Installing and commissioning a CNC machine: the complete guide

Installer et mettre en service une machine CNC — installing and commissioning a CNC machine — is a critical phase that directly influences the accuracy, reliability and service life of the equipment. Thorough preparation, from assessing the floor slab to running acceptance tests, prevents costly downtime and regulatory non-conformances. This guide follows the logical sequence of an industrial installation, from receiving the concrete floor report to performing the first machine home reference cycle.

Preparing the installation area before delivery

Site preparation is frequently underestimated. It must be completed before the delivery truck reaches the shop floor.

Floor load capacity and flatness

Floor load capacity is the first parameter to check. A mid-range machine tool can weigh anywhere from 3 to 15 tons depending on its category — a vertical machining center, for example, exerts far greater floor loads than a conventional milling machine. A structural engineer must confirm that the floor's load-bearing capacity (expressed in kN/m²) is adequate for the machine's actual footprint. Floor flatness is equally important: a deviation of just a few millimeters across the slab can introduce mechanical stress into the machine base and progressively degrade positioning accuracy.

Ceiling clearance and lateral access

The layout drawing supplied by the manufacturer specifies not only the overall height of the machine, but also the clearance required during maintenance operations such as spindle replacement or tool magazine access. Allow a safety clearance of at least one meter on operator-access faces and in front of electrical cabinet doors, in line with Machinery Directive requirements.

Chip and coolant evacuation

A trench drain network or coolant collection point must be in place before the machine arrives. Chip evacuation — whether by screw conveyor, magnetic belt conveyor or settling tank — must be integrated into the layout plan, as it directly affects accessibility around the machine.

Available electrical supply

Check the available electrical capacity at the main distribution panel ahead of delivery. Three-phase 400 V supply is standard for virtually all CNC machine tools in Europe. Cable cross-sections, the main circuit breaker rating and the quality of the equipotential bonding must all be sized before delivery.

Unpacking, handling and positioning the machine

Inspection on delivery

Upon receipt, carry out a thorough visual inspection before signing the delivery note. Record any visible damage — impacts on the machine base, deformed guards, torn cables — as written reservations on the carrier's documentation. The manufacturer or their representative must be notified immediately if concealed damage is found during unpacking.

Handling and lifting points

Machine tools have designated lifting points shown on the drawings and marked on the machine itself. Use only these points with slings or lifting bars of adequate capacity. Never lift by the axes, guideways or protective covers. For 5-axis machining centers with complex geometry, the manufacturer typically specifies a sequence for removing transport components such as axis clamps and travel locks.

Positioning on anti-vibration mounts

Final positioning is carried out on adjustable leveling mounts or anchor bolts, in accordance with the manufacturer's recommendations. Leveling is performed using a precision level of Grade I accuracy (minimum resolution 0.02 mm/m), checking flatness in at least two perpendicular directions across the table or bed. This adjustment has a direct bearing on axis geometry and machining repeatability.

Electrical, pneumatic and hydraulic connections

Machine electrical equipment: the applicable standard

All electrical connections must be made in accordance with IEC 60204-1 (Safety of machinery — Electrical equipment of industrial machines). This standard defines requirements for protective earthing, cabinet wiring, emergency stop categories and insulation resistance. A qualified electrician must carry out or supervise these operations.

Three-phase supply and earthing

The three-phase supply is connected to the main isolator in the electrical cabinet. Check phase sequence before energizing: on many CNC controllers, a phase reversal triggers an immediate fault and may damage the drives. Machine earthing must be provided by a low-impedance equipotential bond, separate from the supply neutral.

Pneumatic circuit

Connecting to the compressed air network requires a conditioning unit (filter-regulator-lubricator) installed upstream of the machine inlet, unless the machine has its own integrated module. Supply pressure and nominal flow rate are specified in the technical documentation. An undersized pneumatic circuit will affect tool changer operation, pneumatic clamping and spindle purge functions.

Hydraulic circuit

On machines fitted with an integrated hydraulic power unit — such as tailstock control on CNC lathes, axis clamping or pallet clamping — check the hydraulic oil level before first power-on. Some manufacturers ship the power unit dry for transport; starting without oil would immediately destroy the pump.

Initial CNC controller configuration

Loading machine parameters

Machine parameter configuration encompasses all the data that defines machine geometry, travel limits, servo gains and cycle macros. These parameters are supplied by the manufacturer on a digital medium and must be loaded into the CNC controller before any axis movement is attempted. Overwriting or inadvertently altering these parameters is one of the most common causes of malfunction during initial commissioning.

Axis configuration and travel limits

Verify the direction of travel for each axis, confirm that software travel limits are consistent with the machine's physical limits, and check that hardware limit switches function correctly. These checks should be performed axis by axis at low speed.

Peripheral device configuration

The automatic tool changer, pallet system (if fitted), tool length measurement and in-spindle probing cycles are peripheral devices whose configuration is independent of the axis parameter set. Their setup typically requires a dedicated test cycle provided by the manufacturer.

Start-up procedure and preliminary checks

First power-on sequence

First power-on follows a defined sequence:

1. Close the main isolator in the electrical cabinet.
2. Confirm that no blocking alarms are present on the controller panel.
3. Start the hydraulic power unit (if applicable) and verify that system pressure builds correctly.
4. Release the emergency stop and enable drive power.
5. Carry out a visual and auditory check for abnormalities: leaks, unusual noises, smoke.

Warm-up cycles

Manufacturers consistently specify spindle and axis warm-up cycles before any productive use. These cycles — typically progressive spindle speed ramp-ups over 20 to 40 minutes — allow lubricants to distribute fully, thermal expansion to stabilize and mechanical components to reach their rated operating conditions. Skipping this step at commissioning, and after any extended stoppage, accelerates premature spindle bearing wear and degrades geometric accuracy.

Validation testing and machine reference homing

Machine reference homing

The machine home reference cycle is the procedure by which the CNC controller positions each axis at its absolute reference point, detected by a position sensor — inductive sensor, linear scale or resolver. This operation is mandatory after every power-on on machines equipped with incremental encoders. On machines with absolute encoders it may be optional, but is still recommended to verify measurement system consistency.

Geometric and mechanical tests

Acceptance tests verify that the machine meets its specification: axis squareness, table flatness, positioning accuracy and repeatability. Measurements are taken with metrology instruments — precision straightedges, precision spherical standards, ball bars — following the protocols defined in ISO 10791 (machining centers) or ISO 13041 (turning machines). Results are recorded in an acceptance report, which serves as a baseline reference for preventive maintenance tracking.

Functional test cycles

Before first production, run the test programs supplied by the manufacturer: a complete tool change cycle, clamping cycle verification and tool length probing test. These cycles detect any residual configuration errors in a controlled environment.

Safety, compliance and operator training

CE marking and declaration of conformity

Every machine tool placed on the European market must be accompanied by a CE declaration of conformity and bear the CE marking. The purchaser must confirm that these documents are supplied with the machine. When a machine is integrated into a line — combined with a robot, conveyor or external clamping system — an additional risk assessment under the Machinery Directive may be required, resulting in a new declaration of conformity for the complete installation.

Compliance certificate and technical file

The compliance certificate and technical file — including the operator's manual in the local language, electrical schematics and maintenance drawings — must be archived. These documents may be required by labor inspectors and are essential in the event of a workplace accident involving the machine.

Mandatory operator training

Employers are required to ensure that operators have received appropriate training before using work equipment. This training must cover the specific hazards of the machine — chip projection, crush risk during tool changes, electrical hazards when accessing the cabinet — as well as emergency stop procedures and first-level maintenance instructions. Formalizing this training with a signed internal authorization record is strongly recommended.

Preventive maintenance from day one

Commissioning is the right time to initialize the preventive maintenance plan: record baseline reference values (oil levels, hydraulic and pneumatic pressures, operating temperatures), configure hour counters in the CNC controller for maintenance alerts, and schedule the first service intervals — hydraulic power unit oil change, automatic lubrication gauge inspection. This discipline from the outset determines long-term machine availability.

Regardless of the machine category — CNC lathes, vertical machining centers or 5-axis machining centers — the thoroughness applied when installing and commissioning a CNC machine determines its accuracy and uptime throughout its productive life. A methodical installation is also the strongest foundation for an effective preventive maintenance program.