Is there a way to use a curve feature as a datum in Calypso? I don't think it makes sense to and I understand why that wouldn't be an option but I don't know for sure. The other issue is that other callouts use A-B-C so I kind of need datum B to be a single feature ![]() that exist between the geometric tolerance zones and the datum reference frame. Consequently datum feature B applies at its MMC or 4.020 in diameter, and datum feature simulator B on the gage in Figure 7-8B is produced at a diameter of. This means the datum simulator for datum feature B would have a theoretical design size of 19.6. I tried using the line as my secondary datum and the point as my tertiary datum but the features are so small that any slight deviation results in a bad profile of datum C. from the theoretical datum feature simulator. On the drawing shown below, datum feature B, in the position callout of the four hole pattern, is modified at MMC. I can't make datum B a simple center point since it's a secondary datum, and has to control some rotation right? So I made a symmetry line between one axis of the slot and a symmetry point between the other axis. Seems simple enough but I'm running into problems with the profile callout on the right (calling out datum C). ![]() This week it's a pair of rounded slots used as datums. Until my dream mentor arrives, I'll keep coming to r/metrology with my goofy GD&T questions. Using the datum feature simulator is that no part can have a perfect surface to establish itself as a datum. Examples: gage pin, block, surface of granite block. The datum feature simulator for C would be. Datum Simulator - A datum simulator is a surface of adequate precision oriented to the high points of a designated datum from which the simulated datum is established. It would be my suggestion to use datum simulators for the rough edges such as you stated, parallels, 1-2-3 blocks, squares, anything that would allow you to use the best geometric mating fit of the part and take the measurement lines/points on these artificacts instead of the actual rough surfaces. I keep telling myself my company is going to hire someone competent in GD&T to teach me this stuff but I'm starting to think they don't really care about metrology and just want to sell parts! Can you believe that!? What Is Datum Feature Simulator Datum feature simulator is inspection equipment like the surface plate, gauge surface, which comes in contact with the datum of a part. Datums Are Mutually Perpendicular - Even When the Datum Features Are Not. ![]() It's Calypso boy back again with another head-scratcher. Plnovan datum vydn: Bude oznmeno Nedvn udlosti a oznmen Informace o obsahu Systmov poadavky Dal DLC pro tuto hru SCS Software dal hry. The two datum features called out (B, C) are rounded slots.
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