The engineering question
Start with mold geometry and complete shot definition, then check clamp force, usable injection volume, screw stroke, platen/tie-bar fit, mold height, ejection, and automation. A press that passes one calculation may fail another screen.
What to document
Use manufacturer data for the specific machine configuration; published tie-bar spacing, platen size, clamp force, injection capacity, and mold-height ranges are separate limits.
Practical workflow
Run Clamp Tonnage, Injection Unit Utilization, and Platen Fit from one documented mold/machine record.
Validation boundary
Use manufacturer documentation, grade-specific supplier data, controlled process records, and trials for any equipment, quality, material, or commercial commitment. A static calculator is a transparent starting point, not a simulation or approval.