Glossary · Safe work, maintenance and competence
Center of gravity
Also known as: center of mass, CoG
In machine safety, the center of gravity is the point at which the weight of an object can be considered concentrated for stability and handling calculations. It determines how a machine or part behaves when lifted, tilted or set down.
- Machine safety
- Technical documentation
In one sentence
The center of gravity tells riggers how a machine will hang or tip, so it belongs on transport drawings and in the handling instructions.
Example
A CNC machine delivered on a skid has its center of gravity well off center because of the spindle head; the transport drawing marks it so the forklift forks and slings are placed correctly.
How it applies
- Machine safety: An off-center or high center of gravity can make a load tip or swing when lifted. Transport and installation are life cycle phases that the risk assessment has to cover.
- Technical documentation: Mark the center of gravity on the machine or packaging where it is not obvious, and show it in the transport section of the operating manual together with the mass and the lifting points.
- Integrated systems: The center of gravity changes when tooling, fluids or options are added, or when the machine is split into modules for transport. Give values for each transport configuration.
- Evidence: Keep the calculation or weighing result with the design documentation, so the marked position can be traced to its source.
Center of gravity vs. lifting point
The lifting point is where equipment is attached. The center of gravity decides whether a load hangs level from those points. Both are needed for safe handling.