Start with the machine population, not the cleaning method
A lathe is not one object. A shop may hold a slide engine lathe, a flat-bed CNC turning centre, a turning centre with a tool changer, a vertical turret lathe, a wheel lathe or a twin-spindle machine, and each changes the cleaning plan. Record for every machine you intend to clean: the machine type and maker, the year and whether the paint has been repainted, the footprint including chips and coolant splatter around the base, whether the enclosure is a full panel with glass or open guarding, and whether the drive is belt, direct or geared. Then record what sits on and under it: coolant tank, chip conveyor, swarf bin, hydraulic unit, work light, foot switch, air blow line, and any fixture, stock or gauge an operator keeps on the way cover.
This population list is the first field of the assessment, because a cleaning method is chosen per machine family and then per surface line, never per shop. A single line on that list that cannot be cleaned safely is enough to change the scope of a whole contract, so it should be found on paper before the walk, not discovered by an operator with a lance in hand.
Name the deposit on every surface line
The second field is the dirt, described precisely enough that a supplier cannot answer with a brochure. On a lathe the deposits are distinct and behave differently under heat and water: neat cutting-oil or neat-neat rolling film; a swarf-bound paste where chips mat against the enclosure; way oil migrating from the slideways; hydraulic bleed from a fitting or a cracked hose; an airborne mist film that coats the top of the cabinet and the roof of the enclosure; dried coolant paste on the floor side of the way cover; and grinding or dressing dust mixed with oil in a machine that shares the air with a grinder. Note the age of each deposit, whether it has been baked on by machine warmth or rebuilt cycle after cycle, and whether the machine has been steam-cleaned or painted before.
Deposit typing matters more here than on a vehicle. Heat and dwell do most of the work on an aged oil film, while water volume is a cost and a risk rather than a cleaning agent, so the deposit description is what drives the mode choice on each line of the surface list. Where the deposit cannot be named confidently, the assessment should say so and put that line in the trial rather than in the plan.
Draw the exclusion boundary from machine geometry, not machine quality
The most important section of a site assessment for cleaning lathe exteriors is the list of places a wand must not reach. That boundary is set by the machine's geometry and its sealing, not by whether the machine is expensive or old, and it must be written per model, with an alternative method named beside every excluded line.
For a lathe the list normally covers: way covers and the slideways themselves; wiper seals and the ends of them; the ball screw and its guard; the tool changer arm, its pockets and its magazine; spindle nose, spindle bore, chuck jaws, the chuck interior and the drawbar area; the tailstock quill and its clamp; the tool post and its clamping screws; encoder, linear scale and glass ruler fittings; sensor, limit switch and probe connectors; terminal boxes, cable glands and the cable chain; cabinet fan filters, vents and door gaskets; the coolant tank filler, lid seal and sight glass; the hydraulic reservoir filler neck and breather; servo and spindle ventilation plugs; pneumatic fittings and the air line quick release; the work light, its mounting and its socket; nameplates, safety labels, interlock decals and touch-screen film; panels that the shop or a previous contractor has sprayed over, and adhesive decals or stencilled machine numbers, which a shop may have touched up after a crash.
Beside each line, write the fallback: hand wiping with a solvent-free cleaner the site already approves, a dry brush and vacuum cloth, a low-pressure wipe-down with a damp cloth, or leaving the line alone until maintenance inspects it. An assessment that only lists exclusions has not finished its job; one that lists exclusions with alternatives can be handed to an operator.
Keep the interior of the machine in a separate scope
Decide and record, before the quotation, that this work is external. The interior of a lathe, guideways and their lubricant film, the way-cover tracks, the chip conveyor, the coolant sump, the spindle taper and the tool changer grippers stay with maintenance, and the assessment should state that plainly. Directing a wand at an open track or an open way cover strips slideway lubricant and carries swarf into the guides, which is a machine-tool failure rather than a cleaning defect, and it is the single most expensive misunderstanding this kind of project can have. Where the shop wants the interior addressed, that is a different scope, with a maintenance procedure, lubricant replenishment and a machine test after reassembly, and it must not be bundled into an exterior cleaning line on a purchase order.
Map reach and access before anyone talks about a machine
Lathe exteriors are hard to reach rather than hard to describe. The assessment should record, for each machine, which faces are actually reachable: the front panel with the door open or the door removed, the top of the enclosure where the mist film collects, the rear service side and the gap between adjacent machines, the underside of the way covers, the base casting and the plinth, the coolant tank lid and its surround, the chip conveyor discharge, and the floor around the machine. Note the working height, whether the shop has a platform or steps and who is allowed to use them, whether a person can stand square to the surface or has to reach over a chuck, and whether lighting is adequate on the shadowed side.
Reach and dwell, not the machine specification, cap the area one operator can do in a shift. Mark stand positions on the shop layout, record the distance from the machine to the point where the unit has to sit, and count the walks to refill and to drain. Those numbers become the per-machine time estimate, and they are far more reliable than a supplier's rate for a vehicle.
Record the utilities at the machine, including the ones nobody owns
A fixed unit has to be fed. The assessment should list, at each position: the socket or the supply point and who confirms the circuit, breaker and cable route; the water source, whether it is tap water, and who supplies the hose from the wall to the machine; the drain, gully or floor channel nearest the position and whether it runs to the shop's foul system, to a surface channel or to an interceptor; the length of delivery line the unit would need to reach the far side of the machine; and whether the unit must be moved between machines and by whom. Also record what the shop already supplies and what nobody has yet agreed to own, because the items nobody owns are the ones that appear as extras on the second quotation.
Where the shop would rather move a mobile unit between lathes, the assessment should note that this supplier's mobile range is positioned on its own pages for indoor garage bays and tight outdoor parking, that is, for vehicle work, and that a machine shop has to test that positioning against its own layout rather than inherit it. Fixed or mobile is settled on the shop drawing by reach, services and handling, and the drawing should be attached to the enquiry.
Treat run-off as a decision the site signs, not an afterthought
A run-off plan belongs inside the site assessment for cleaning lathe exteriors, because where the water may go is what usually ends these projects in a machine shop. The plan should name, per machine: the route the water takes from the surface to the drain; who signs that route; whether swarf and separated oil are skimmed or screened as a schedule item with a named owner; where the collected solids go and who removes them; how the floor is kept non-slip while it is wet and who closes the area; whether the machine base, the conveyor and the floor channel can be contained during the pass; and how each wet line is closed with a dry condition, including the way production is handed the floor back at that machine.
Ask the supplier for their own hourly water figure at the point of use, and ask where it was measured. Never infer an hourly rate from a tank volume, which is a holding capacity and says nothing about consumption, and never infer a working duration from a tank or a battery row either. Interceptor emptying, gully cleaning and disposal of the separated oil are cost lines, and they belong in the quotation the assessment eventually supports.
Put the isolation state and the shutdown window on the sheet
Record what "cleaning state" means for this shop, in the order the shop will actually work: machine stopped, controls off, energy sources isolated and locked, coolant pumps off, the lubricant still inside the slideways and gears where it belongs, chips removed from the accessible exterior, stock and fixtures cleared off the machine, guards and doors in the state the cleaning crew is allowed to leave them, and a named person holding the key or the lock. Then record the window during which the machine is off the production schedule and who may open the work area.
A site assessment that leaves the isolation state vague produces two failures: a crew that waits for a shutdown that never comes, or a crew that cleans a machine nobody isolated. Write the shutdown window and the isolation rule per machine family, and put the restore steps and the hand-back check at the end of the same line.
Take test patches and photographs before the quotation
The assessment should end with a small, bounded trial on the shop's own worst surfaces rather than a large first order. Tape a defined patch on two or three surfaces per machine family, for example a lower panel, a way-cover face and the plinth, and photograph each patch before and after the pass. Those photographs become the acceptance baseline, and the patch is the only honest evidence in the file, because no supplier quotation describes your deposit.
Write the acceptance standard and the stop conditions before the first pass, in the same document. The acceptance standard says what a clean surface looks like and what close inspection requires; the stop conditions say what ends the pass immediately, such as any moisture at a connector, a gland, a scale fitting or a cabinet vent, any lifting of a decal or of repainted panel edges, any change in the machine's behaviour at restore, or any run-off reaching a route nobody signed. One row per patch, one result per row, and the person judging the result separate from the person holding the lance. Run the trial twice, then convert the outcome into a one-page standard per machine family, trained in place, with a review date on it.
Ask for the specification as rows, not as a headline
Supplier specification sheets are not comparable across vendors, and notation on them is not always consistent, so the assessment should carry the specification as a list of rows, each one answered in writing against the actual machine you are being quoted, in the shop's own units, rather than as a headline claim. The rows to ask for: the mode set the unit offers and what each mode is for; steam temperature and delivery pressure together with the measurement point, since temperature at a generator and temperature at a nozzle are not the same figure; heating power; the water supply requirement and the inlet fitting; tank or holding volume, declared as a holding capacity and not as working time; hourly water use at a named mode; delivery line length, lance length and the standard accessory set; the supply arrangements the site must provide; and the electrical protection arrangements, requested feature by feature rather than as a single summary line that counts them up.
If the model designation carries a voltage inside the model name, ask for the working voltage on its own row so it is not read twice or missed. And when a page for one unit is quoted, ask for the model designation to be restated once, in one form, on the quotation: pages in a catalogue change, and the machine you test is not necessarily the machine you buy. For the fixed unit on this supplier's site, that row-by-row request is the safe way to read it: the page Fixed Steam Cleaning Machine PowerDe HW02 publishes the specifications of one specific fixed model, and its application wording on that page names vehicle exterior work at filling forecourts and parking areas, interior work on vehicles and engine-compartment work. Nothing on it names a lathe, so the page is evidence about a machine, not about your duty, and a lathe scope has to be proven by your own trial.
What the site already says it provides, and what it does not settle
The supplier presents itself as a maker of intelligent PowerDe cleaning equipment alongside semiconductor, thin-film and automation equipment, and its cleaning range covers mobile, hand-pushed and fixed units with dry and wet steam and hot-water modes. For a machine shop that is relevant context and nothing more: the only applications the cleaning pages name are vehicle work, parking areas and medical equipment, not turning machinery, and the company's headline figures for patents, projects and technical staff are stated inconsistently on the site, so those numbers are not a usable comparison tool and should be asked for and verified rather than repeated.
What the site does not settle is the lathe scope: whether the mode set of a given unit suits a lathe's deposit, what an hourly water figure would be on your surfaces, whether the accessories fit your machine, and whether your drain route can be signed. Those are settled by the assessment and the trial. The enquiry then carries your record rather than your hope, which is exactly what customized steam cleaning equipment work is meant to be built on.
The fields that make the assessment usable next year
A site assessment earns its keep only if it can be re-read after the people who wrote it have moved on. Include, in addition to the sections above: the date and the writer; the machine list with the family each machine belongs to; per surface line the deposit, the mode decision, the exclusion or the fallback method, and the reach note; the utilities present at that position and who owns each of them; the run-off route with the signature that permits it; the isolation rule and the shutdown window; the trial patches with photographs and the acceptance standard; the stop conditions; the per-family time estimate from two measured runs; the specification rows asked for, with the answers attached; and the review date for the one-page standard.
The marketing wording this supplier uses for high-temperature steam, about efficiency, water use, reliance on chemical detergents and labour intensity, belongs in the assessment as propositions your trial tests, not as savings you have already booked. A site assessment for cleaning lathe exteriors that carries deposits, boundaries, reach, utilities, run-off, isolation and one bounded trial will support a quotation you can compare. One that carries a machine model number and a promise will not.
