Gdt Tolerance Zones: datum_feature_simulator
GD&T tolerance zone data per ASME Y14.5-2018 and ISO 286-1:2010 — covering IT tolerance grades (IT1-IT14) with tabulated values in micrometers for nominal sizes 0-500mm; position tolerance at MMC using floating fastener formula T=H-F and fixed fastener formula T=(H-F)/2 for M3-M12 bolts per ISO 273 clearance holes; MMC bonus tolerance examples; datum feature simulators (RFS/RMB, MMB, LMB) per ASME Y14.5-2018 Section 7.11; profile tolerance zone types (bilateral, unilateral outside/inside, unequally disposed); geometric tolerance zone shapes (cylindrical, total width, spherical); and typical IT grades achievable by manufacturing process (lapping, grinding, turning, milling, drilling, casting).
| tolerance type | record id | datum simulator type | description | notes | process category |
|---|---|---|---|---|---|
| datum_feature_simulator | dfs_lmb_hole_c | LMB | Datum feature simulator at LMB hole | At LMB (Least Material Boundary): simulator fixed at LMC/LMB size; datum shift = (LMB - actual size) for internal feature; used for minimum wall conditions | datum_simulation |
| datum_feature_simulator | dfs_rfs_pin_a | RFS | Datum feature simulator RFS pin | At RFS (Regardless of Feature Size): datum feature simulator is minimum circumscribed cylinder for pin; no bonus shift; actual mating envelope | datum_simulation |
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