Tolerance Stack-Up on Multi-Port Manifolds Before You Freeze the Drawing

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A manifold drawing often shows each branch dimension as an independent tolerance. In fabrication the deviations accumulate, and the last port ends up out of position relative to the rack or CDU interface. The fix is to agree datum surfaces and a stack-up rule before the drawing is released.

We review port pitch, projection, face orientation and the datum scheme together, then state the inspection method that will be used to verify the finished assembly. Dimensional repeatability matters most when a skid may be replicated or replaced later.

Key Points

• Agree datums and a cumulative tolerance rule, not only per-feature limits.
• Check the mating interface envelope, not just the manifold itself.
• Define how the finished part will be measured and recorded.