In episode 72 of Hardware Startups with Fexingo, Lucas and Luna dive into the unsung hero of surface-mount assembly: the stencil. They explain how a laser-cut stainless steel sheet—typically 0.004 to 0.006 inches thick—determines whether your boards work first time or fail in the field. Lucas breaks down aperture area ratio rules (must be above 0.66 for good transfer), while Luna shares a cautionary tale about a startup that spec'd a 0.005-inch stencil for 0201 components and saw 30% tombstoning. They cover electropolishing, nano-coatings, and step stencils, and why a $200 stencil can save $20,000 in rework. Perfect for founders moving from prototype to pilot production.

#StencilDesign #SolderPaste #SurfaceMountTechnology #SMTAssembly #PCBAssembly #HardwareStartup #Manufacturing #ElectronicsManufacturing #SolderPasteDeposition #ApertureAreaRatio #Electropolishing #NanoCoating #StepStencil #0201Components #Tombstoning #Business #Technology #FexingoBusiness

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In this episode of Hardware Startups with Fexingo, Lucas and Luna explore wire bonding — the process of making microscopic connections between bare chips and circuit boards using fine aluminum or gold wires. They unpack why chip-on-board (COB) assembly matters for hardware startups building compact, high-reliability products like sensors, wearables, and medical devices. Lucas cites a real-world example: a startup that replaced a bulky connector with wire-bonded dies, cutting package size by 60% and improving thermal performance. Luna asks about the trade-offs — yield risk, rework difficulty, and capital costs. They walk through the two main wire bonding methods (ball bonding and wedge bonding), the role of ultrasonic energy, and key quality metrics like pull strength and bond shear. The episode closes with a practical tip: if you're under 10,000 units per year, wire bonding may not be cost-effective compared to packaged ICs. Perfect for founders, engineers, and anyone curious about how the physical inside of a product gets made.

#WireBonding #ChipOnBoard #HardwareStartups #ElectronicsAssembly #SemiconductorPackaging #Prototyping #Manufacturing #Sensors #Wearables #MedicalDevices #BallBonding #WedgeBonding #UltrasonicWelding #YieldRate #COBAssembly #FexingoBusiness #BusinessPodcast #Technology

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Most hardware startups think solder is solder — but the alloy choice can make or break reliability, cost, and regulatory compliance. Lucas and Luna trace the practical trade-offs between SAC305, SAC105, and the newer low-temperature bismuth-based pastes. They walk through a real case: a smart-sensor startup that switched from SAC305 to a bismuth-tin alloy to avoid warping thin PCBs, saving twenty percent on rework and passing a drop-test they were failing. They also unpack the hidden gotchas: tin whiskers, voiding rates, and why your contract manufacturer might push back on an exotic alloy. If you are shipping hardware into Europe or California, this is the conversation you need to hear.

#LeadFreeSolder #SAC305 #SAC105 #BismuthSolder #HardwareStartups #PCBAssembly #RoHSCompliance #SolderReliability #TinWhiskers #DropTest #ContractManufacturing #Prototyping #ElectronicsManufacturing #SupplyChain #BusinessAndTechnology #FexingoBusiness #HardwarePodcast #BusinessPodcast

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When PCBs get too dense for physical probes, hardware startups turn to boundary scan testing. Lucas and Luna walk through how Joint Test Action Group (JTAG) standards let you test solder joints and interconnects without touching a single pin. They cover the 1149.1 standard, how scan chains work, and why a startup building a 12-layer board saved three months of debug time by catching a hidden via defect. Also: why ad-free listener-supported shows like this one matter for founders who build real things.

#BoundaryScan #JTAG #PCBTesting #HardwareStartups #DFT #IEEE1149_1 #ScanChain #BusFault #SolderJointTesting #DensePCBs #ManufacturingTest #HardwareDebug #StartupEngineering #ElectronicsTesting #FexingoBusiness #BusinessPodcast #BusinessAndTechnology #HardwareStartupsWithFexingo

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In this episode of Hardware Startups with Fexingo, Lucas and Luna dive into vibration testing—a critical but often overlooked step in hardware reliability. They explore how startups like Astro Teller's X division use random vibration profiles to simulate years of shipping damage in hours. Lucas explains the difference between sine sweep and random vibration, the cost of entry-level electrodynamic shakers, and why a failed vibration test at prototype stage is actually good news. Luna shares how a smart-lock startup caught a resonant frequency that would have caused field failures. The conversation touches on MIL-STD-810, HALT/HASS, and the trade-offs between mass production and early-stage testing. A must-listen for hardware founders who want to avoid expensive returns.

#VibrationTesting #HardwareReliability #HALT #HASS #MILSTD810 #ElectrodynamicShaker #SineSweep #RandomVibration #ResonantFrequency #Prototyping #MechanicalEngineering #ProductDevelopment #QualityAssurance #Manufacturing #StartupEngineering #Business #Technology #FexingoBusiness

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In episode 67 of Hardware Startups with Fexingo, Lucas and Luna delve into automated optical inspection (AOI) for verifying solder joint quality on high-density circuit boards. They discuss how a medical device startup reduced field failures by 40% using 3D AOI, the difference between 2D and 3D inspection, and why false positives matter more than catch rate. Lucas explains how AOI systems capture multiple images at different angles and lighting conditions to detect defects like open joints, insufficient solder, and tombstoning. They also cover how startups can decide between inline and offline AOI, and how data from AOI feeds back into the pick-and-place process to improve yield over time. The episode includes a natural mid-show mention of how listener support on Buy Me a Coffee helps keep the podcast ad-free.

#AutomatedOpticalInspection #AOI #SolderJointInspection #HardwareStartup #PCBAssembly #MedicalDeviceStartup #3DAOI #SolderDefects #PickAndPlace #YieldImprovement #DefectDetection #ElectronicsManufacturing #QualityControl #FalsePositives #PCBAssembly #SmartManufacturing #BusinessAndTechnology #FexingoBusiness

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Lucas and Luna explore friction stir welding, a solid-state joining technique that hardware startups are increasingly adopting to create strong, hermetic aluminum enclosures without melting the base metal. Lucas opens with a specific case: a drone startup that switched from epoxy bonding to FSW and cut assembly time by 40 percent while improving waterproofing. Luna asks how the process avoids distortion and why it matters for small-batch production. They discuss the equipment cost (around $50,000 for a CNC retrofit), the learning curve, and the types of products where FSW makes sense — from robotics chassis to LED housings. Lucas shares a tip about using a bobbin tool for thin walls. Luna brings up a real-world quality issue: spiral marks from improper feed rates. They close by connecting FSW to the broader trend of startups bringing production in-house. The donation segment sits naturally between two sub-topics, with the hosts acknowledging the ad-free model and mentioning buy me a coffee dot com slash fexingo.

#FrictionStirWelding #HardwareStartups #AluminumEnclosures #SolidStateJoining #CNC #Drones #RoboticsChassis #LEDHousings #ManufacturingTech #Assembly #Waterproofing #ThermalManagement #BobbinTool #ThinWallWelding #FexingoBusiness #BusinessPodcast #Hardware #Startup

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In this episode of Hardware Startups with Fexingo, Lucas and Luna dive into conformal coating—a thin protective layer applied to printed circuit boards to shield them from moisture, dust, and corrosion. Lucas explains why startups often skip this step to save cost, only to face high failure rates in humid or outdoor environments. He breaks down the three common chemistries: acrylic, urethane, and silicone, and when to use each. Luna shares a story about a small drone startup that lost an entire batch of flight controllers to condensation damage because they opted out of coating. The hosts discuss application methods—spray, dip, and selective robotic coating—and how each scales from prototype to production. They touch on cure times, rework challenges, and inspection under UV light. Listeners will learn one concrete trade-off: acrylic is easiest to rework but offers less chemical resistance, while silicone handles extreme temps but is a nightmare to remove. The episode closes with Lucas noting that a $0.50 coating decision can make or break a product launch.

#ConformalCoating #PCBProtection #HardwareStartups #ManufacturingTech #ElectronicsAssembly #AcrylicCoating #UrethaneCoating #SiliconeCoating #SelectiveCoating #DroneFailure #CondensationDamage #UVInspection #PrototypeToProduction #FexingoBusiness #BusinessPodcast #BusinessAndTechnology #StartupLessons #ProductReliability

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This episode of Hardware Startups with Fexingo dives into in-circuit testing (ICT) — the unsung hero of assembly quality. Lucas and Luna break down how a single ICT fixture can catch soldering defects like cold joints, shorts, and missing components before a board ever gets powered on. They walk through the cost-benefit trade-offs versus flying probe testing, explain why ICT is ideal for high-volume production, and share a real-world example from a medical device startup that caught a faulty capacitor before it reached human trials. If you're building hardware and trying to decide between ICT, flying probe, or functional test — or just wondering why your prototypes work but production units don't — this one's for you.

#InCircuitTesting #ICT #HardwareStartups #PCBAssembly #Manufacturing #QualityControl #FlyingProbeTesting #FunctionalTesting #BedOfNails #DefectDetection #ElectronicsManufacturing #ContractManufacturing #SMTAssembly #TestingStrategy #HardwareEngineering #BusinessAndTechnology #FexingoBusiness #BusinessPodcast

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This episode of Hardware Startups with Fexingo dives into solder paste inspection (SPI) — the unsung quality gate that stops reflow disasters before they happen. Lucas explains how a $50 million IoT sensor startup reduced its field failure rate by 80 percent simply by adding an inline SPI machine to its SMT line. Luna questions whether the investment makes sense for very low-volume prototyping, and they break down the math: at $30,000 for a used system, the breakeven comes after just two avoided board-level rework cycles. They also discuss the difference between 2D and 3D SPI, common false-call pitfalls, and how one startup used SPI data to improve its stencil design iteration speed by 3x. A practical look at why measuring paste volume before reflow is the cheapest insurance a hardware startup can buy.

#SolderPasteInspection #SPI #HardwareStartups #SMT #PCBAssembly #QualityControl #ReflowSoldering #StencilPrinting #DefectPrevention #Manufacturing #Electronics #IoT #LeanManufacturing #SixSigma #ProcessControl #Business #Technology #FexingoBusiness

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