Shot Size Calculator
How big a shot does your mould need — and which machine barrel does it fit? Enter part volume, material density, runner allowance and cavitation. The machine sizing rule follows our cycle time & clamp force guide.
How to use the result
A shot should use roughly 20–80 % of the barrel capacity: below that the melt sits too long and risks degradation, above it the screw cannot plasticise consistently. The tonnage hint assumes a typical shot capacity for the machine class — always cross-check the mould on the clamp force calculator, because projected area, not shot weight, sets the clamp requirement. Background on the physics is in the cycle time & clamp force guide.
Densities are typical values for unfilled grades from published datasheets; glass-filled variants run denser. Machine shot capacities are indicative maximums per tonnage class — real machines vary with screw diameter, and the 20–80 % utilisation rule is a shop rule of thumb, not a machine specification.
Unsure which machine your mould belongs on? Send Nordmould your part — request a project-specific breakdown of tooling, part price, timing and quality requirements.