Moulding is measured in shots, and shots are not parts.
One shot produces as many components as the tool has cavities — and cavity count changes with the tool, several times a week. Why that must never be a machine-level setting.
Injection moulding is measured in shots, not cycles, and one shot produces as many components as the tool has cavities. That single distinction invalidates cycle-based counting entirely: a machine running a sixteen-cavity tool produces sixteen parts per shot, and a system counting shots will understate output by a factor of sixteen.
Cavity count also changes with the tool, several times a week on a job-shop moulding floor, which means it cannot be a machine-level setting.
Machine signals, an energy meter and sensors, on one timeline.
Every injection moulding machine can carry all three. Each part is recorded with the energy it took and the condition of the machine that made it.
What the machine is doing
- State: running, idle, setup, stopped
- Counts and cycle time, per part number
- Stops with reasons from the operator
- Alarms and fault stops
What it costs to run
- kW, kWh, kVA and power factor, live
- Energy per part, per shift and per job
- Idle energy: power drawn while producing nothing
- Maximum demand and load profile
How healthy it is
- Condition sensors connected where they matter
- Per-machine baselines, not generic limits
- Alerts before a trend becomes a breakdown
- Readings stored against every part
Sensors typically connected on a injection moulding machine
An energy meter connection is available on every machine type we monitor. Sensors are chosen per machine at the pilot, and connected by the MachineWise team. See energy monitoring and condition monitoring.
| Concept | What it means | How it must be handled |
|---|---|---|
| Shot | One injection cycle of the machine | Detected from the machine or its PLC; the base event |
| Cavities | Components produced per shot | A property of the tool, not the machine. Set per tool, never per machine. |
| Good parts | Cavities that produced acceptable components | Short shots and blocked cavities mean shots × cavities is an upper bound, not a count |
| Cycle time | Seconds per shot | Tight and repeatable. Drift is meaningful and shows quickly. |
| Tool change | Changeover to a different mould | A major, planned event — measured separately from breakdown |
A moulding machine that runs a four-cavity tool on Monday and a sixteen-cavity tool on Wednesday has two completely different output rates for identical shot counts. If cavity count is configured against the machine, every tool change silently corrupts output, yield and cost-per-part until somebody notices — and on a job-shop floor that can be weeks.
The correct arrangement ties cavity count to the tool and requires the tool to be identified when it is loaded, by selection or scan at the machine. That one input makes shot counts meaningful, and it is the single most important configuration decision on a moulding floor.
It also enables the thing plants find most useful afterwards: blocked-cavity detection. Where actual good parts are counted downstream and compared against shots multiplied by cavities, a persistent shortfall points at a cavity that has stopped producing — which is otherwise discovered at packing, or by the customer.
Tool changes
Long, planned and frequent on job-shop work. The dominant availability loss on most moulding floors.
Material and colour changes
Purging, drying and changeover between materials. Legitimate, and worth measuring as its own category.
Startup scrap and stabilisation
The shots after a change that are not saleable. Real cost, rarely attributed to the change that caused it.
Short cycle-time drift
A machine gradually running two seconds slower per shot is invisible per shot and substantial per month.
What does one part cost in electricity?
With an energy meter on the injection moulding machine, this is measured for every shift and job. Until then, estimate it here with your own numbers.
Values are pre-filled with a typical injection moulding machine. Replace them with yours; nothing you type is stored or sent.
Idle energy is usually the fastest saving: it needs a switch-off rule, not capital. The meter shows it per machine, per shift.
Two moulding machines on a live dashboard this week.
Bring a machine that changes tools often. Getting cavity count tied to the tool rather than the machine is the whole exercise, and it changes every downstream number.
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