Cosmetic Window
Sweep two parameters against each other and judge each combination pass or fail. The tool bounds the region that passes and finds its centre — because a setpoint on the edge of the window makes good parts only until the first thing drifts.
Trials
Material
Melt °C
Mold °C
Horizontal axis
Vertical axis
Judge at least two trials to map a window.
- One row is one trial: two setpoints, then a pass or fail on the part.
- A window needs failures on both sides — passes alone leave it open-ended.
- Judge every trial; an unjudged one is set aside, not counted as a fail.
How to run this study
Map which combinations of two process parameters produce a cosmetically acceptable part, and how much room surrounds the centre. A process set on the edge of its window makes good parts until the first thing drifts.
Procedure
- 01Choose the two parameters to sweep. Hold pressure against melt temperature is the usual pair.
- 02Pick three to five levels on each axis, spanning wider than you expect the window to be.
- 03At each combination, mold five shots to stabilise, then judge the last part against the acceptance criteria.
- 04Record pass or fail for every combination, and for a failure, which defect appeared.
- 05Enter the grid — the tool bounds the passing region, finds its centre, and reports how wide it is.
- 06If a passing point sits at the edge of what you swept, extend that axis and repeat: the window was never closed on that side.