GD&T Tutorial : Virtual Condition - This video explains about various boundary conditions like Worst Case Boundary, Inner Boundary, Outer Boundary, Virtual Condition in Geometric Dimensioning and Tolerancing (GD&T)
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Worst Case Boundary is a general term used to refer to an inner boundary, outer boundary or virtual condition
For an internal FOS, inner boundary is the smallest FOS (MMC) minus the effect of applicable geometric tolerance and any additional tolerance that may apply
For an external FOS, inner boundary is the smallest FOS (LMC) minus the effect of applicable geometric tolerance and any additional tolerance that may apply
For an internal FOS, outer boundary is the largest FOS (LMC) plus the effect of applicable geometric tolerance and any additional tolerance that may apply
For an external FOS, outer boundary is the largest FOS (MMC) plus the effect of applicable geometric tolerance and any additional tolerance that may apply
Virtual Condition is a fixed size boundary generated by the collective effects of a considered FOS specified MMC or LMC and the geometric tolerance for that material condition
For IMMC : VC = IB = MMC - GTV
For ILMC : VC = OB = LMC + GTV
For IRFS : IB = MMC - GTV
For EMMC : VC = OB = MMC + GTV
For ELMC : VC = IB = LMC - GTV
For ERFS : OB = MMC + GTV
VC - Virtual Condition
RC - Resultant Condition
IB - Inner Boundary
OB - Outer Boundary
BT - Bonus Tolerance
GTV - Geometric Tol. Value
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