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Robotics Metal-Part RFQ Checklist: Define Requirements Before Choosing a Process
Before choosing a manufacturing process for a robotics metal component, define the controlled drawing and model revision, material specification and condition, functional interfaces, critical features, prototype and production quantities, finish, and inspection acceptance requirements. Record requested timing and unresolved assumptions separately. These inputs support a part-specific review of casting, die casting, CNC machining, stamping or forging; the component's appearance alone does not establish process suitability.
1. Start with a controlled product definition
A useful robotics metal-part RFQ describes what the buyer needs accepted, not simply what a component looks like. Identify the part number, drawing revision, model revision and units. Explain which document takes precedence if the drawing and model disagree. Include a readable drawing with the information needed to interpret the model; a rendered image is not a substitute for dimensions or acceptance criteria.
State whether the design is released, under review or preliminary. Keep open questions separate from approved requirements, and review changed features against the new revision.
2. Specify material requirements without assuming availability
Provide the buyer-required material designation, applicable specification and required condition. Distinguish a firm requirement from a preferred option. If heat treatment or material documentation is required, identify the requirement and the evidence expected with the parts.
3. Identify the features that control function and assembly
Mark the features that determine fit, location, movement or assembly. Examples of buyer inputs include a mating-hole pattern, locating surface, threaded interface or surface that must remain free of coating. State the mating relationship and the consequence of a nonconforming feature rather than marking every dimension equally critical.
Define the datums and tolerance requirements used to assess those features. Where function depends on relationships between features, ensure the drawing expresses that relationship. Review questions should distinguish the finished-part requirement from any proposed manufacturing method or inspection setup.
| Buyer-defined function | Accepted feature or state to define | Evidence to agree before route approval |
|---|---|---|
| Locating a mating component | Interface geometry, datum relationships and accepted assembly condition. | Controlled mating definition and required dimensional report. |
| Maintaining movement clearance | Relevant geometry and whether clearance applies after finishing. | Buyer-defined inspection or functional acceptance instructions. |
| Providing a fastening interface | Joint features, material condition and any protected surfaces. | Drawing requirements and specified acceptance records. |
4. Separate prototype demand, production demand and requested timing
List prototype quantity, initial production quantity and anticipated recurring demand separately. Identify whether prototypes are intended for appearance review, fit checks, functional testing or another buyer-defined purpose. Do not assume a prototype route establishes the eventual production route or production acceptance condition.
Include requested timing or a project milestone and explain what needs to be ready at that point. Mark timing, quantities or milestones as unknown if undecided; an incomplete schedule should not prevent an initial inquiry. Requested dates are buyer inputs for review, not confirmed delivery commitments.
5. Define finish and inspection in the accepted condition
State the required surface finish or treatment, its applicable specification, appearance criteria and any masking or untreated areas. Explain whether dimensions and functional checks apply before or after finishing. A visible color or texture alone is not a complete finish specification.
Identify first-article, ongoing inspection and final acceptance requirements where applicable. Include critical-feature reporting, material or process records, traceability expectations and any buyer-required sampling or inspection instructions. If the measurement method matters to acceptance, record it for agreement instead of assuming different methods will produce interchangeable results.
6. Compare process questions, not unverified suitability claims
The following table organizes questions for a part-specific review. It does not recommend a process, assign a route to a pictured component, or confirm Castle Mechanical capability for a particular project. The drawing, requirements and commercial assumptions must be considered together.
| Process under review | Buyer questions to resolve |
|---|---|
| Casting | Which features belong to the blank and which require later machining? What blank definition, tooling information and machining allowance are available? |
| Die casting | What tooling information exists? Which draft, wall transitions, critical interfaces and secondary operations require review against the finished drawing? |
| CNC machining | What starting material condition is required? Which datums, feature access, setups and final inspection requirements need to be clarified? |
| Stamping | What sheet thickness, formed geometry, bend and edge requirements, tooling status and secondary operations are defined? |
| Forging | Is a blank definition available? How should machining allowance, datum transfer, any heat-treatment requirement and final geometry be reviewed together? |
7. Assemble an engineering RFQ checklist
Use one requirements package so that drawing, quantity and acceptance assumptions can be reviewed consistently:
Part identifier, controlled drawing and model revisions, units and document precedence.
Buyer-required material specification, condition and supporting documentation.
Function, mating interfaces, critical features, datums and acceptance criteria.
Prototype purpose and quantity, production quantities and recurring-demand assumptions.
Requested timing or project milestone, with undecided items marked unknown.
Finish requirements, masking and the condition in which dimensions are accepted.
Inspection stages, reporting, traceability and buyer-required records.
Available tooling information, secondary operations and unresolved questions.
Delivery destination and any required packaging or handling instructions; mark undecided details unknown.
8. Resolve open decisions before selecting a route
Record each open item with its current assumption, decision owner and the stage at which it must be confirmed. For example, a buyer may know the mating interface but not yet have an approved finish. Mark that distinction; do not silently turn a preliminary preference into a purchase requirement.
Request that any quotation identify exclusions, assumptions and items needing confirmation. When a decision changes, update the controlled package and review the affected route, inspection and commercial assumptions. The goal is a shared definition of the accepted part, not a premature process commitment.
For each candidate route, record the assumed blank or tooling definition, secondary operations and final inspection condition. Name the decision owner and the evidence needed to approve or reject each assumption. Keep prototype learning, product-definition approval and production-route approval distinct, with unresolved items visible in the next review.
9. Frequently asked questions
Can we request review before choosing a manufacturing process?
Yes. Present the required part definition and identify process selection as unresolved. A review should assess the requirements rather than infer suitability from an image or from the fact that a process is listed.
Is a 3D model enough for a robotics metal-part RFQ?
A model alone may omit requirements needed for quotation and acceptance. Supply the controlled drawing and clarify material, tolerances, finish, inspection and document precedence; identify anything not yet defined.
What should we send if material or timing is undecided?
Mark the item unknown and explain the known function, constraints or milestone. An initial discussion can identify missing decisions without inventing a specification or treating an unconfirmed date as a delivery promise.
Should prototype and production requests be combined?
They can be included in one RFQ, but label their quantities, purposes and acceptance requirements separately. Ask for differences in assumptions to be identified rather than assuming one route or tooling arrangement covers both.
When should coating and inspection requirements be discussed?
Include them in the initial requirements package. Clarify the accepted condition, masking, functional surfaces and required reports so that finishing and inspection are reviewed with the drawing, not added as ambiguous final steps.
Does the robotics concept illustration show a delivered customer product?
No. The campaign image is an AI-generated engineering concept illustration, not a Castle Mechanical customer product or completed robotics manufacturing project. Its appearance is not evidence of material, process, capability or suitability.
10. Start a private requirements discussion with Castle Mechanical
Send your requirements summary and open questions to info@castleintl.com. Please retain reference ROBOTICS-WEB-20261013 in the email subject. Do not post confidential customer drawings, proprietary specifications or personal contact details in public comments. Confirm permission and an appropriate private sharing arrangement before providing confidential files.
You may also use the Contact Us page. This guide provides buyer-input questions for a project review; it does not confirm process suitability, a production commitment or a delivery date.