Technician · Mould · Senior
Before removing steel, prove what is actually missing
A hole that appears absent in a drawing is not yet a missing feature in the tool. For senior mould technicians supporting zinc-alloy slider and bag-hardware production, the difficult decision is whether the discrepancy belongs to documentation, physical tooling or a later finishing operation. Drilling an assumed through-hole can turn an unanswered drawing question into an irreversible repair.
The two enquiries below are documented in QLQ's customer knowledge base. The diagnostic method is an engineering recommendation, not a report of work performed for those customers. Neither source records a completed rework or verified production outcome.
Documented enquiry 1: what does the C/W hole mean?
The workshop enquiry summary, section III, records an Indian customer asking what the mould's C/W hole meant and whether it could become a through-hole. This establishes uncertainty about feature intent, not proof that a hole was omitted. The record supplies no agreed expansion of C/W, approved hole dimensions or acceptance result.
Recommended response: ask the drawing owner to identify the callout in a marked section view, state its function and confirm whether it is blind or through. Compare that answer with the tool's physical condition only after matching tool identity and revision. Do not expand an unfamiliar abbreviation from memory or drill merely because a screenshot seems incomplete.
Documented enquiry 2: is this even the correct 5YJO drawing?
The same summary records a request to check a possibly incorrect 5YJO mould drawing. The real-email FAQ, Q57, also records this issue; its suggested reply calls for checking records and whether the attached spring/prong drawing belongs to another mould. That reply describes a verification step, not evidence that corrected tooling was delivered.
Recommended response: resolve the attachment-to-order relationship before comparing features. Record the PI reference, mould identification, drawing number and revision together. A technically detailed inspection of the wrong attachment cannot authorize machining. This case concerns document identity; the first concerns ambiguous feature meaning.
Separate four explanations before choosing a repair
| Possible explanation | Evidence to request | Decision boundary |
|---|---|---|
| Wrong drawing or revision | Order reference, title block, attachment history | Resolve identity; do not classify a tool defect. |
| Feature unclear in supplied view | Designer-issued section/detail and callout clarification | Do not infer depth from a visible circle. |
| Physical feature differs from approved intent | Recorded inspection against the approved drawing | Raise a controlled nonconformance for engineering review. |
| Dispute concerns the finished component | Traceable as-cast and finished samples | Localize the discrepancy before blaming the tool. |
Build a reversible diagnosis across the production route
First preserve the evidence: retain the questioned attachment and label the tool and samples. Keep drilling, grinding and EDM on hold. Inspect tooling only under the workshop's approved isolation and handling procedure; never reach into a running machine to verify a feature.
Next, write the alleged defect as a testable statement: which feature, on which component, against which requirement? Replace “hole missing” with an identified location and an approved requirement, or mark the requirement unresolved. Ask design, toolroom and inspection to review the same marked view.
If the complaint originates after polishing or plating, compare traceable samples from the relevant stages using the approved inspection method. Visibility after finishing is not a substitute for checking geometry. Where only finished samples exist, state that the upstream origin remains unconfirmed. Do not prescribe extra polishing or a bath adjustment as a shortcut around missing evidence.
A rework hold point the next shift can use
Record: tool ID; order/PI; drawing and revision; disputed feature; approved intent; observed condition; inspection method; unresolved questions; decision owner. Engineering should define the modification, affected features and reinspection requirements before release. An email acknowledging receipt is not technical approval. If intent remains unclear, the correct status is “awaiting clarification,” not “repair completed.”
Eight customer questions, answered for senior technicians
1. Can we convert the C/W hole into a through-hole?
Not from the recorded enquiry alone. Obtain the designer's explanation, approved section and review of the proposed change. No universal drilling instruction or customer-approved dimension is available in the source.
2. The 5YJO drawing looks wrong. Should we compare it anyway?
Check the drawing-to-order identity first. FAQ Q57 specifically raises the possibility of a spring/prong attachment belonging to another mould. Detailed measurements cannot make an unrelated drawing authoritative.
3. Can you send drawings before manufacture?
FAQ Q12 describes drawings for customer approval before machining, including relevant part and layout information. For a disputed feature, request a clear detail or section and written clarification rather than relying on a cropped image.
4. Is the drawing ready for confirmation?
FAQ Q75 calls for the latest version and special requirements to be checked. Recommended senior practice is to list unresolved features explicitly and obtain technical sign-off before machining, not approve the file simply because it is the newest attachment.
5. Can the square-punch-to-locating-hole clearance be increased?
the Indian customer asked about this clearance in the workshop summary. A requested value is not an approved setting. Ask engineering to confirm function, datum and affected geometry; this article supplies no transferable clearance value.
6. Can the locating hole use a replaceable insert?
That is another documented the Indian customer question. Treat insert construction as a design review requiring confirmed geometry and retention details. The enquiry does not establish that an insert was designed, fitted or validated.
7. Can a moving core and bottom mould be modified to our drawing?
FAQ Q67 calls for final dimensions, tolerances, production impact and sample-first requirements to be confirmed. That establishes change scope; it does not authorize a separate ambiguous hole modification or demonstrate successful rework.
8. What should we send for a useful engineering review?
Send the tool ID, PI reference, latest approved drawing, disputed attachment, marked feature and available inspection records. Identify whether observations concern tooling, as-cast parts or finished hardware. Unknown requirements should remain explicitly pending.
What Would You Like to Solve?
Use our contact page to send the evidence pack and the decision you need clarified. We normally respond within 2 working days; a response is not machining approval. Agreed dimensions and the required validation must be confirmed before rework.
Source: QLQ internal customer-enquiry records and real-email product FAQs. Historical requests are documented; completed implementation outcomes are not recorded. Recommended checks are engineering guidance, not claims of customer results.