Mechanical, Electrical & Control Design Package

Detailed design is a set of coordinated views, not one master CAD model.

Mechanical package

Provide layout, load path, kinematic skeleton, FBDs, mechanism and transmission selection, torque/force/speed calculations, shaft/bearing/member checks, deflection and vibration screen, material/process choices, datum/tolerance scheme, assembly sequence, guarding interfaces, maintenance access, and bill of materials.

Electrical package

Provide power budget, one-line architecture, voltage domains, protection and disconnect concept, I/O list, schematics, network, connectors, wire/terminal references, grounding/shield strategy, cabinet heat estimate, device settings, and interface contracts. Real industrial design requires qualified review and applicable codes.

Control package

Provide operating modes, state machine, sequence narrative, permissives, interlocks, alarm philosophy, timing budget, motion profiles, feedback model, controller design, parameter list, loss-of-communications behavior, restart, recovery, and configuration management. IEC 61131-3 offers standardized language forms; choose the form that makes the behavior clearest ¹.

Calculation standard

Every calculation shows purpose, diagram, load case, assumptions, equation, units, parameter source, result, margin, limitations, and planned verification. Use consistent sign and reference frames.

Interface review

Walk every boundary. Does mechanical hard stop match control travel? Does sensor resolution fit the tolerance budget? Does stopping distance fit safeguard location? Does lost power leave gravity controlled? Can maintenance isolate every energy source and reach the wear part?

Gate 3

Pass when critical requirements trace to design features and calculations; interfaces have named owners; drawings agree; high-risk parts have test plans; and no safety-critical conclusion depends on an undocumented assumption.