10 Questions to Ask Every SPI Vendor Before You Buy
Most SPI sales presentations are polished, optimistic, and carefully designed to avoid difficult topics. These 10 questions cut through the noise — and the answers will tell you more about a vendor than any spec sheet.
Selecting a solder paste inspection system is a seven-to-ten-year commitment. The purchase price is just the beginning. Hidden software fees, proprietary data formats, closed-loop restrictions, and weak support coverage can easily double the real cost of ownership — and none of these risks appear on a vendor's quote sheet.
These 10 questions are designed to surface what vendors won't volunteer. Ask them at every demonstration, with every vendor, before you sign anything. Pay close attention not just to the answers, but to how comfortable the vendor is answering them.
Can you run a Gage R&R study on my boards — not your demo boards?
Why it matters: Measurement repeatability data collected on a vendor's own calibration artifacts or demo boards is nearly meaningless for your production environment. Reflective lead-free paste, fine-pitch pads, and your specific stencil thicknesses create conditions that differ significantly from any controlled demo setup.
A Gage R&R study measures the percentage of variation contributed by the measurement system itself. For SPI, this should be below 10% for volume measurement — measured on your actual production boards.
What to listen for:
A confident vendor will welcome this request and provide raw data. Hesitation, vague commitments to "send something later," or data only from demo conditions is a red flag.
What is your false call rate — in actual production, not in a demo?
Why it matters: A false call is when the system flags a good board as defective. Every false call sends an operator to review a board that doesn't need it — eroding trust in the system and reducing effective throughput. Industry-leading systems achieve below 1% in well-optimized production. Some systems run 5-10% or higher.
The critical distinction: false call rates in live production environments are almost always higher than in vendor demonstrations. Ask for references with similar board complexity and request actual production data, not demo results.
Follow-up question:
"Can you give me contact information for a customer running [your board type] so I can ask them directly?"
Does closed-loop feedback work with any printer brand, or only yours?
Why it matters: Closed-loop printer feedback — where SPI data automatically corrects printer offsets and triggers stencil cleaning — is one of the highest-value features in any SPI system. But some vendors build closed-loop to only work with their own brand of stencil printer, creating a significant lock-in trap.
If you already own DEK, MPM, Ekra, or YAMAHA printers, and the SPI vendor's closed-loop only supports their proprietary printer brand, you are either paying for a feature you cannot use or being pushed toward replacing equipment you did not plan to replace.
⚠ Red flag answer:
"Our closed-loop works best with our [brand] printer." — This is a polite way of saying it works exclusively with their printer.
What software features require annual licensing fees?
Why it matters: The shift to annual software subscriptions has quietly transformed SPI economics. Features that were once included in the purchase price — SPC charting, advanced analytics, closed-loop modules, remote connectivity — are now sold as annual subscriptions by many vendors.
A system priced at $180,000 with $15,000 in annual software fees costs $285,000 over seven years. That same system compared to one priced at $220,000 with all software included is not actually cheaper — it costs $65,000 more over the same period. Always calculate total cost of ownership.
Ask specifically about licensing fees for:
- SPC and process analytics modules
- Closed-loop feedback feature
- Remote monitoring and support access
- IPC-CFX or other connectivity modules
- Software version updates beyond year one
- Additional user licenses or workstation seats
What data formats do you export — and can I access my data without your software?
Why it matters: Your inspection data belongs to you. But proprietary database formats, encrypted data files, or software that only reads vendor-specific formats means you effectively cannot access your own production history without paying the vendor indefinitely.
Open architecture systems store data in SQL databases accessible by standard tools, export to CSV, XML, or JSON without additional fees, and provide documented APIs for integration with MES systems or third-party analytics platforms.
The test question:
"If I stop paying your annual software fee, can I still read 5-year-old inspection data in your database?" A confident vendor with open architecture says yes immediately.
What is your parts availability guarantee and end-of-life policy?
Why it matters: SPI systems run for 8-12 years in most production environments. A system purchased today needs support through the mid-2030s. Projectors, cameras, illumination modules, and motion control components wear out — and sourcing them five years after a platform is discontinued can be expensive, slow, or impossible.
Get specific, written commitments: spare parts availability for at least 7 years after purchase, software updates for at least 5 years, and a documented upgrade path when hardware eventually reaches end-of-life.
⚠ What to watch for:
Vendors with frequent platform changes — new model every 2-3 years — may create parts availability problems faster than you expect. Ask how many systems of this exact model are installed and what the typical production lifespan is.
How long does it take to program a new product — and can I do it offline?
Why it matters: In high-mix environments, programming time is a direct operational cost. If programming a new board takes four hours on the production machine, that machine is not inspecting production boards during that time — an effective throughput loss that rarely appears in vendor TCO calculations.
Target: under 30 minutes for a typical board using Gerber or ODB++ import. Offline programming capability — where you can build and debug programs on a separate workstation without occupying the production system — is essential for any operation running more than a few product changeovers per week.
Demonstration test:
Bring a Gerber file for one of your simpler boards. Time how long it takes the vendor to create a working inspection program from scratch, including pad detection, tolerance setting, and a first-run verification. This is a real test of the software's usability.
What IPC-CFX or SECS/GEM connectivity do you support — and is it included?
Why it matters: IPC-CFX is the electronics industry's standard for connected factory data exchange. SECS/GEM is widely used in semiconductor and advanced manufacturing. If you are investing in smart factory or Industry 4.0 initiatives — or if your customers require it — your inspection system must support these standards.
Some vendors support IPC-CFX in principle but charge a significant annual fee to activate it, or offer only a subset of the standard's message types. Clarify exactly which CFX message types are supported and whether that support is included in the base system price.
Questions to ask:
- Which IPC-CFX message types are implemented?
- Is CFX connectivity included or a separate module?
- Do you have a certified IPC-CFX implementation?
- Can we see a live CFX data stream during the demo?
Who actually installs and supports the system in my region?
Why it matters: The engineer who sells you the system is rarely the engineer who services it. Understand exactly who shows up when something goes wrong: a direct factory-trained technician, a regional distributor's team, or a third-party service contractor. The answer matters significantly for both competency and response time.
Get specifics in writing: guaranteed response time to a critical downtime call, maximum time to have a field engineer on-site, parts depot location and typical lead time for critical components. Vague assurances about "responsive support" are not commitments.
Ask for:
- Name and location of the engineer who will handle your account
- Number of trained service engineers in your region
- SLA terms in writing — not verbal commitments
- Reference from a customer in your region about support experience
Can you show me the 7-year total cost of ownership — in writing?
Why it matters: Purchase price is the least informative number in an SPI evaluation. The 7-year total cost of ownership — which includes service contracts, software licenses, calibration, training, spare parts, and integration costs — is the number that actually determines value.
Ask every vendor to provide a 7-year TCO projection as a formal document, not a verbal estimate. Line items should include: annual software maintenance, service contract (and any escalation clauses), calibration standards replacement, typical spare parts costs, and operator training.
7-Year TCO Comparison Example:
| Cost Component | Vendor A | Vendor B |
|---|---|---|
| Purchase price | $175,000 | $220,000 |
| Annual software fees × 7 | $105,000 | $0 |
| Service contracts × 7 | $87,500 | $77,000 |
| Calibration & consumables | $14,000 | $14,000 |
| 7-Year Total | $381,500 | $311,000 |
The "cheaper" system costs $70,500 more over 7 years.
How Vendors Respond Tells You Everything
These questions are not difficult to answer for a vendor with a strong product and honest sales culture. The goal is not to catch anyone out — it is to separate vendors who are confident in their offering from those who rely on buyers not asking the right questions.
Pay attention to how quickly and completely vendors respond. Defensiveness, evasion, or a pattern of "we'll get back to you on that" responses is meaningful signal. Vendors who answer directly, provide documentation readily, and welcome testing on your actual boards have generally earned that confidence.
Before Your Next Vendor Meeting
Bring to every SPI demonstration:
- Two or three of your actual production boards — including your most challenging one
- A Gerber or ODB++ file for one of those boards
- A list of your current printer brands (to test closed-loop compatibility)
- A list of your MES and factory systems (to test connectivity)
- This question list — and a notepad to record answers
Want a Second Opinion on Your Evaluation?
ASC International's applications engineers are available for unbiased consultations on SPI evaluation criteria. We welcome testing on your boards, comparative analysis, and honest answers to all ten of these questions — including the uncomfortable ones.
Written by
ASC International Team
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