Start the estimate at the machine, not at the supplier's data sheet
The only workable basis for a lathe cleaning time is the condition of your own machines on your own shop floor. Two identical lathes on opposite sides of the same bay can differ by a factor of several in cleaning effort because one runs oily swarf and the other runs dry, because one is boxed in on three sides, and because one has not had its pan cleaned in months. Published figures on a supplier page describe that supplier's machine and duty, not your lathe and your shift pattern. They are a starting point for a conversation; they are not an estimate.
So the estimate begins as a walk. Stand in front of each lathe with a clipboard and record, per machine, the things that will consume minutes: access on each side, whether the guards and doors actually open, how far the operator has to walk for water, air, a drain and a power point, how much swarf lies loose on the machine versus packed into corners, and whether coolant is still wet on the surfaces or has dried into a paste. That walk takes an hour per machine group and it is the hour that saves the rest of the day later.
Write out the surfaces one at a time, because effort is spent per surface, not per machine
The estimate turns out to be the sum of a list, so the list has to be complete before any number goes next to it. On a typical lathe the surfaces run something like this:
The headstock gives you the top cover, the speed-change panel face, the sight glasses, the labels and the seams around the shift levers. The carriage and saddle give you the cross-slide top, the apron face, the handwheels and the graduated dials. The ways and their covers give you the exposed way surfaces, the telescopic or bellows covers and the wipers at their ends. The chip pan and coolant area give you the hinged pan, the apron beneath the ways, the coolant tank lid and its surrounds, and the return tray. The tailstock and steady give you the barrel, the locking levers and the base. The chuck and spindle nose give you the jaws, the chuck body and the recess behind it. The enclosure gives you the splash-guard panels, the door windows, the door seals and the frame. And the base and stand give you the plinth, the levelling feet, the rear face and the floor ring around the base.
Add a reachability column to that list, and be honest in it. Anything behind a panel that needs tools, inside a guard that does not open, above shoulder height without a platform, or in the narrow gap between the lathe and the wall or the neighbour's swarf bin, is a different task with a different method, not an extra five minutes. The most common cause of an overrun on a lathe clean is a row that was quietly assumed to be reachable.
Type the deposit before you guess the time, because it is the biggest single variable
Time on a lathe exterior is not driven by the size of the machine. It is driven by what is stuck to it, and the same lathe can carry three different deposits in the same week.
Loose swarf sits on top of everything else and has to come off before any wet work starts, because wet swarf turns into an abrasive paste that then has to be chased out of seams. It is removed by brushing, blowing down with a method the shop allows, or picking it off by hand into a bin. It is quick per pass, but it is a pass, and it belongs in the estimate rather than being absorbed into the cleaning minute count.
Oil film and mist residue coats the horizontal faces: headstock top, cross-slide, chuck body, pan lids, the shoulders on the guards. It usually responds to heat plus a short dwell and a wipe, and the effort per row is modest. Where it is worth saving time is on the layout of the work: an operator who moves along the machine in one direction with a clean cloth reaching them finishes a section faster than one who keeps walking back for rags.
Coolant paste and packed swarf lives in the chip pan, under the way covers, behind the splash guards and in the corner where the ways meet the bed. It has been sitting there, absorbing fines, and it behaves like a soft composite rather than like soil. This is where an estimate either holds or collapses, and the honest way to handle it is to time one pan on one machine and use that number for the rest, not to average it against a clean headstock cover.
Dried coolant crust and paint-level staining on older machines, plus corrosion on castings that have lost their paint, set a ceiling on what any routine clean will achieve. Rows in this state should sit in the estimate as an exclusion with a separate method and a separate time, or they should be left out of the routine entirely.
Break the job into blocks that can be timed separately
A single figure for "cleaning a lathe" is not useful, because it hides where the time goes and therefore hides where to reduce it. Facilities that get reliable numbers write six blocks and time each one:
Isolation and handover: powering down, applying the local lock-out or tag rule, confirming the machine is out of production, moving nearby stock and trolleys clear of the working envelope. This is real minutes and it is owned by the shop, not by the cleaner.
Shielding and preparation: covering or taping the way ends, the wipers, the spindle bore, the sight glasses, any exposed bearing or gland, the electrical enclosures and the terminal boxes, plus laying down containment beneath the machine. Preparation is the block every shop under-estimates and every experienced operator over-provides for.
The cleaning pass itself, one line of the list at a time, with the deposit type deciding the method and the dwell.
Drying and re-check: wiping the surfaces that must not stay wet, blowing out seams where liquid collects, then a look along the way surfaces, the chuck recess, the pan corners and the seals with a lamp at a low angle. This is the block that decides whether the machine goes back to a setter or back to a cleaner.
Restore: removing shielding, refitting anything taken off, replacing wipers or covers if they were disturbed, and re-lubricating whatever the machine's own routine requires after the way area has been worked on.
Hand-back: a short run at the controls to confirm the machine homes, that the guards close and that the interlocks still do what they should. This is the block that protects the relationship with the production team, and it is also the earliest signal that something went wrong.
Count the blocks, not the whole job. That is what makes the figure portable to the next lathe, and what tells you which block to attack when the figure is too big.
Define the unit of work so the figure has a unit at all
"Per machine" is too vague to plan against. Two workable units exist. The first is the surface group: headstock, carriage, ways and pan, enclosure, tailstock, base. The second is the reach envelope: everything an operator can work on standing at one side without moving the machine, a platform or a second person. The envelope unit is usually the better one on a lathe, because lathe work is limited by where a person can stand, and because it exposes the fact that the far side of a machine against a wall is a second job.
State the unit in the standard in plain words, and state what the unit does not include: panel removal, guard dismantling, way replacement, deep coolant-tank cleaning, work at height, and any row on the exclusion list. A standard that does not define its boundaries will be blamed for every overrun that was actually a different job.
Count the site conditions that decide the pace, and give each one a value
Most of the variation between two lathes of the same model comes from the shop, not from the machine. Put these in the estimate as named conditions with a value each:
The water point and its distance and hose reach from the working position. The power provision at that position, and whether the operator is walking an extension or moving a machine. The drain or run-off route for the liquid and the swarf-water mix, and who signs for it, because a job that has no lawful route off the floor stops at the point the liquid appears. The consumable supply: how many cloths, brushes, nozzles and litres are within arm's reach before someone leaves the machine. The walk-back distance for everything the operator needs more than once. And the production window: how long the machine is actually allowed to be off, which sets the ceiling on everything above and turns a clean into a sequence choice.
Fixing two or three of these usually moves the total time further than any change of method. It is also why an estimate copied from another site fails: the site conditions came with the copy.
Measure with two runs, and take the number from the second one
Pick one machine in the family, tape off a small area on one surface group, photograph it from a low angle so the texture of the deposit shows, and run the method you intend to use. Then photograph it again and write down what happened: did the deposit lift and come away, did it lift and stay, did the surface change, did anything downstream get wet. Check the same spot the next day, once the shop has run a normal shift, because a lathe that looks clean in the morning and shows a grey film by the end of the shift was not cleaned, it was moved.
Then do the whole machine once, timed, and do it a second time. The first run teaches the operator where everything is; the second run is the number. Write both figures down with the conditions that were in force, and write the stop conditions before the first pass, not after the first surprise: water appearing beyond the containment, a seal lifting, a label lifting, a sight glass going milky, moisture at a gland, or a machine that fails to complete its homing routine.
Once the two runs agree within a range you can plan against, the estimate for the family is that range plus a stated allowance for the condition variables you recorded. Anything beyond that is opinion, and an opinion is what the production team will hear.
Which rows should be excluded from the routine, and what replaces them
An estimate that pretends everything is in scope is not an estimate. On lathes the exclusions come up in the same places every time: the way surfaces and their wipers where the machine's own lubrication regime governs what may be done; spindle bearings and spindle bores; seals, gaskets and telescopic cover fabric; electrical enclosures, terminal boxes, cable glands and their labels; graduated dials, scales and position sensors; safety and rating plates; re-coated or patched paint of unknown history; coolant tanks with accumulated sludge; and pneumatic fittings, air lines and lubricators.
Write each exclusion with a replacement method and the trade it costs: a dry wipe and a hand brush, a dismantle-and-clean by the maintenance trade on a planned shutdown, a label replacement, a re-coat. An exclusion with no replacement is how a machine gets reported as cleaned when half of it was only looked at.
Choose the wet-or-dry and dwell pattern per row, and let that set the pace
For exterior lathe work the practical decision is not between a strong method and a weak one; it is between putting more heat and dwell onto a surface and putting more liquid onto it. Heat and dwell do the work on oil film and on pasted deposit, and they cost time in waiting rather than in wiping. Liquid does the flushing work in a pan, and it costs time in containment, recovery and drying. A horizontal bed face, a chuck recess and a way cover each want a different answer, which is why the pattern has to be fixed for each row of the list and written into the standard.
Two habits hold across most shops. First, loosened soil has to be taken off the surface, not diluted on it; a pass that ends in a wipe away rather than a wipe off is the shortest route to an estimate that needs repeating next week. Second, the temperature that matters is what the surface actually receives at the working distance and angle, not a figure printed on a page; a marked test patch on one machine settles that question for your shop in an afternoon.
What should be in writing when a quotation or an internal standard is requested
A time estimate for lathe exteriors is only as good as the information behind it. Before asking anyone to commit to a figure, put these rows in the request and ask for a written answer on each one, naming the exact unit being quoted rather than the range:
Working voltage and heating load at the working position; what steam or hot-water temperature and pressure are delivered and measured where, and on what test condition; tank or supply volume and the run time that volume actually supports before a refill; the water inlet arrangement and what it connects to on your shop supply; dry-versus-wet operation and how it is switched; the footprint and moving method of the unit, checked against your walkways and door widths; hose and wand reach from the working position; what the protection features cover and which ones apply to an unattended machine; the accessory set and whether a pan, a seam tool and a squeegee are included; and the maintenance items the operator performs and how often.
Ask for the test condition behind every figure. Two pages can carry similar numbers measured in different ways, and a figure taken on a bench does not convert into a lathe in a bay. Also note that the published pages for PowerDe cleaning machines position them around vehicle exterior work, parking areas and medical or industrial equipment rather than around machine tools; any lathe duty therefore has to be settled on your own list of surfaces, your own deposit and your own trial, not inferred from a product page.
The category listing is industrial steam cleaning equipment. If the fixed arrangement with defined water and power at the machine is the shape you are evaluating, the Fixed Steam Cleaning Machine PowerDe HW02 listing is the page to read, and its rows are the record for that one machine: confirm them against your shop supply and your lathe list instead of reading them across. Where a shop needs the arrangement sized around its own machines, that conversation is better held with the supplier's engineering side through customized steam cleaning equipment, with your list of surfaces and your two measured runs in hand.
Turn the measured number into a standard that survives the shift change
One page per lathe family is enough: the list of surfaces in your own words, the deposit type per line, the method and dwell per line, the exclusion column with its replacement named, the reach column, the site conditions with their values, the stop conditions, and a named acceptance check, which for a lathe means what you can see along the way surfaces and the pan corners with a lamp, what a gloved hand finds on the bed shoulder, and what the machine does when it is handed back and asked to home.
Train the standard at the machine rather than in a room, then put a review date on the page. Re-time the estimate when anything that changes the deposit or the access changes: a new coolant, a new tooling pattern, a different swarf type, a machine moved against a wall, or a guard modification. Cleaning-time figures for lathe exteriors go stale quietly, and a review date is the cheapest way to notice.
