Your phone rings. A potential customer needs a quote by end of day for a part they haven’t designed yet. They describe the function, rough dimensions, material preference, and a few critical tolerances. No CAD file. No 2D drawing. Just a conversation and a deadline.
If you quote too high, you lose the job. Too low, you bleed margin on unknowns. Most shops either guess and hope, or stall until a drawing arrives — losing the customer to a competitor who answered faster.
There is a middle ground. Shops that consistently win early-stage work use a structured approach to quote parts that don’t exist yet. Here is how to build one.
Start With a Structured Intake, Not a Conversation
Ad-hoc phone calls and email threads miss details. Create a standard intake form or checklist that captures the minimum information needed for a preliminary quote:
- Function and load requirements
- Envelope dimensions and weight limits
- Material family (e.g., 6061 aluminum, 316 stainless, PA12 nylon)
- Critical tolerances and datums
- Surface finish or coating needs
- Annual volume forecast and batch sizes
- Target lead time
- Any secondary operations (heat treat, assembly, inspection)
Make this form part of your RFQ process. When a customer calls without a drawing, you fill it out together. The act of completing it forces both sides to surface assumptions early.
Define Your Process Envelope for Each Capability
You cannot quote what you haven’t bounded. For every machine and process in your shop, document the practical limits:
- Maximum build envelope or travel
- Achievable tolerances by feature type (hole, slot, profile, flatness)
- Minimum wall thickness, draft angles, fillet radii
- Standard vs. premium surface finishes
- Typical lead times at current capacity
This is your process envelope. When the intake form shows a requirement outside the envelope, you know immediately — before any math — that the job needs a process change, outsourcing, or a no-quote.
Build Parametric Cost Models, Not One-Off Spreadsheets
Spreadsheets rot. They hide assumptions, break when rows shift, and cannot be audited. Instead, build parametric models tied to your process envelope:
- Material cost by alloy and stock form (bar, plate, powder, filament)
- Machine time per feature type (roughing, finishing, drilling, tapping)
- Setup time by fixture complexity
- Tooling amortization rules
- Secondary op cost libraries (anodizing, heat treat, CMM inspection)
- Overhead recovery rates by work center
When the intake form is complete, the model outputs a price range — not a single number — based on the uncertainty level of each input.
Quote a Range With Explicit Assumptions
Never send a single price for an undefined part. Send a structured quote that states:
- Price range (e.g., $4,200–$5,800 per unit at 50 EAU)
- Key assumptions driving the range (material grade, tolerance band, setup complexity)
- What would narrow the range (final CAD, tolerance stack review, DFM session)
- Validity period (typically 14–30 days)
- Next steps and owner
This shifts the conversation from “is this price right?” to “which assumptions need resolving?” The customer becomes a partner in de-risking the quote.
Attach a DFM Checklist to Every Preliminary Quote
Design for Manufacturability feedback is your highest-leverage activity on undefined parts. Include a lightweight DFM checklist with every preliminary quote:
- Features that exceed process envelope
- Tolerances that add cost without function
- Material substitutions that reduce cost or lead time
- Consolidation opportunities (multi-part to single-part)
- Standard hardware vs. custom machined features
This does two things: it demonstrates expertise before the customer commits, and it creates a natural reason for a follow-up meeting — the “DFM review” — where the real quoting happens.
Track Conversion From Preliminary to Production
You cannot improve what you do not measure. Tag every preliminary quote in your system and track:
- Preliminary-to-final quote conversion rate
- Average price change from range midpoint to final PO
- Time from preliminary quote to drawing receipt
- Win rate vs. shops that require drawings first
Over time, this data calibrates your parametric models and tells you which customers are worth the early investment.
Automate the Workflow So It Scales
The framework above works for one estimator. It breaks at five. The shops that scale this capability embed it in software:
- Intake forms that feed parametric models directly
- Process envelopes stored as rules, not tribal knowledge
- Automatic range generation with assumption tracking
- DFM checklists generated from feature recognition
- Conversion dashboards visible to sales and operations
Solvi combines instant quoting, MES workflow automation, and a job board so digital manufacturers can operationalize this exact process — turning undefined RFQs into profitable production jobs without adding headcount.
Conclusion
Quoting parts that don’t exist yet is not guessing. It is a disciplined process: structured intake, bounded process knowledge, parametric models, explicit ranges, DFM partnership, and measured conversion. Shops that master it win the early conversation, shape the design, and capture the production order.
Ready to stop guessing and start quoting earlier? See how Solvi helps digital manufacturers quote undefined parts with confidence.