A quotation for cleaning the outside of a vertical machining centre, a bed-type mill or a machining cell usually names the machine and nothing else. The accessories arrive as a list of part numbers, and the buyer learns what each one is for on the day the unit is delivered.
Those accessories decide which questions your wash answers. They set whether the work reaches the way covers and the chip conveyor, or stops at the flat panels. They decide whether oily water is caught or runs to the floor drain, and whether the control cabinet survives the wash. Read the accessory list against the surface, the soil and the drain route you actually have.
Reach items decide which parts of a milling machine you can clean at all
Cleaning the outside of a machine tool is a job with awkward geometry, and machine tool steam cleaning has to reach that geometry to be worth specifying.
A mill is tall and full of overhangs: the tool-changer arm, the coolant nozzle manifold, the top of the enclosure, the rear of the table and the area behind the chip conveyor.
Ask for three lengths in writing: hose, wand or lance, and electrical cable. Then walk the distance from where the machine will stand to the farthest panel you intend to clean, and on to the water point and the drain. A hose that reaches only the front of the enclosure leaves the rear and the top untouched, and the crew ends up cleaning the easy faces.
Ask what each reach item does rather than what it is called. A short extension moves steam into the gap between a way cover and the casting. A bent head lets you work a horizontal panel without pointing the stream at your own hand. A brush head holds contact on a textured or ribbed surface where a bare jet slides off.
Get the connection type for each piece as well. A fixed unit may be fed from a tap-water inlet with a four-point internal-tooth joint of 1/2 inch. A coupling that does not match your tap stops the job on day one, so test the fit before the machine is ordered rather than after it is installed.
Match each attachment to the deposit it has to remove
The outside of a milling machine carries a mixture rather than one kind of soil. Expect cutting oil removal equipment duties on the panels and around the coolant tank.
Add the rest of the film to that list: graphite and fine swarf, dried coolant on the painted panels, and residue at the fill point and on the chip conveyor.
Write the deposit down panel by panel, then ask which attachment addresses it. Heat does most of the work on a polymerised oil film. Contact and dwell do most of the work on a dry crust. Brushing works on ribbed guards and castings where a jet alone leaves the soil in the valleys.
Ask which mode a machine offers and how it is changed. Dry steam and wet steam behave differently on a vertical surface: one leaves less moisture behind, the other carries more heat into a thick deposit. On a machine with electrical devices mounted on the outside, two settings decide the result. One is the mode you choose. The other is the distance you hold the lance. Neither is fixed by the catalogue label on the attachment.
Attachments that protect the parts that must stay dry
On most factory machinery the soil is a blend of oil, grease and airborne grime, so factory machinery degreasing is the task you are actually specifying accessories for. The point of the accessory list is to do that job without wetting what must stay dry.
A milling machine exterior is not one surface, and several parts of it react badly to a jet aimed at them. Check the way covers and their seals, the spindle area, and the encoder and servo connectors. Then check the cable glands, terminal boxes and the motor fan cowl, the reservoir breathers, the drain and vent plugs, and finally the rating plates and painted decals.
Ask for the items that control the flow. A shield or baffle sits between the stream and an adjacent panel. A narrow tip works along a seam without loading it with water. A brush cleans a nameplate area without driving water behind it.
Then write the exclusion list into the work instruction before the trial, not after. State which openings are covered and which connectors are masked. State which seals are never jetted, and which painted areas with chipped coating are left out of heat work.
Ask whether degreasing the exterior is treated as a routine duty on the machine you own or as a one-off job. A routine duty needs accessories that survive weekly use and can be stored ready to hand; a one-off job may be served by a single attachment borrowed for the week.
Low pressure and a moving lance reduce the chance of lifting a seal lip and pushing contamination past a wiper. An accessory that lets you work at a distance is not a substitute for covering the opening, and the two are used together or not at all.
Accessories that handle what comes off the machine
Washing an exterior produces oily run-off mixed with swarf, and a mill sits above or beside floor drains, cable trays and other machines. Ask for a drip tray or collection pan sized to the footprint you are washing, a container for the collected liquid, and a route for the run-off that your site permits.
Ask separately whether a machine's own listing includes moisture recovery, because catalogue pages differ on that row. Some print it and some do not, so read the page of the exact variant you are being quoted rather than assuming the range shares the function.
Storage and handling belong in the same question. A hose and cable that must be dragged across a finished panel or an occupied aisle will be used less, and the work shrinks back to the reachable panels. Ask how the accessories are stored with the machine and whether they travel with it.
Ask what the accessories add to the footprint as delivered. Published overall dimensions may already include handles and hoses, so read the note attached to the figure before you measure the space you have cleared for the unit.
Get the accessory list in writing and prove it on your own machine
Send the same question list to every supplier, and ask the same questions in the same order. Cover the accessories included as standard and the ones priced separately.
Ask for the function of each item in one sentence. Then ask for the lengths and connection sizes, then for the containment and protection items. Finish with the wear items and the interval at which they are replaced.
Ask for the figures that matter to your shop in your own units, for the exact machine quoted: working supply, reach, tank or reservoir volume, and runtime between refills. A catalogue table and the delivered unit can differ, and the difference is usually found by whoever has the written figures to compare against.
Then run one bounded trial on one machine you choose: a defined panel, a defined deposit, the accessories you intend to use, and the exclusion list applied from the start.
Record four things during that trial. Note the time taken on each panel. Note what was shielded and what that shielding cost in time. Note the quantity of run-off and where it went. Note whether the machine was ready for the next job once the surfaces were dry.
Catalogue figures describe what the accessories can do. Your own record says whether they do it on your machine, and that record is what you hand to the crew with the work instruction.
