Material estimation
Why calculated mass differs from measured mass
Use a tolerance range when purchasing from nominal dimensions; use measured geometry when investigating a particular piece.
From an input to an engineering decision
Engineering Guides
Practical explanations of the assumptions that change a calculation. Each guide pairs an original technical drawing with a worked example, checked results, and source references.
Beam mechanics
Choose the correct bending axis and second moment of area
Choose I about the axis of the bending moment. The depth perpendicular to that axis is the dimension cubed in bh³/12.
Internal flow
How operating temperature changes Reynolds number
Temperature enters Reynolds number through the fluid properties. Use a matching density/viscosity pair for the operating state.