August 18, 2026

Reviewed by XUXIANG Precision Engineering Team Ejector pin clearance must be defined from the mold design, polymer, operating temperature, venting intent and approved component standards; it cannot be reduced to one universal fit number. Verify both the pin and its running bore with traceable measurements, control straightness and surface condition, and assess the assembly under […]

Reviewed by XUXIANG Quality Team A mold insert pocket fit must locate the insert repeatably, support molding loads, allow the intended assembly method and preserve serviceability through temperature and maintenance. “Slide fit” or “tight fit” is not enough. Datums, tolerances, corner relief, seating surfaces, retention and thermal behavior must be defined together. This workflow supports

Reviewed by XUXIANG Quality Team Mold guide pin and bushing clearance must allow repeatable platen-side alignment through the operating temperature range without binding, impact, excess play or abnormal wear. A nominal diameter difference alone is insufficient. Geometry, position, surface finish, hardness, lubrication, thermal growth and assembly datums determine the working fit. This workflow supports precision

Reviewed by XUXIANG Quality Team An ejector pin witness mark should be accepted or rejected against a drawing-defined location, height or depth, appearance zone and functional requirement—not by the vague instruction “no ejector marks.” Ejection necessarily transfers force to the molded part. The engineering task is to place, size and control that evidence so it

Reviewed by XUXIANG Quality Team A mold insert surface-finish specification must describe the intended functional surface, the finishing method and the inspection agreement in terms that design, tooling and molding teams interpret the same way. A vague note such as “polish,” “matte” or “SPI finish” can leave direction, location, cutoff, gloss, texture replication and repair