We have all seen prints with many datum reference frames on them. The fact that there are multiple sets of datum’s is not an issue and is put in place for functional design reasons. There can be so many that they look like an alphabet soup. But what about raw castings? Generally the functional part datum reference frame(s) have not yet been cut into the parts yet. This where casting datums come into play. They are typically designated as X-Y-Z or Z-Y-X.
https://www.3d-engineering.net/wp-content/uploads/2021/01/CastingDatums.jpg 279 550 Rob Glassburn https://www.3d-engineering.net/wp-content/uploads/2018/02/3d-engineering-logo.png Rob Glassburn2021-01-19 15:59:472021-01-19 16:11:33What are Casting datums?