Milling Machine Preventive Maintenance Checklist
A precise mill depends on disciplined, repeatable maintenance. The Milling Machine Maintenance Checklist walks technicians through each critical subsystem — base/column and leveling, table/saddle/ways, linear guides and ballscrews, spindle and drawbar, ATC/tool changer, axis drives and feedback, lubrication circuit, coolant and chip management, pneumatics/hydraulics, electrical cabinet, guarding and interlocks, and (if fitted) probing/tool setter. Each line states an observable outcome or measurable value so “OK” isn’t a guess — it’s a standard.
Use it two ways: download the free PDF for clipboard PMs and offline work, or run it in TARGPatrol to assign tasks by machine/shift, timestamp results, and attach photo or video proof (e.g., taper condition, coolant refractometer reading, light curtain/interlock tests). Mixed answer types keep records audit-ready by default: [Flag] for pass/fail checks, [Number] for readings (runout, backlash, drawbar force, coolant concentration, pressures, temperatures), [Media] for evidence, and [Text] for notes, defects, and corrective actions.
Inside the app, completions roll into dashboards and trend views by machine, cell, or plant. Recurring schedules and reminders reduce missed PMs; analytics surface patterns — rising spindle temperature at high RPM, increasing backlash on Y, recurrent coolant contamination — so you can plan parts and interventions before downtime hits. Exports feed safety meetings, quality reviews, and audit packages without extra formatting.
As tooling, fixtures, or processes evolve, update the checklist once and reuse it across similar mills. With a traceable history of who serviced what, when, and with which evidence, you keep accuracy tight, uptime high, and compliance straightforward — while extending spindle life and protecting surface finish and geometric tolerance on every job.
Machine identification: make/model/serial/tonnage (if applicable)
Maintenance interval (Daily / Weekly / Monthly / Quarterly / Annual)
Lockout/Tagout applied, energy isolated and verified
Upload overview photo of locked-out machine and work area
Documentation available: OEM manual, last PM record, parameter backup
Machine hours since last service (hrs)
Open corrective actions from previous PM resolved
Frame, base, column free of cracks/corrosion, mounting bolts tight
Machine level within tolerance (bubble/laser)
Level readings front/back & left/right (mm/m or in/ft)
Table, saddle, and head: surfaces clean, no raised burrs
T-slots and keyways cleaned, chips/debris removed
Way covers intact, smooth travel, no binding
Way wipers present and not torn
Backlash measured: X/Y/Z (µm or thou)
Upload close-ups of way covers and wipers
Guide rails free of scoring, blocks smooth
Ballscrew nuts minimal axial play, couplings secure
Lubricant film present, no rust
Ballscrew end bearing temperature after test (°C)
Taper clean, no fretting (CAT/BT/HSK, size)
Spindle runout at gauge length (µm)
Spindle thermal growth test acceptable
Spindle noise/vibration abnormal
Drawbar clamp force (kN or lbf)
Pull studs inspected, damaged units removed
Upload photo of taper surface and pull stud sample
Pocket/arm alignment OK, no rubbing
Tool change cycle dry-run passes (cycles)
Tool retention/release smooth, no sticking
Carousel/chain tension/drive condition OK
Sensors/confirm switches working
Note any mis-picks or pocket faults
Home/limit switches reliable on X/Y/Z
Servo motors/amps status normal, no alarms
Encoder/cables intact, no oil ingress
Backlash compensation values recorded (X/Y/Z)
Laser/ballbar check performed (if available)
Max circularity error (µm)
Central lube reservoir level, correct oil/grease grade
Pump cycles correctly, pressure gauge within spec
Metering units/injectors firing (visual check)
Manual lube points serviced (count)
Leaks at lines/fittings/way surfaces absent
Tank cleaned or skimmed, chips/sludge removed
Coolant concentration (Brix or %)
Coolant pH within range
Tramp oil level (% or visual)
Filters/bags/screens replaced (qty)
Pump(s) flow adequate, no cavitation
Through-spindle coolant pressure (bar/psi)
Upload photo of coolant sight and refractometer reading
FRL (filter/regulator/lubricator) serviced
System pressure at spec (bar/psi)
Hoses/fittings free of leaks, quick couplers OK
Air dryer/auto drain functioning
Reservoir level, fluid condition (clear/no foam)
Working pressure at spec (bar/psi)
Hoses/actuators free of leaks/chafe
Main disconnect/interlocks functional
Cabinet clean, fans/filters serviceable
Terminals tight, no discoloration/overheat marks
Grounding/bonding resistance (Ω)
UPS/backup batteries date/voltage recorded
Spindle probe tip intact, run calibration routine
Tool setter pad clean and repeatable
Probe calibration offsets stored (X/Y/Z)
Door interlocks operate, bypass not engaged
Fixed/movable guards secure, windows clear and intact
E-stop buttons latch/reset correctly
Worklight covers clean, no exposed live parts
Fire extinguisher present, gauge in green
Chip augers/conveyor operate, no jams
Conveyor belt/sprockets tension and alignment
Chip bins/totes emptied, area clean/dry
Oil-absorbent pads available (pcs)
Floor free of oil/coolant, mats in good condition
Overhead clearance clear, no loose storage
Spare consumables on hand (filters, tips, seals)
List low-stock consumables to reorder
Controller boots without alarms, fans OK
Parameters/offsets backed up to USB/network (date)
Software/firmware version recorded
Alarms history reviewed, recurring faults noted
Warm-up program completed (min)
Spindle test at 500/3000/Max RPM—noise/heat normal
Measured spindle temp rise at Max RPM (°C)
Rapid moves on X/Y/Z smooth, no following error
Positioning repeatability test passed (µm)
Dry tool-change sequence OK (cycles)
Coolant flood/TSC/MQL functions verified
Air blast and chip wash operational
Upload short video of tool change & spindle run (if allowed)
Warning decals and speed/fixture charts legible
Grease/oil types and intervals posted at machine
Next PM due label updated
Defects found (location, severity, part # if known)
Immediate corrective actions taken
Parts required / work order IDs
Machine status: In Service / Restricted / Out of Service
Upload final overview photos (guards closed, area clean)


















