EN
EDM Machines
Periodic inspection of EDM machines: dielectric fluid fire, fume extraction, electric shock and insulation safeguards checked by engineers, with signed reports.
EDM machine periodic inspection is the at-least-annual testing by authorised engineers of sinker (die-sinking) and wire EDM machines used in mould and hardened metal machining: the fire-vapour risk of the dielectric fluid, high-voltage leakage, fume extraction and the electrical-safety equipment are examined. In EDM the material is melted by controlled spark discharges between electrode and workpiece; flammable dielectric fluid, its vapour and high voltage coexist.
Critical Safety Organs
- Fire prevention: Flash point of the dielectric; liquid level sensor (discharge cut-off on low level), automatic lid/screen and fire suppression (dry chemical/CO₂) in the machining zone. Special care on mist (spark-on-dry) types.
- Electrical insulation: Generator-system earthing, RCD; blocking access to live parts inside the tank; insulation resistance (TS EN 60204-1).
- Fume extraction: Duct emission flow, filter status; limiting operator exposure (occupational exposure limits).
- Wire/electrode motion: Wire breakage and tension on wire EDM; electrode change connection safety; pinch points on moving axes.
- Interlock-control: Door sensor, discharge-cut-off dialogue, emergency stop; additional circuit on automatic cells and robot feeding (TS EN ISO 13849).
Periodic Tests and Measurements
- Level and cut-off test: Verification that lowering the fluid automatically stops discharge; dry-contact warning test if any.
- Earthing-insulation: Body-earth continuity (milliohm), insulation resistance and RCD function test; MV generator output insulation.
- Fume measurement: Exhaust flow and filter pressure drop; enclosure leak control.
- Fire equipment: Automatic suppression detection-triggering test, extinguisher type-fill, containment-tank tightness.
- Mechanical: Axis brake, wire tensioning, lid hinge-lock; sliding-pinch guarding.
Legislation and Standards
EDM machines are subject to at least annual periodic control under Law No. 6331 and the Work Equipment Regulation. Technical references: die-sinking EDM safety TS EN 13218, electrics TS EN 60204-1, functional safety TS EN ISO 13849, interlocks-guards TS EN ISO 14119/14120, and the exposure limit regulations for chemicals. Fire safety also links to the Regulation on Protection Against Fire in Buildings.
Risks, Recommendations and Outcome
The heaviest EDM incident is ignition of the vapour layer over the fluid by sparks spreading into the dielectric; disabling the level-cut interlock triggers this risk. Poor cable insulation and earthing faults cause electric shock. Facilities are recommended dielectric temperature-level monitoring, periodic filter cleaning, closed-lid operation, suppression function test and extraction capacity verification. At the end of the examination a signed report is issued. EDM controls are in our Machines and Machine Tools group; see CNC Machining Centres and Grinding, or contact us for an appointment.
FAQ on EDM Machine Inspection
EDM machines remove material through controlled spark discharge between the workpiece and the electrode; wire EDM adds a moving electrode wire and dielectric fluid. The leading risks fall into four groups: electric shock from contact inside the tank, dielectric fire when vapour meets a spark, wire breakage and jamming at the spool, and splash while the lid is open. Control runs around the door lock, the level-temperature alarm cut chain, insulation and earthing measurement and fire precautions.
The cabin door interlock is verified (no discharge with the lid open) and the emergency stop chain is trialled. Insulation resistance, earth-bonding continuity and RCD function of the discharge generator are measured. In the dielectric tank the level and temperature sensors are tested through alarm and cut, and the filter-pump circulation is checked for clogging. On wire machines the tension sensor, wire break stop, spool and guide wear are audited. Vapour extraction performance, panel thermal scan, CE documentation, the manual and the waste dielectric file close the inspection.
A faulty lid interlock (discharge continues while open), a dead emergency stop, a bypassed tank level-temperature alarm (fire risk), failed insulation, earthing or RCD, a bypassed wire tension-break sensor, a clogged filter above pressure limit or dead vapour extraction: the machine is red-tagged out of service. Return happens after repair with alarm and lock function trials; dielectric change and wire threading are left to trained staff under written procedure.
Engineer examination runs yearly under the Work Equipment Regulation, while the manufacturer calendar (filter change, dielectric quality check, wire guide performance) feeds interim checks. Daily watch of lid, alarm, level and ventilation belongs to the operator. For fire precaution the tank area is kept free of combustible waste, a suitable non-water extinguisher stays accessible and drills are planned. Reports, alarm test logs, the waste dielectric permit and training certificates live in the OHS file and are presented in insurance and regulatory audits.