Lathe & CNC Machining SWMS

Manual lathe and CNC turning/milling centre operation exposes machinists to rotating chucks, high-velocity swarf ejection, coolant mist inhalation, and crushing/entanglement hazards during workpiece loading and tool changes. This SWMS covers the full operating cycle: chuck-guard interlock verification, jaw torque and face-plate clamping checks, program verification in single-block mode before full-cycle execution, mode selection discipline (auto vs MDI vs manual), and LOTO procedures for tool changes with spindle-stopped confirmation. Under WHS Regulation 2025 Part 3.2, lathes and CNC machining centres are classified as plant with the potential to cause death or serious injury, triggering mandatory risk assessment, isolation procedures, and operator competency verification. A documented SWMS is required before the task commences because rotating-chuck entanglement and swarf-penetration injuries are categorised as high-risk construction work under Schedule 1. PCBUs must consult workers, maintain the SWMS on site, and review it after any incident, plant modification, or program change.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Where geometry permits, substitute manual lathe operations with fully enclosed CNC turning centres that eliminate operator exposure to the rotating work envelope.
2. 2Elimination — Remove the need for manual chip clearing by specifying chip conveyors and programmed coolant flushing cycles between operations.
3. 3Substitution — Replace solvent-based cutting fluids with low-mist synthetic coolants meeting AS/NZS 2243.10 to reduce respiratory sensitiser load.
4. 4Engineering — Verify chuck-guard interlock function each shift; spindle must not start with guard open, per AS 4024.1502 Clause 5.3 safeguarding requirements.
5. 5Engineering — Install and commission local exhaust ventilation capturing coolant mist at the work zone, tested to AS 1668.2 capture velocity benchmarks.
6. 6Engineering — Use single-block dry-run verification with rapid override at 25% before first full-cycle execution of any new or edited CNC program.
7. 7Administrative — Document jaw torque values, face-plate clamp torque, and workpiece projection limits on the job setup sheet, countersigned by operator and supervisor.
8. 8Administrative — Apply LOTO to spindle drive and confirm zero rotation via tactile and visual check before any tool change, gauging, or in-cycle intervention.
9. 9Administrative — Restrict operation to workers holding verified competency in MEM05 turning units; mode-key control held by authorised setter only.
10. 10PPE — Wear AS/NZS 1337.1 medium-impact safety glasses with side shields, snug-fitting overalls (no cuffs/loose sleeves), safety footwear, and remove rings, watches, and gloves before spindle start.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

At a regional precision-engineering workshop, a setter-operator is tasked with turning a 180 mm diameter steel flange on a CNC lathe for a mining gearbox repair. Before spindle start, the supervisor walks the operator through this SWMS at the pre-start brief, working line-by-line through the hazard register. The operator confirms chuck-guard interlock function by attempting a dry start with the guard open — the spindle correctly inhibits. Jaw torque is checked against the setup sheet and countersigned. Because the program was edited overnight to accommodate a revised tool offset, the SWMS triggers the mandatory single-block dry-run control — the operator runs the program at 25% rapid override with the door closed, verifying tool paths against the simulation. Mid-task, the operator notices coolant mist accumulating above the enclosure; the SWMS administrative control requires LEV verification, so work is paused, the maintenance log is checked, and the extraction filter is found to be loaded. The job is held until the filter is replaced and capture velocity reconfirmed. Before the post-op gauging step, the operator applies LOTO to the spindle drive, confirms zero rotation tactilely, and signs the isolation log. The SWMS is left open on the cell terminal throughout the shift, with the sign-on sheet visible to any worker entering the cell, demonstrating live use rather than shelf compliance.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS 2550 — Cranes, hoists and winches; AS 1418 series