Molding tools that actually run
Free calculators for the studies that set up a molding process, in the order they are run — each one fixes a setpoint the next one holds constant. Enter your own numbers; nothing is stored unless you choose to contribute a study.
- Viscosity curveFixes the injection velocity every later study runs at.Step 01
- Cavity balanceFixes whether the cavities fill alike, and whether the tool or the process is to blame.Step 02
- Pressure dropFixes where pressure is consumed, and how much headroom is left for pack.Step 03
- Cosmetic windowFixes the pack pressure and melt temperature setpoints, at the centre of what passes.Step 04
- Gate sealFixes the hold time, and the target part weight for production monitoring.Step 05
- Cooling timeFixes the cooling time, and with it most of the cycle.Step 06
- Cpk CalculatorCp, Cpk, and a capability verdict from your measurements.Quality
- Shrinkage CalculatorCavity dimension from part dimension, and back again.Design
- Clamp Force CalculatorPress tonnage from projected area and cavity pressure.Process
Three calculations changed in September 2026
Lab studies recompute from your data every time a link is opened, rather than storing an answer — so a study you shared earlier now shows the corrected result. Three methods changed:
- Gate seal is now the first of three consecutive weights within 0.1% of each other, which is the criterion the study procedure on that page always described. It was previously the first single step under 0.5%, which tended to report seal earlier than it happens.
- Viscosity curve takes the optimal velocity from the middle of the shear-thinning plateau rather than the flattest single step, which could land on the edge of the range tested.
- Process capability reports Cpk from within-subgroup sigma and Ppk from overall sigma, labelled separately. The single figure shown before was the overall one, which is Ppk — the number a customer’s SPC package computes.