Why is the fast half more dangerous?

Dose falls as speed rises, so the same step removes more dose near the fast limit. Undercured parts also tend to look finished.

Where do the two limits come from?

A cure trial on the actual material: slow until damage, fast until cure fails by your accepted test. Limits borrowed from another line are guesses.

How do I measure speed variation?

Log speed through a full production run, including start-up, load changes and warm-up drift, then take the spread.

Does the window move as the lamp ages?

The undercure ceiling does, and it falls with lamp output. A window set on a new lamp overstates the ceiling by end of life.

UV Curing calculator

UV Cure Process Window Calculator: Speed Margin in Dose Terms

Check whether a line speed sits safely inside its cure window. Enter the setpoint, both cure limits and the speed variation the conveyor really holds.

What this calculator does

Check a line speed against its cure window including real variation, and read both margins in dose terms.

Formula used

Margin to nearest limit = MIN(current − slow, fast − current)
Worst-excursion margin = nearest margin − speed variation
Inside window = 1 when the nearest margin is not negative
Dose change at slow limit = (current ÷ slow − 1) × 100
Dose change at fast limit = (current ÷ fast − 1) × 100

Inputs explained

Current Line Speed: The speed the line runs at now.
Slowest Allowed Speed: Below this the parts take too much dose.
Fastest Allowed Speed: Above this the parts receive too little dose.
Speed Variation: How far the conveyor wanders from setpoint.

How to use the result

Best suited to checking a speed against real variation, choosing which direction to move a setpoint, re-checking a window as a lamp ages.
Dose-change rows assume dose scales exactly with 1/speed. Treats the limits as hard edges when cure degrades gradually. Cannot see the ceiling dropping as the lamp ages.

Common questions

Why is the fast half more dangerous? Dose falls as speed rises, so the same step removes more dose near the fast limit. Undercured parts also tend to look finished.
Where do the two limits come from? A cure trial on the actual material: slow until damage, fast until cure fails by your accepted test. Limits borrowed from another line are guesses.
How do I measure speed variation? Log speed through a full production run, including start-up, load changes and warm-up drift, then take the spread.
Does the window move as the lamp ages? The undercure ceiling does, and it falls with lamp output. A window set on a new lamp overstates the ceiling by end of life.

Last reviewed 2026-10-01.