OEE / TPM: measure equipment effectiveness

OEE (Overall Equipment Effectiveness) is the share of planned production time that produced good parts at ideal speed: Availability × Performance × Quality. FreeMaint records it per asset, for a shift or any other period, next to the downtime and work orders of the same machine.

Where to find it

Open OEE / TPM in the Assets & Locations menu. The page shows three gauges (Availability, Performance, Quality) with the overall OEE, the OEE trend, a Six Big Losses Pareto and the list of records. By default it covers all assets over the last 30 days; pick an asset or change the dates to narrow it.

Logging a shift

Click New OEE record, then pick the asset, the period start and end, and optionally a shift label.
Click Prefill from data: FreeMaint fills Unplanned downtime (min) with the downtime already logged on the asset over that period, and suggests a planned production time if that field is empty. Correct either value if needed.
Check Planned production time (min): the time the asset was scheduled to run, minus planned breaks and periods with no production.
Enter Ideal cycle (s/unit), Total units and Good units — good means right first time.
Optionally split the lost minutes across the Six Big Losses. Left blank, FreeMaint counts stops as breakdowns, lost speed as reduced speed and bad parts as defects & rework.
Save. Availability, Performance, Quality and OEE are calculated for you; they are never typed in.

How the figures are calculated

Availability

Run time ÷ planned production time, where run time is the planned time minus unplanned downtime.

Performance

Ideal cycle × total units ÷ run time: the speed lost while the asset was running, short stops included.

Quality

Good units ÷ total units.

OEE

Availability × Performance × Quality. Over several records, the times and counts are added up first, so a short shift weighs less than a long one.

The Six Big Losses

Breakdowns and Setup & adjustment cost Availability; Idling & minor stops and Reduced speed cost Performance; Defects & rework and Startup & yield cost Quality. The Pareto ranks them by minutes lost, so the first bar is the first loss to attack.

Tip

Pick an asset in the filter and each loss on the Pareto gets a Create Kaizen button, which opens an improvement linked to that asset. That button belongs to the Continuous Improvement module, on the Enterprise plan.

Plan and permissions

Business plan

Creating and editing OEE records is part of the Business plan. On every plan, records already logged stay readable and can be deleted.

Who can do what

OEE uses the Continuous Improvement permissions (improvement:read, improvement:create, improvement:update, improvement:delete) and needs access to the asset. By default administrators and managers can do everything, supervisors log and edit shifts, technicians and viewers read. An administrator can change this in Roles.