Temperature-Driven Variance
Morning cycles (cool environment): 45 seconds. Afternoon cycles (warm environment): 48-49 seconds. This 8% variance appeared environmental but wasn't systematically addressed.
What Became Visible
Cycle-time vs. ambient temperature correlation showed direct relationship: every 1°C increase caused 0.5-1% cycle-time increase. Material properties (solder flow), air pressure (viscosity), and equipment thermal expansion all contributed.
Environmental Stability Investment
Facility implemented environmental control system maintaining 23±2°C. Temperature-driven variance eliminated.
How it worked: Environmental stabilization removed a major variance source. Cycle-time became consistent across all times of day.
Results
vs ±4°C previous
from cycle-time consistency
from stable operating conditions
Environmental factors can significantly impact cycle-time. Stability investment pays back through improved consistency and throughput.
Operational Reality
Temperature-driven variance was invisible until correlated with cycle-time. Environmental control investment became justified by throughput gains.