Why do the two loss figures not add up?

Uptime and yield multiply, so part of the shortfall only appears when both are fixed. That overlap belongs to neither single fix.

Should I load more parts per fixture?

Only if the added positions still cure. Gross capacity rises with loading, but the cycle ends when the worst-lit part has its dose, so edge positions often lower net output.

My cure rejects are always the same fixture positions. Why?

That is a fixturing problem, which is usually cheap to fix. Shadowing, spacing or angle starves those positions, and rotation or a reflector helps; more lamp power overcures everything else.

Where should loading time go?

In the cycle rate if loading happens every cycle. Reserve uptime for changeovers, breakdowns and waiting, and never count the same minutes in both.

UV Curing calculator

UV Batch Cure Capacity Calculator: Honest Loss Attribution

Find what a batch UV cell really produces and where the shortfall sits. Enter parts per fixture, cycles per hour, uptime and first-pass yield.

What this calculator does

Net good output from a batch UV cell, and what fixing uptime or yield alone returns.

Formula used

Gross fixture capacity = parts per fixture × cycles per hour
Net good parts per hour = gross × uptime × first-pass yield
Recovered by fixing uptime = gross × (1 − uptime) × yield
Recovered by fixing yield = gross × uptime × (1 − yield)
Recovered only by fixing both = gross × (1 − uptime) × (1 − yield)

Inputs explained

Parts per Cure Fixture: Parts loaded per cycle; added positions must still clear the dose.
Cure Cycles per Hour: Complete load-cure-unload cycles achieved in one hour.
UV Cell Uptime: Share of scheduled time the cell actually cycles.
First-Pass Cure Yield: Parts passing cure at the first attempt, often position-driven.

How to use the result

Best suited to deciding whether to load a fixture fully, ranking handling against cure improvements, estimating batch cell capacity for scheduling.
Cannot see which fixture positions fail; a clustered 3% and a spread 3% need different fixes. Ignores the cycle-time penalty of loading a fixture more fully. Says nothing about dose; a fast cell can short the cure entirely.

Common questions

Why do the two loss figures not add up? Uptime and yield multiply, so part of the shortfall only appears when both are fixed. That overlap belongs to neither single fix.
Should I load more parts per fixture? Only if the added positions still cure. Gross capacity rises with loading, but the cycle ends when the worst-lit part has its dose, so edge positions often lower net output.
My cure rejects are always the same fixture positions. Why? That is a fixturing problem, which is usually cheap to fix. Shadowing, spacing or angle starves those positions, and rotation or a reflector helps; more lamp power overcures everything else.
Where should loading time go? In the cycle rate if loading happens every cycle. Reserve uptime for changeovers, breakdowns and waiting, and never count the same minutes in both.

Last reviewed 2026-10-01.