1. Decide what "fixed" actually means for your shop
Fixed does not mean the lathe comes to the machine. It means the generator, the tank and the water connection stay in one place, and the wand and hose travel to the lathe. So the planning question is how far the crew will walk with the hose, and what the hose has to cross on the way. A unit sited on a mezzanine or behind a partition looks tidy on a layout drawing and is a nuisance in practice, because the crew will take shortcuts with a long hose across an aisle that forklifts use.
The other half of the decision is services. A fixed unit plumbed to a tap supply removes the daily ritual of filling and carrying a tank, which is exactly the step that gets skipped when the crew is short-staffed. Where the shop has no water run to the cleaning point, say so before the machine is specified — that constraint decides the tank size and the siting, and it is cheaper to solve at the design stage than after delivery.
2. Check what the lathe's exterior is actually carrying
Lathe exteriors do not carry one kind of soil. There is cutting fluid or coolant film on the panels, a dry chip dust in the gaps and on the way covers, and near the chuck and tailstock a thicker oil-and-chip paste that has been baked onto warm surfaces over weeks. Those three respond differently. The fluid film lifts easily; the chip dust is mostly a brushing job; the baked paste around the chuck housing is where heat and dwell matter and where a cold hose wash simply pushes it around.
Walk two or three machines and write down the worst surface on each — usually the way cover bellows, the chuck guard inside face, the chip conveyor trough and the panel gap behind the control pendant. That list, not a general "clean the machines" instruction, is what you size the equipment and the method against.
3. Match the machine to the duty, with published numbers
For a fixed installation, the spec that matters is output and endurance, not portability. The PowerDe HW02 fixed steam unit lists a 6 kW heater, a 160°C steam temperature, 0.8 MPa vapour pressure, an 80 L SUS304 tank, a 220 V supply and a tap-water inlet, with a dry-steam and wet-steam mode plus a vacuum function. Those figures translate into practical behaviour on a lathe exterior: enough pressure to move the oil-and-chip paste off a warm housing, and a tank and feed large enough that the crew is not stopping mid-machine.
Mode selection is worth putting on the task sheet rather than leaving to the operator. Dry steam goes onto a baked-on deposit first, because it carries heat without dumping water into a gap or an electrical enclosure; wet steam follows as the rinse once the film has released. On painted panels and near the control pendant, the drier mode is also the safer one, since there is less free water to run into seams. The fixed steam cleaning machine page lists leakage, short-circuit, high-temperature, high-voltage and water-shortage protections — useful on a shop floor, and a reason the crew should be told to report a tripped machine rather than keep resetting it between machines.
4. Site it near the machines with the worst soil
Site the unit against the machine group that produces the heaviest deposit, not in the maintenance store where it looks orderly. A fixed machine three aisles away from the lathes that need it will be used once a month; the same machine at the end of the bay gets used weekly, and weekly is what keeps the residue from becoming a stripping job.
Give the position three things: a floor space that keeps the unit clear of swarf and out of the truck route, a drain or a bunded sump where the run-off can go, and a hose route that never crosses a walkway. If the shop runs coolant on the floor already, plan for the mixture — oily run-off from a steam clean belongs in the site's waste route, not in a rainwater drain.
5. Isolate before the wand goes near a lathe
No cleaning task on a lathe belongs on a schedule without a stated isolation step. That means the machine's isolator switched off and, where the site runs a permit system, locked and tagged; the chuck and turret parked in a safe position; and any stored pressure or axis movement released. Steam into a gap in a control enclosure, a pendant cable gland or the reader head area is a fault waiting to appear weeks later, and it is difficult to trace back to a clean.
Write the protected list per machine model on the task sheet: control pendant and screen, encoder and scale housings, way-cover bellows joints, cable chains, motor fan covers, and any bearing vent. Mark those as wipe-around, not spray. This is the single instruction that decides whether steam cleaning on lathe exteriors is a maintenance win or an expensive lesson.
6. Chip and fluid handling before the steam
Steam onto a thick bed of chips makes wet swarf paste that is harder to clear than dry chips. So the sequence on the sheet starts with brushing and picking out loose chips from the way covers, the chuck guard and the conveyor trough, then the conveyor is emptied, then the steam goes on. It reads as an obvious step and it is the one crews skip when the shift is running late.
Standing coolant in trays, in the conveyor sump and behind splash panels should be drained or squeegeed into the site's waste route before steam, because otherwise the run-off simply multiplies the volume of contaminated liquid the crew then has to deal with.
7. Technique on the exterior surfaces
Work top to bottom and back to front, so anything dislodged falls onto a surface that has not yet been finished. Keep the nozzle at the distance written on the sheet, in short passes with the wand moving; if a deposit on a panel has not lifted after two passes, the answer is dwell, not pressure. A brush head held against an edge, a corner or a panel joint beats a bare nozzle every time, because the bristles keep the heat on the deposit instead of letting it bounce off curved sheet metal.
Way covers and bellows need the lightest touch on the whole machine. Steam them along the length, never across an open fold, and wipe them immediately; trapped water in a bellows fold is how a good clean turns into corrosion. Painted panels want the drier mode and a shorter dwell than bare castings. Where a machine has a manufacturer's warning against water washing, put a copy of that warning on the task sheet beside the affected tasks.
8. Fix the water and drainage question
A fixed machine makes the water question visible, which is a benefit. Record how much water each machine consumes per clean; the figure drives whether the unit stays fixed or whether a mobile unit from the Cleaning Equipment Series suits a shop where one crew services widely separated bays. Steam cleaning uses far less water than a hose wash, and on a shop floor where the floor is already wet from coolant, that difference is what keeps the aisle walkable after the clean.
Name who checks the interceptor or sump and how often it is emptied. Oily run-off from an exterior degrease will silently fill a small sump, and the failure only shows up as a flood during the next clean.
9. Acceptance the operator can check in seconds
"Clean" cannot be enforced on a task sheet. Write checks instead: no visible fluid film on the panels, no loose chips in the way cover folds, chuck guard interior free of paste, no pooled water in a tray or behind the splash panel, floor dry within a metre of the machine, and no coolant smell left on the handwheel the operator touches. Then add one functional check: the machine is powered up, referenced and run through its axes, and the result is signed against the task. That single line catches almost every error made during a steam clean.
10. Look after the machine, including the water in it
A fixed machine that depends on a shop's water supply needs the descaling routine written into the plan with an owner and a date. In a hard-water area scale collects inside the heater and output falls long before the unit fails, and the crew responds by holding the nozzle closer — which is where overspray and water ingress start. Keep seals, nozzles, hoses and brushes on the spares list, and record the service interval next to the machine register rather than in a maintenance binder nobody opens.
11. Trial on two machines before you commit the schedule
Run a short trial on the dirtiest lathe and one average machine, timed, with the numbers recorded: minutes per machine, litres used, and whether the deposits on your list actually lifted. A trial settles the arguments the specification cannot — whether a longer hose or a second unit is needed, whether the crew will follow the sequence, and whether the return-to-service time is short enough to clean during a normal shift rather than at the weekend.
12. Get the configuration matched to the bay
A shop with six CNC lathes in a line, a shop with three manual lathes in a corner and a shop with a single large boring machine each need a different siting and a different hose length. Shenzhen PowerDe Automation Precision Equipment publishes the parameters for each machine in its Cleaning Equipment Series and offers customized cleaning equipment specified against your layout and duty cycle. Send photographs of the worst deposits on your lathes, plus your layout and available services, to the contact page, and ask for a fixed configuration and a method that fit the bay you have.
