Technical Guide3 min read

How to Verify Free-Flange Ejector Pin Position During Maintenance

Key Takeaway: Add free-flange position verification to your standard mold maintenance checklist. Check: (1) flange axial position ±0.05mm, (2) clamping torque, (3) shaft surface condition at the set screw contact point.

Maintenance Checklist

Position check: Measure pin protrusion from the mold face at ejector home position. Compare to the documented specification (±0.05mm).
Clamp torque: Re-torque set screws to 1.5–2.0 Nm. For collet types, verify the clamp nut is finger-tight + 1/4 turn.
Shaft inspection: Look for galling, scoring, or excessive set screw indentation on the shaft surface.
Flange body: Check for cracks in the collet bore or stripped set screw threads. Replace the flange body if damaged.

Frequently Asked Questions

What is the service life of a free-flange mechanism?+

The flange mechanism (collet or set screw) typically lasts 1–2 million cycles without degradation. The pin shaft itself has the same wear life as a standard ejector pin. Replace the flange body when the set screw thread is stripped or the collet no longer grips the shaft.

Can I replace just the flange without replacing the shaft?+

Yes — on collet-type free-flange pins, the flange body slides off and can be replaced independently. On set screw types, the entire pin assembly must be replaced because the set screw indentation on the shaft is position-specific.