The bore is one feature that may need careful explanation when discussing a plastic spool with Changhui. A diameter alone may not identify the face, location or sample that was measured. The first task is to help both parties find the same feature on a drawing or physical sample, rather than immediately assuming the spool will fit particular equipment.
Use an overall photograph or drawing to indicate the viewing direction and give each relevant hole a clear reference. If different openings, steps, bushes or mounting components are present, describe them separately. Where those features have not been established, do not infer them from shadows or camera angles. Keep annotations away from critical edges so the original outline remains visible.
State the units, measurement location and source of every dimension. Keep a nominal drawing dimension separate from a measurement on one sample; record the instrument and method where useful. Photographs can locate features, but perspective, optics and display scaling affect appearance. Image width cannot establish an accurate bore diameter or tolerance.
Where several readings exist, do not retain only the one closest to the expected value. Identify whether readings come from different directions, positions or samples, and preserve the original record. Agree on the method and reference before interpreting differences. This guide specifies no general allowable variation and does not turn an individual reading into an acceptance decision for a whole batch.
Discuss bore information together with the mating shaft, mounting arrangement and relevant drawings. The user of the equipment should verify actual operating conditions. Any need for sample confirmation or further examination should be agreed for the specific application. A seemingly similar diameter alone does not establish suitability for every machine, load or rotational speed.
The illustration originally marked 355mm and PP/ABS identifies the spool appearance; no bore specification has been inferred from it. When contacting Changhui, combine location annotations, dimensional records and open questions. Final dimensions and fit requirements remain subject to the information confirmed by both parties.
