A steam-cleaning trial on a CNC machine answers one question only: can this shop repeat the result on its own soil, in its own shutdown window, without harming the machine. Before a supplier books a demo, the machine builder or buyer should send the same short list of facts every time. The list below is the set PowerDe asks for when a cleaning trial is discussed for machine tool steam cleaning work; it is also what a factory should be able to answer internally before any quotation is compared.
Name the surface, not the machine
A CNC machine is not one surface. Cast-ways with a lubricating film, painted sheet-metal guarding, an enclosure with gaskets and windows, coolant hoses and cable chains, the work envelope after a wet run, and the chip conveyor all behave differently, and each one decides a different method. Send a surface list with one photograph per area, taken from a fixed angle, and mark which areas are touched in a normal cycle and which are only reachable during a planned teardown. A single photograph of the whole enclosure tells a supplier almost nothing useful, and any answer built on it will not survive the trial.
Describe the soil in three states
Cutting fluid on a machine is rarely one thing. A wet film that still moves under a cloth, an emulsified residue that has dried into a tacky skin, and a baked or polymerised film that has been through hot cycles are three different soils, and they respond to heat, dwell time and mechanical action in different ways. Say which state is present in each area, and send a sample panel of the same material deliberately soiled on the shop floor and, where relevant, run through the same heat history. Trials arranged against the wrong soil state produce a result that cannot be repeated on the real machine.
Write the no-spray list before the trial, not after
Every trial needs a written list of components that must not be sprayed, signed by the person who maintains the machine: control cabinets and terminal boxes, drives, encoders and scale housings, cable chains and connectors, linear guides that carry a lubricating film, bonded insulation, vents and breathers, and any sensor exposed inside the envelope. The list should also record the isolation condition, meaning power off and locked out, and the surface temperature the machine is allowed to be at when work starts. A supplier who is not given this list will work to a general method, and the result on protected components is discovered too late.
State what the parameters mean at the point of use
Ask the supplier to state the temperature and pressure at the nozzle tip, which mode the number belongs to, and how dry steam, wet steam and hot-water mode differ in the water they leave behind. For a concrete example, the product page for the PowerDe HW02 steam cleaner lists 160 degrees C and 0.8 MPa, a 6 kW heating element, a 220 V working voltage and an 80 L SUS304 tank, and it uses dry and wet steam modes. Those published numbers describe the machine and its installation conditions; they are not a promise that any particular surface will clean, and they should be treated as the questions a trial has to answer on your own soil.
Give the water, drainage and power facts for that bay
The site conditions decide whether a trial is possible at all. Confirm a protected 220 V outlet at the position where work will happen, not somewhere in the building, and how the cable will run without crossing an aisle. Confirm where the machine will be refilled: the HW02 page lists a tap-water inlet with a 1/2 inch 4-point internal-tooth fitting, so a compatible supply and, in hard-water areas, a plan for scale are part of the setup. Confirm where the run-off goes and who owns the oily water, since machine-tool run-off should not reach a rain drain, and confirm the door width, threshold and floor slope that the machine must pass. Hard water left untreated shows up later as scale inside the machine rather than as a cleaning complaint, so name the descaling owner before the trial.
Define the pass criteria in writing before anyone sprays
Write the decision rule first. A wipe test with a clean white cloth on a chosen panel, a comparison photograph at the same angle showing no film, no blistering or color change on painted surfaces, a seals and connectors recheck showing no water ingress, and a floor dry enough to walk on inside an agreed time are all checkable. Name who signs the result, and name the conditions that fail the trial automatically. Then record what was actually used: mode, nozzle, distance from the surface, travel speed, number of passes, dwell time, dilution ratio if a chemistry was used, and the time spent on each area. Those records are the basis for comparing two suppliers on the same work instead of comparing a demonstration.
Run the trial in a real window and measure that window
A trial performed on a disassembled spare machine in an open bay proves less than a trial performed on a production machine inside the shutdown window that actually exists. Time the whole sequence from lockout to handback, including masking, movement of the machine, drying and the recheck, not only the time the wand is moving. Compare that figure against your current method for the same task; the honest baseline is your own labour and water record, not a catalogue claim. If the trial passes, freeze the parameters into a one-page work instruction that travels with the work order, and add the cleaning machine itself to preventive maintenance with inlet-filter checks and descaling.
Say plainly where steam is not the answer
Areas that cannot tolerate water, areas where run-off cannot be collected, and soil loaded with abrasive swarf are cases where a steam trial is the wrong first step; moving abrasive across a guiding surface is a wear problem, not a cleaning win. If the surface list, the isolation condition or the drainage answer cannot be filled in, the next step is a site survey and a quotation against the facts rather than a purchase of a catalogue unit. Send the surface list, the soil photographs, the timing record of the current method, the power and water facts for the position and the drainage route, and PowerDe can customize a steam cleaning machine to that bay. To arrange a trial on your own machine, contact PowerDe.
