What questions help compare cleaning equipment for tooling and workholding equipment?

A purchasing engineer comparing a steam cleaning machine with a pressure washer, a solvent bath, or an outsourced cleaning service is not comparing machines. They are comparing two cleaning processes applied to the same parts. That is why vendor questions about industrial steam cleaning equipment should be grouped by decision, not collected as a general spec list. The five groups below map each question to the evidence you should ask for in writing, so a quotation can be compared line by line instead of on price alone.

1. Scope questions: what actually has to come clean

Before any machine is discussed, write down the cleaning task in the form a supplier can test against. Record the fixture families (dies, moulds, jigs, clamps, vises, chucks, tool holders), the residue type (oil film, cutting fluid, graphite, release agent, baked-on grease, swarf), the substrate and coating, the dimensional and surface finish tolerance, and the required turnaround.

Ask the supplier two direct questions: which residues can their process be demonstrated on, and what do they need from you to run that demonstration. A supplier who answers with a written sample-test procedure is describing a process. A supplier who answers only with a brochure is describing a machine.

Two scope details change the machine class, so settle them early. Whether the parts stay on the machine bed or are removed to a cleaning bay decides between an in-place cleaning method and a standalone high-pressure steam cleaning machine. Whether the cleaning station has a fixed 220 V supply or must work where power is limited decides between a fixed unit and a battery-powered mobile unit.

2. Process-capability questions: can it remove this residue

Ask for steam temperature and steam pressure, and for the dry-steam and wet-steam modes, stated with the test conditions. On the fixed PowerDe HW02 steam cleaner the product page lists 160° steam temperature, 0.8 MPa vapour pressure and 6 kW heating power. Those numbers describe the machine, not your result. What you still have to ask for is the nozzle type, the standoff distance, the pass speed and the dwell time that produced a clean part in their sample test.

Then ask what the process cannot remove. Grease that has been baked onto a hot die behaves differently from fresh cutting fluid on a chuck, and a supplier who will not name their limits is not telling you how your worst case will be handled. Ask whether stubborn deposits need a mechanical step, a soak, or a repeat pass, and who performs that step.

Ask whether the machine is offered in fixed and mobile forms, and what limits each form. On the HW02, the product page records 220 V working voltage and an 80 L SUS304 tank. Whether that tank size fits your daily part count depends on your shop's shift pattern, so ask the supplier to state the intended duty cycle rather than assuming it.

3. Asset-protection and safety questions

Steam and pressure carry risks to the very assets you are protecting. Ask which machine parts, seals, bearings, guides, electrical connections and sensors must not be sprayed directly, and what the supplier's written procedure says about masking or covering them. Ask how bearings are protected from water ingress and how the assembly is dried afterwards, because trapped moisture drives flash rust.

Ask what the supplier recommends after cleaning: which flash-prevention oil or protective coating, and whether it can be applied while the part is still warm. Cleaning that leaves a bare, wet metal surface can cost more in rust scrap than it saves in labour.

For operator safety, ask for the protection functions in the supplier's own wording and list the items rather than a headline count. The HW02 page records leakage, short-circuit, high-temperature, high-voltage, water-shortage and high-voltage-explosion protection. Also ask what personal protective equipment is required, where hot condensate is discharged, and how the machine behaves on an epoxy-coated shop floor that must stay slip-free.

4. Throughput, water and utility questions

Throughput decides whether the process is usable. Ask for heat-up time from cold, the recovery time between stations, and the working power supply. A 220 V fixed unit needs a suitable supply and a water inlet; the HW02 product page records a tap-water inlet with a 4-point internal-tooth joint and 1/2 inch connection. Confirm that your plant can meet those utility requirements before the machine arrives.

Ask how condensate is collected and treated. A shop cleaning machine beds and fixtures should not turn oil-laden runoff into a floor drainage problem, and the answer affects what you install around the station.

Ask what the water supply requires: hardness limits, filtration, and who services the tank and heating element. Scale in a heater is a maintenance cost, and you want it named in the warranty terms at quotation stage. Where a fixed station is not practical, battery-powered mobile units are listed with dry-steam, wet-steam and hot-water modes; confirm duty cycle, runtime and charging arrangements before comparing them against a fixed machine.

5. Proof, commercial and service questions

Ask for the acceptance test in writing. Agree the parts, residues and inspection criteria, and require the supplier to demonstrate cleaning on your own samples before you commit. For an in-house machine tool steam cleaning duty, that trial is also how you test your operator instructions on the real parts, including which fixtures must be disassembled before cleaning.

Then make the quotations comparable: delivered price, spare nozzles and hoses, wear parts with their replacement interval, warranty scope and what voids it, service response and engineer lead time, training for your team, and lead time to commissioning. Ask which consumables your site must stock, and ask for that list in writing so it goes into your total cost of ownership.

Finally ask how your second and third lines get the same setup, and whether the supplier documents processes rather than selling machines only. Where the cleaning duty is specific to your fixtures, an equipment partner that develops and tests customised configurations may matter more than the catalogue specification.

A three-column way to compare answers

Score each supplier's answer on three columns: written evidence, test result, and responsibility. "We have sold 200 units" is not evidence. "160° steam at 0.8 MPa, with a sample trial on your clamps against graphite and oil film, and the machine adjusted to the agreed result" is.

Work through these five groups with two or three suppliers and the differences become visible before you sign. If you want a trial on your own tooling, start by sending the fixture families, the residue you are fighting and the turnaround you need.