File Transfer&Types Of File Translators
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File translation is a process in which one data format is converted into another. File translators are written independently by each CAD or CAM software company. Some design teams may use several different types of CAD packages to communicate with different teams or complete specific functions. One design model may be exported and imported into several CAD packages before the final file reaches manufacturing. Then you're counting on your CAM system's import translator to successfully filter through the result of the previous translations.
A common source of error in part files is receiving incomplete designs due to inexperienced or overworked CAD designers. You may not receive a complete model, or details that the translator is expecting may be omitted or lost. Or your CAM translator may not be fine-tuned enough for the specific CAD file format you are importing. So you will find the translating process offers plenty of room for error and miscommunication.
Types Of File Translators
There are numerous file formats on the market today. You can encounter IGES, CADL, DXF, ASCII, NCAL, PAR, PRT, SAT, SUP, STL, X_T, MODEL, the various European and American automotive formats, and other file extensions. Also, the CAD/CAM software manufacturers develop proprietary formats for their software. So one true conversion standard is not yet possible.
Currently, there are basically two types of file translators—neutral and direct. Neutral translators are used to convert a proprietary CAD or CAM data format into a generally agreed upon industry standard. They are documented and available for anyone to use. The primary neutral translators today are IGES for surface data and X_T or SAT, which were developed for solid modeling data.
The idea of using neutral file formats is a good theory. In reality, however, each CAD package has its own exclusive properties and methods for packaging geometric data. A common term in the industry is "flavors," which means that a CAD export translator will start with a neutral format, such as IGES, and may add its own unique slant. Therefore, the results are not truly common to all in the industry. A CAM package must interpret the modified neutral translator. As new versions are introduced, the CAD translators must also be revised. So, in turn, CAM companies must upgrade the importing translator specifically for each new CAD version to eliminate compatibility issues.
Direct translators can exchange data directly into the CAD software's proprietary format. The ability to integrate seamlessly between software packages is the best situation for manufacturing shops because data transfer errors are virtually eliminated. By directly transferring files you're eliminating the "middleman." In the end, less time is expended on data transfer issues so you're effectively reducing the product's manufacturing cycle.
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