How to Set and Lock Free-Flange Ejector Pin Position
Key Takeaway: Set the flange position with the pin installed in the mold, using the ejection stroke length to determine placement. Tighten the locking mechanism to 1.5–2.0 Nm for set screw type, or finger-tight + 1/4 turn for collet type.
Positioning Procedure
- Insert the pin into the mold bore (shaft first, flange last).
- Set the ejector plate to its home (retracted) position.
- Slide the flange along the shaft until it sits flush against the ejector plate surface.
- Tighten the locking mechanism (set screw: 1.5–2.0 Nm; collet: finger-tight + 1/4 turn).
- Cycle the ejector plate to full stroke and verify the pin extends the correct distance.
- Check that the flange remains in position after 10 manual cycles.
Locking Mechanism Comparison
| Feature | Set Screw | Collet Clamp |
|---|---|---|
| Positioning precision | Infinite (any position) | Infinite (any position) |
| Clamping force | High (up to 500N) | Medium (up to 300N) |
| Shaft marking | Yes (set screw indentation) | No (non-marking grip) |
| Re-positioning ease | Moderate (loosen, slide, re-tighten) | Easy (quick-release, slide, re-clamp) |