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Aim for a "sweet spot" where your part weight is 20–80% of the machine's maximum shot capacity. If the ratio is too low, the resin may degrade; if too high, it leads to inconsistent melt quality.
Never buy a machine based on photos alone. Use this checklist during a physical inspection:
Measure for parallelism ; misalignment can damage molds. Look for cracks, pitting, or rust on the tie bars.
This is the pressure required to keep the mold closed during injection. A common rule is to add a 10–20% safety margin to your calculated minimum to prevent "flash" (excess plastic).
Cheaper upfront and easier to repair, but uses more energy.
Request a test run under load . Watch for consistent cycle timing, stable pressure readings, and any abnormal vibrations. 3. Evaluation of History and Brands
Offers 30–50% energy savings , higher precision, and cleaner operation, though repairs are more specialized. Hybrid: Combines servo-electric speed with hydraulic power. 2. Essential Pre-Purchase Inspection Checklist
