A press stroke is the most unambiguous signal in the plant.
Exact output with no inference, once debounce is right. Why die changes deserve their own state, and what comparing the same changeover across crews reveals.
Presses are among the easiest machines on any floor to monitor accurately and among the least often monitored. A press stroke is an unambiguous, repeatable mechanical event, and counting strokes gives an exact output figure with no inference at all — which is more than can be said for several far more sophisticated machines.
The reason presses go unmeasured is not technical difficulty. It is that they usually have no controller anyone thought to connect.
| Signal | Source | What it establishes |
|---|---|---|
| Stroke | Existing counter output, or a proximity switch at the ram | Exact output count, with no inference |
| Strokes per minute | Derived from stroke timing | Whether the press is running at its intended rate |
| Running versus stopped | Drive contactor, or stroke recency | Availability, with exact durations |
| Continuous versus single stroke | Mode selector contact | Distinguishes production running from setting and trial |
| Stop reason | Operator, at a kiosk | Die change, coil change, jam, breakdown, quality check |
Stroke counting is exact once debounce is configured for that press. Skipping debounce is the characteristic error here, and an inflated stroke count is not obviously wrong until it is compared against despatch.
Die changes
The dominant loss, and the one most responsive to preparation. Measured precisely, it becomes a SMED conversation with real numbers rather than an impression.
Coil and material changes
Frequent, predictable and rarely logged separately from die changes, which makes both harder to improve.
Jams and misfeeds
Short and frequent. Their rate is a better maintenance signal than their duration.
Running below rated rate
A press set to run slower than its capability, often for a reason nobody remembers. Only visible when strokes per minute are trended against the intended rate.
On most press shops the die change is the single largest availability loss and the one with the clearest improvement path. Measuring it properly means recording it as its own state with a start and an end, distinguishing internal work that requires the press stopped from external work that does not, and comparing the same die change across shifts and crews.
That comparison is where the value is. When the same changeover takes fifty minutes on one shift and eighty on another, the difference is method rather than machine, and it is addressable this month without capital. None of that is visible from a total downtime figure.
Two presses on a live dashboard this week.
A stroke counter and a contactor are usually all it takes. Two presses for thirty days will price your die-change loss precisely.
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