I. Six Dimensions of Requirements
There are six dimensions to requirement analysis. Industry experience shows that many purchasing managers immediately ask for a price per meter; however, without knowing your product characteristics, workshop conditions, and capacity planning, any quote provided by the manufacturer is meaningless.
A pre-quote analysis should cover at least six dimensions: Product characteristics (weight, dimensions, material, electrical properties, anti-static requirements); Process cycle time (operation time per station, target line capacity, frequency of product changeovers); Workshop conditions (floor area, ceiling height, column spacing, power supply configuration, existing equipment layout); Expansion planning (product iteration direction over the next three years); Incoming material status (feed direction, dimensional tolerances, surface condition); and Loading/unloading boundaries (equipment placement, entry/exit directions). The more complete the information, the more accurate the quote and the less back-and-forth communication required.
II.
Product and Incoming Materials
Product and incoming material data.
According to industry checklists, workpiece information is the top priority: Drawings and 3D models (3D data plus key 2D dimensional tolerances and the latest version number; STEP, STP, and IGES formats are standard); Physical samples (surface finish, oil residue, burrs, and batch-to-batch variations are only visible on actual samples); Workpiece parameters (material, hardness, maximum dimension list, weight, center of gravity, grippable surfaces, non-contact zones, cavity structures, and fragile areas); Version details (current version and potential future changes); and Incoming material variability (custom equipment must handle actual material fluctuations, not just ideal samples—relying solely on photos of the exterior makes it difficult to create a reliable solution).
The more complete the workpiece information, the better the supplier can determine the loading/unloading methods, fixture designs, and processing steps.
III. Cycle Time and Quality
Cycle time, capacity, and quality targets.
In accordance with industry standards, targets must be quantified: **Takt time**—specify production capacity targets per unit of time (hourly/daily), average vs. peak capacity, and whether production is continuous or intermittent; **Takt requirements**—current takt, target takt, shifts, operating days per week, output volume, seasonal demand, and future expansion plans (clarify if takt is flexible); **Quality control**—key metrics such as dimensional tolerances (e.g., ±0.01 mm), appearance defects (no scratches or deformation), performance parameters (e.g., tensile strength ≥50 N), and inspection methods (visual/manual); **Yield targets**—specific target yield rates rather than rough estimates—quantifying takt, capacity, yield, precision, and labor requirements allows for the subsequent assessment of equipment compliance.
IV. Site and Interfaces
Site interfaces and expansion planning.
Based on industry checklists, the “five-piece set” of site data includes: **Workshop layout**—current equipment layout, locations of columns and aisles, and personnel/vehicle traffic flows;
**Site parameters**—ceiling height, floor load-bearing capacity, pits, ramps, and forklift routes; **Utilities**—power specifications, compressed air supply, network interfaces, exhaust systems, and MES/ERP integration requirements; **Upstream/downstream interfaces**—communication protocols of existing production lines, cycle times of upstream/downstream equipment, start/stop logic, signal points, and rules for emergency shutdowns; **Expansion planning**—future product iteration and changeover requirements (many projects stall later due to unresolved site and interface issues)—manufacturers of large-scale production lines typically conduct on-site surveys to measure dimensions and verify power, air supply, and environmental conditions, thereby preventing installation or compatibility problems down the line.
V.
Budget and Acceptance
Budget, acceptance criteria, and five categories of information.
In line with industry practice, clarify five categories of information before requesting a quote: **Current Status** (existing processes, labor pain points, historical failure points, operation videos); **Objectives** (cycle time, capacity, yield, precision, and labor reduction targets—all quantified); **Product** (drawings, samples, and incoming material condition); **Site** (placement location, loading/unloading direction, and spatial boundaries); and **Acceptance** (acceptance criteria and judgment methods agreed upon in advance). Also, define the **Budget Range** (even without sharing the full budget, a rough range keeps the proposal on track) and identify **Uncertain Parameters** (mark them as “to be confirmed” and discuss with the vendor rather than ignoring them). In the RFQ, list unknown items as “to be confirmed” instead of guessing numbers; preliminary data serves only for directional discussion before specifications are finalized, with the ultimate agreement based on mutually confirmed drawings and technical protocols.
The completeness of the provided data directly determines the reliability of the quote and the amount of rework required.
Conclusion
What information is needed for a quote on a custom assembly line? The conclusion is “digitization across five categories: product, cycle time, quality, site, and budget.” **Product:** 3D drawings, physical samples, material/dimensions/weight/center of gravity, clampable/non-contact surfaces, and incoming material variability. **Cycle Time:** Hourly/daily capacity targets, average vs. peak rates, shift patterns and changeover frequency, and future expansion plans. **Quality:** Dimensional tolerances, visual defect standards, performance parameters, inspection methods, and target yield. **Site:** Workshop floor plan, ceiling height and floor load capacity, power/air/exhaust utilities, upstream/downstream interfaces, and expansion plans. **Budget & Acceptance:** Budget range, acceptance criteria, and judgment methods. Regarding the five categories—current status, objectives, product, site, and acceptance—mark uncertain parameters as “to be confirmed” rather than guessing.
Industry convention dictates that a quote request for a custom assembly line is not merely an inquiry but a comprehensive briefing: by fully completing the process parameter table, capacity requirement table, and site interface table, a manufacturer can provide a reliable proposal within a week, cutting rework in half.
