By Morris Hua – VNO Technical Director
DELIVERY DOCUMENT
| CHINA | WESTERN | ACTIONS | RMK |
| Deliver goods only. | Deliver goods plus quality documents | 1. Specified required quality documents in the PO. 2. Acceptance inspection with documents review at first. |
For customer, if quality document is no or not qualified, rejection will be issued directly no matter how good your parts are. |
GAUGE CALIBRATION
| CHINA | WESTERN | ACTIONS | RMK |
| 1.Never calibrate gauges till customer inform parts not qualified.
2.Gauge Calibration is too expensive and waste of time. |
All the gauge must be calibrated within a certain period or usage frequency. | Keep auditing gauge control procedure & evidence to ensure all involved gauges are within calibration valid time. | One time rejection can be worth many years’ calibration. |
MATERIAL TRACEABILITY
| CHINA | WESTERN | ACTIONS | RMK |
| We can ensure you the material is the right material, no need to control the traceability, waste of time. | Full traceability required, each part can be traced back its unique melt number, Heat number, original mill material certificate, its purpose is for quarantines and recall efficiently. | 1, Specify traceability requirements in the PO. 2. Traceability Procedure established by suppliers. 2. On site audit to ensure actions effectively in function. |
Recall all the batches or one traceable batch, many companies get huge loss for one failure of traceability. |
MANUFACTURER PROCESS
| CHINA | WESTERN | ACTIONS | RMK |
| No manufacture process or process as simple as possible. Quality ensured by skilled or experienced workers. | Good & detail manufacture process can ensure consistently produced parts no matter who the operator is if only he is qualified to a set standard. | 1. Manufacture Process established when sample making.
2. Any change of the process must be approved from sample under revise process, sometimes by inner system, sometimes by customer. |
Process keep revising for competitive and consistence producing. Century enterprise is generated from this system. |
TOLERANT
| CHINA | WESTERN | ACTIONS | RMK |
| Some part in upper limit, some part in lower limit, you cannot reject my parts within tolerance. | A tolerance specified is for supplier to choose a point for consistently producing. Sometimes a poor Cpk can also be lead to rejection. | 1. Machining datum must be set up and maintained in strict tolerance to ensure followed dimension’s accuracy. 2. Tooling or cutter’s weariness must be put into consideration when design a machining process. |
Consistence requirement will improve the level of a supplier actually. |
NON DIMENSIONAL FEARTURES
| CHINA | WESTERN | ACTIONS | RMK |
| Dimensional features take high priority, note or remarks not important to put into consideration. | Remarks or Notes have the same even more importance than dimensional features, it is directly affect the function of the part. | 1, All feature must be included in manufacture process especially non-dimensional features. 2. Inspection plan have the non-dimensional features in FAIR form. |
Currently 80% rejection due to non-dimensional features. |
INSPECTION METHOD
| CHINA | WESTERN | ACTIONS | RMK |
| Randomly pick up gauges to inspect. | Consistent gauge should applied during inspection. | 1. Gauge used for any features specified in FAIR form. 2. Special gauge like plug gauge, self made gauge be introduced in inspection to improve consistent inspection. |
Rejection happen very frequently due to the difference inspection method between customer & suppliers. |
SUBCONTRACT CONTROL
| CHINA | WESTERN | ACTIONS | RMK |
| Sub-contract suppliers is not me, I cannot control it well, can you anodize or plate the part in your country? | Subcontract control is part of manufacture process, accountable by suppliers. | 1. Subcontract work must have PO issued, including technique detail specified as a attachment.
2. Sub-contract should be applied to Qualified supplier list |
Sub-contract becomes a challenge and main issue during manufacture in past years in China. |
SURFACE FINISH
| CHINA | WESTERN | ACTIONS | RMK |
| Surface finish is not so important as functional features, we are not producing art work. | Parts must maintain its brand new status when acceptance inspection on customer’s site. Rejection will be happened if surface defects found. | 1. Manufacture process must have surface control included such as inner transportation between processes. 2. Acceptance inspection have surface finish included. |
Good quality not only inner, outlook express also included. |
PACKAGING
| CHINA | WESTERN | ACTIONS | RMK |
| Packaging is a minor thing compare with machining/plating. | Packaging must protect the quality status including surface finish during transportation. | 1. Packaging plan must included in manufacture process. 2. Packaging must be inspected and approved before shipping. |
Perfect, High value goods become trash when arrived in customer. |
