time? Industry transformation can happen in an instant – are you ready to embrace new solutions? Three-sided datum system; key points: Overview of the application of datum systems in design. For standard design, a one-face-two-hole datum system is usually chosen, as it provides the most stable positioning. A great deal of resources is wasted in these endless attempts. The three-face datum system often leads to over-positioning, and it is generally not recommended to use a surface whose precision is lower than that of a hole. This approach is suitable for situations where high precision is not required, such as in the assembly of small parts like reinforcements or brackets. It is also useful in cases where it is impossible to locate holes due to design constraints, such as on door outer panels or front cover outer panels made of cast aluminum. In such situations, the raw material holes may be tapered, and the quality of the raw material surfaces may be poor. The three-face datum system focuses on selecting the appropriate order for the A, B, and C datums, designing the placement of these datums, and defining the geometric tolerances related to the A and B datums. *The diagram above shows common datum design schemes used in the three-face datum system. How can DTAS 3D overcome these challenges? ✔ Establishment of an accurate simulation for a three-face reference system ； ✔ Differences in the sequence of simulation benchmarks ； ✔ Quantify the differences in the number and location of the benchmark targets ； ✔ Visual evaluation: in the initial stage, the optimal three-dimensional reference system is precisely defined to ensure minimal assembly errors and robust positioning. For a video demonstration of the three-face datum system, click the link to watch it. Detailed steps: In DTAS 3D, select the tolerance system ISO, GB, or ASME. Create features in DTAS 3D – in this example, these include face features and hole features. Define datums A, B, C as well as various tolerances. Set up virtual measurements to verify whether the datums and tolerances have been defined correctly. Key points: DTAS 3D supports three tolerance systems – ASME/ISO/GB – and allows for the creation and simulation of various datum systems, including those with three faces, one face and two holes/pins, two faces and one hole, etc. DTAS 3D enables the evaluation of the reliability of datum systems through animations and virtual measurements, as well as the analysis of the impact of geometric factors. It also supports the visualization of the relationship between linear tolerances and datums. Follow the official account for more information