A correct program needs a correct setup

The program, installed tool and actual workpiece position must agree. Changing a fixture, offset or datum can alter a previously valid trajectory. Checks should cover clearances and automatic tool changes using the trial method specified for that machine.

Workholding must withstand process forces without damaging the part or interfering with movement. Tools and holders must suit the operation and their operating limits. An uncertain setup cannot be made acceptable by assuming the enclosure will contain every possible failure or ejected fragment.

Enclosures and access

Machine guards and Interlocking devices prevent access to hazardous motion during a cycle. Their condition, attachment and operation belong in equipment checks. Maintaining visibility and cleanliness helps prevent situations that encourage operators to defeat them.

Also assess pallet changers, tool magazines and chip conveyors. A secondary access point can expose someone to automatic movement even when the front of the machine is well guarded. Include people carrying out support tasks, not only the operator at the control panel.

Setup, cleaning and faults

Setup tasks require the operating mode and conditions authorised by the manufacturer. Pausing a program does not make the installation ready for someone to enter or reach inside.

For clearing jams, repairs or interventions where energy could be released, apply the relevant Lockout/Tagout (LOTO) procedure. Chips can be hot and sharp. Their removal needs suitable tools and a method that avoids placing hands where movement is possible. Define which tasks are operator duties and which require specialist service personnel.

What the assessment should record

Identify routine parts and materials, changeovers, training, access tasks and auxiliary equipment. Keep the checks for each setup understandable to the people who perform them; repeated production should not conceal changes in tooling or workholding.

Include cutting fluids, mist and the need for Ventilation and local exhaust ventilation, as well as noise and spills. For example, introducing a different material or fluid requires review of its safety information and process compatibility. Retaining the same CNC program does not automatically preserve all the previous preventive conditions.