Discover Thousands of Hidden Production Hours in Your Factory
Most factories have unused production capacity hidden in their existing operations. This article explains where that capacity is lost, how to calculate its impact, and how relatively small improvements can recover hundreds or thousands of production hours.
What Is the Hidden Factory?
The hidden factory refers to production capacity that could be available but is currently lost through inefficient scheduling, downtime, reduced production speed, or quality problems.
For example, a machine scheduled for 2,000 hours per year with an OEE of 60% delivers the equivalent of 1,200 hours of good-quality production at its expected speed.
The remaining 800 hours represent production losses.
Not all losses can be eliminated, but understanding where they occur is the starting point for improving capacity.
Four Sources of Hidden Production Capacity
1. Schedule Losses – When Machines Are Not Scheduled
Schedule losses represent time when equipment could be used but no production is scheduled.
Example: Adding production without buying another machine
A factory operates a machine for two eight-hour shifts per day, five days per week.
- Scheduled production: 80 hours per week.
- Potential operating time across three shifts: 120 hours per week.
- Additional schedulable time: 40 hours per week.
If demand, staffing, and other resources allow, introducing a third shift could provide up to 2,000 additional scheduled machine-hours annually, assuming 50 operating weeks.
This is additional scheduled capacity, not necessarily 2,000 hours of good production. Actual output will depend on OEE and other constraints.
2. Availability Losses – When Machines Are Stopped
Availability losses occur when production is scheduled but equipment is not producing.
Example: Reducing recurring breakdowns
A machine experiences an average of 30 minutes of unplanned downtime per shift.
With three shifts per day and 250 operating days per year:
| Measure | Result |
|---|---|
| Lost time per shift | 30 minutes |
| Lost time per day | 1.5 hours |
| Lost time per year | 375 hours |
| Recovered time if downtime is halved | 187.5 hours |
Reducing downtime by 50% recovers almost 188 machine-hours annually.
If ten similar machines achieve the same improvement, the total becomes 1,875 machine-hours per year.
3. Performance Losses – When Machines Run Too Slowly
Performance losses occur when equipment runs below its expected production speed.
Example: Increasing production speed
A production line is designed to produce 100 units per hour but averages 90 units.
The line operates for 2,000 hours annually.
| Measure | Current | After improvement |
|---|---|---|
| Average speed | 90 units/hour | 95 units/hour |
| Annual operating hours | 2,000 | 2,000 |
| Annual production | 180,000 units | 190,000 units |
Increasing average speed by just five units per hour produces 10,000 additional units annually, assuming the same operating hours and no change in quality.
At the expected speed of 100 units per hour, this represents 100 hours of additional equivalent production capacity.
4. Quality Losses – When Products Are Scrapped
Quality losses occur when production resources are consumed without generating approved output.
Example: Reducing scrap
A production line manufactures 500,000 units annually with a scrap rate of 4%.
| Measure | Current | After improvement |
|---|---|---|
| Total production | 500,000 | 500,000 |
| Scrap rate | 4% | 2% |
| Scrapped units | 20,000 | 10,000 |
| Approved units | 480,000 | 490,000 |
Reducing scrap from 4% to 2% generates 10,000 additional approved units without increasing total production.
At a production rate of 100 units per hour, this corresponds to 100 hours of equivalent good production.
The improvement also reduces wasted material and associated production costs.
What Happens When Small Improvements Are Repeated Across a Factory?
Consider a factory with 20 machines, each scheduled for 120 hours per week over 50 weeks.
Recovering one additional productive minute per scheduled hour gives:
| Calculation | Recovered capacity |
|---|---|
| Per machine, per week | 2 hours |
| Per machine, per year | 100 hours |
| Across 20 machines, per year | 2,000 hours |
That is equivalent to 250 eight-hour machine shifts.
These are recovered machine-hours, not necessarily additional factory output. For example, improving a machine that is not a production bottleneck may have little immediate effect on total throughput.
However, the recovered capacity may still reduce overtime, create scheduling flexibility, or allow future production growth.
Finding the Losses That Matter Most
Not all production losses have the same impact.
Consider a factory with three production lines:
| Production line | Main problem | Annual loss |
|---|---|---|
| Line A | Machine breakdowns | 420 hours |
| Line B | Material shortages | 280 hours |
| Line C | Extended changeovers | 150 hours |
| Total | 850 hours |
The first step is to understand which losses can realistically be reduced.
For example:
- Reducing breakdowns on Line A by 25% recovers 105 hours.
- Reducing material shortages on Line B by 50% recovers 140 hours.
- Reducing changeover losses on Line C by 20% recovers 30 hours.
Together, these improvements recover 275 machine-hours annually.
The next question is whether those hours can be converted into additional output or lower operating costs.
Using Good Solutions to Investigate Hidden Capacity
Different types of production information help answer different questions.
| Question | Where to investigate |
|---|---|
| Which machines have the lowest OEE? | OEE Dashboards and Reports |
| Why did a machine stop repeatedly yesterday? | Timeline |
| Which stop reasons consume the most time? | Stop loss analysis |
| Are certain Articles produced below expected speed? | Performance data and Reports |
| Which production areas have the highest scrap? | Quality reporting |
| Did our improvement reduce downtime? | Compare performance across time periods |
For example, a Production Manager might discover that a machine loses four hours per week due to material shortages.
After working with Logistics to improve material availability, the loss decreases to one hour per week.
The improvement is:
- 3 recovered machine-hours per week.
- 150 recovered machine-hours per year, assuming 50 operating weeks.
The result can then be followed up using the same production data.
From Recovered Hours to Business Results
Recovering production capacity does not automatically increase profitability. The result depends on how the capacity is used.
There are two common approaches:
Capacity Up: If additional customer demand exists, recovered hours can be used to increase output without necessarily adding machines or shifts.
Cost Out: If demand is unchanged, improved efficiency may allow the same output to be produced with fewer staffed hours, less overtime, or reduced resource consumption.
For example, recovering 300 machine-hours annually could allow a factory to avoid 300 hours of overtime, provided production can be rescheduled accordingly. Alternatively, those hours could be used to produce additional customer orders.
Key Takeaways
The hidden factory consists of production capacity lost through scheduling, downtime, reduced speed, and quality problems.
The examples demonstrate that:
- Halving 30 minutes of downtime per shift can recover approximately 188 hours annually per machine.
- Increasing production speed from 90 to 95 units per hour can generate 10,000 additional units over 2,000 operating hours.
- Reducing scrap from 4% to 2% can recover 10,000 approved units from a production volume of 500,000.
- Recovering just one minute per hour across 20 machines can create 2,000 additional productive machine-hours annually.
The important task is not simply to find lost hours, but to identify which losses can be reduced and how the recovered capacity can be used.