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Modular PCB Test Fixture

type Bed-of-Nails Functional Tester pogo pins Spring-Loaded Crown Gold Pins cost reduction 95% vs Commercial Fixtures cad SolidWorks 20+ Custom Parts

A modular, cost-effective bed-of-nails PCB test fixture designed to support rapid prototyping and production verification across multiple telematics board revisions. Integrates quick-swap pogo pin plates, cam-lock lever clamping, and balanced spring closure.

How: Modeled in SolidWorks with a removable pogo pin plate and spring-loaded base to accommodate different board sizes. Fabricated the enclosure using 3D printing and Dremeled ABS enclosure. Designed the layout for easy internal wiring access, reducing testing setup time and supporting quick board layout swaps.
How: Modeled in SolidWorks with a removable pogo pin plate and spring-loaded base to accommodate different board sizes. Fabricated the enclosure using 3D printing and Dremeled ABS enclosure. Designed the layout for easy internal wiring access, reducing testing setup time and supporting quick board layout swaps.
How: Modeled in SolidWorks with a removable pogo pin plate and spring-loaded base to accommodate different board sizes. Fabricated the enclosure using 3D printing and Dremeled ABS enclosure. Designed the layout for easy internal wiring access, reducing testing setup time and supporting quick board layout swaps.
• 3D Printed Parts: Printed and tested parts for spring fit, screw alignment, and plate functionality.
• 3D Printed Parts: Printed and tested parts for spring fit, screw alignment, and plate functionality.
• 3D Printed Parts: Printed and tested parts for spring fit, screw alignment, and plate functionality.
• Electronics: First image shows example internal electronics layout. Second shows spring-loaded test probe plate mechanism, with top for PCB support, and bottom for probe alignment, with springs in between.
• Electronics: First image shows example internal electronics layout. Second shows spring-loaded test probe plate mechanism, with top for PCB support, and bottom for probe alignment, with springs in between.
[01/08] How: Modeled in SolidWorks with a removable pogo pin plate and spring-loaded base to accommodate different board sizes. Fabricated the enclosure using 3D printing and Dremeled ABS enclosure. Designed the layout for easy internal wiring access, reducing testing setup time and supporting quick board layout swaps.

01Mechanical Design & CAD Assembly

Comprehensive SolidWorks 3D CAD modeling, multi-body kinematics, tolerance stack-up analysis, and assembly architecture.

01.1 Full Test Fixture Architecture & Enclosure CAD

SolidWorks 3D parametric CAD modeling of the modular testing fixture within an ABS enclosure for rapid, repeatable production validation.

Full Assembly: CAD model of the modular PCB fixture.
Full Assembly: CAD model of the modular PCB fixture.
Full Assembly: CAD model of the modular PCB fixture.
Full Assembly: CAD model of the modular PCB fixture.
[01/04] Full Assembly: CAD model of the modular PCB fixture.

01.2 Multi-Layer Exploded Assembly & Internal Stack-Up

Exploded assembly view showing PCB plate layers, pogo pin alignment arrays, dual-acting hinge, latch release, spring columns, and hardware stack-up.

Assembly Breakdown: Exploded view show PCB plate layers, pogo pin alignment, hinge and lid mechanism, lock and release system, springs, screws, ABS enclosure, and cutouts to illustrate full assembly.
Assembly Breakdown: Exploded view show PCB plate layers, pogo pin alignment, hinge and lid mechanism, lock and release system, springs, screws, ABS enclosure, and cutouts to illustrate full assembly.
Assembly Breakdown: Exploded view show PCB plate layers, pogo pin alignment, hinge and lid mechanism, lock and release system, springs, screws, ABS enclosure, and cutouts to illustrate full assembly.
Assembly Breakdown: Exploded view show PCB plate layers, pogo pin alignment, hinge and lid mechanism, lock and release system, springs, screws, ABS enclosure, and cutouts to illustrate full assembly.
Assembly Breakdown: Exploded view show PCB plate layers, pogo pin alignment, hinge and lid mechanism, lock and release system, springs, screws, ABS enclosure, and cutouts to illustrate full assembly.
[01/05] Assembly Breakdown: Exploded view show PCB plate layers, pogo pin alignment, hinge and lid mechanism, lock and release system, springs, screws, ABS enclosure, and cutouts to illustrate full assembly.

01.3 Parallel-Clamping Lid & Spring Hinge Kinematics

Custom floating hinge mechanism ensuring the lid descends completely parallel onto the PCB surface, preventing uneven probe shear and contact wear.

Lid Mechanism: Lid stops parallel above PCB, leaving a gap to press to PCB down flat onto the pogo pins.
Lid Mechanism: Lid stops parallel above PCB, leaving a gap to press to PCB down flat onto the pogo pins.
Hinge Mechanism: Spring-loaded hinge allows the lid to press down flat and lift automatically when opened.
Hinge Mechanism: Spring-loaded hinge allows the lid to press down flat and lift automatically when opened.
Hinge Mechanism: Spring-loaded hinge allows the lid to press down flat and lift automatically when opened.
Hinge Mechanism: Spring-loaded hinge allows the lid to press down flat and lift automatically when opened.
[01/06] Lid Mechanism: Lid stops parallel above PCB, leaving a gap to press to PCB down flat onto the pogo pins.

01.4 Quick-Release Push-Button Latch Mechanism

Dual spring-loaded latching hooks that snap securely onto chassis retention lips upon lid closure and release instantly via ergonomic side buttons.

Lock Mechanism: Spring-loaded latch locks onto the edge when the lid is pressed down. Pressing the buttons moves the latch off the edge, releasing the lid. Allows for easy PCB mounting onto the test probes.
Lock Mechanism: Spring-loaded latch locks onto the edge when the lid is pressed down. Pressing the buttons moves the latch off the edge, releasing the lid. Allows for easy PCB mounting onto the test probes.
Lock Mechanism: Spring-loaded latch locks onto the edge when the lid is pressed down. Pressing the buttons moves the latch off the edge, releasing the lid. Allows for easy PCB mounting onto the test probes.
[01/03] Lock Mechanism: Spring-loaded latch locks onto the edge when the lid is pressed down. Pressing the buttons moves the latch off the edge, releasing the lid. Allows for easy PCB mounting onto the test probes.

01.5 Swappable Bed-of-Nails Probe Plates & Guides

Two-piece modular cassette architecture: top pressure stubs apply balanced force while the bottom receiver holds spring-loaded pogo pins and guide pins.

• PCB Pin Plates: The top plate has stubs that align with PCB gaps to press it down safely as the lid closes. The bottom plate holds the pogo pins and spring columns. Both plates are swappable for different PCB designs.
• PCB Pin Plates: The top plate has stubs that align with PCB gaps to press it down safely as the lid closes. The bottom plate holds the pogo pins and spring columns. Both plates are swappable for different PCB designs.
• PCB Pin Plates: The top plate has stubs that align with PCB gaps to press it down safely as the lid closes. The bottom plate holds the pogo pins and spring columns. Both plates are swappable for different PCB designs.
• Spring-Loaded Plate: Contoured plate aligns the PCB, with test probe cutouts on a spring-loaded base to reduce pressure on PCB. Swappable for different layouts, making the fixture modular and cost-effective.
• Spring-Loaded Plate: Contoured plate aligns the PCB, with test probe cutouts on a spring-loaded base to reduce pressure on PCB. Swappable for different layouts, making the fixture modular and cost-effective.
• Spring-Loaded Plate: Contoured plate aligns the PCB, with test probe cutouts on a spring-loaded base to reduce pressure on PCB. Swappable for different layouts, making the fixture modular and cost-effective.
[01/06] • PCB Pin Plates: The top plate has stubs that align with PCB gaps to press it down safely as the lid closes. The bottom plate holds the pogo pins and spring columns. Both plates are swappable for different PCB designs.

02Prototyping, 3D Printing & Fabrication

Rapid prototyping iterations, slicing optimization (Bambu Studio / PrusaSlicer), material selection (PLA / PETG / Carbon Fiber), and precision fit checks.

02.1 Rapid 3D Prototyping & Enclosure Machining

High-infill FDM printed chassis frames, latch components, and precision Dremel rotary machining of standard ABS enclosures for button cutouts.

• 3D Printed Parts: Printed and tested parts for spring fit, screw alignment, and plate functionality.
• 3D Printed Parts: Printed and tested parts for spring fit, screw alignment, and plate functionality.
• 3D Printed Parts: Printed and tested parts for spring fit, screw alignment, and plate functionality.
• Dremel & McMaster Carr: Used McMaster for springs and screws, dremeled abs enclosure for buttons.
• Dremel & McMaster Carr: Used McMaster for springs and screws, dremeled abs enclosure for buttons.
[01/05] • 3D Printed Parts: Printed and tested parts for spring fit, screw alignment, and plate functionality.

02.2 Spring Calibration & Carrier Plate Fitment

Calibrating compression springs from McMaster-Carr to dial in the ideal clamping pressure, and verifying slide tolerances of swappable PCB carriers.

• Spring Loaded Parts: Assembled springs into slots to test the hinge and lock mechanism functionality.
• Spring Loaded Parts: Assembled springs into slots to test the hinge and lock mechanism functionality.
• PCB Platform Plate: Inserted printed plates into the ABS enclosure to check fit, alignment, and tolerancing.
• PCB Platform Plate: Inserted printed plates into the ABS enclosure to check fit, alignment, and tolerancing.
[01/04] • Spring Loaded Parts: Assembled springs into slots to test the hinge and lock mechanism functionality.

02.3 Latch Assembly & Pin Push-Plate Installation

Sub-assembly of spring-loaded latch levers, release pushbuttons, and overhead silicone-tipped pressure pins into the ABS lid frame.

• Lid Locking Latch: Tested the spring-loaded latch by inserting screws, nuts, and springs.
• Lid Locking Latch: Tested the spring-loaded latch by inserting screws, nuts, and springs.
• Lid Assembly: Assembled lid with lock latch and pin push plate into ABS lid cover and drilled screw holes.
• Lid Assembly: Assembled lid with lock latch and pin push plate into ABS lid cover and drilled screw holes.
[01/04] • Lid Locking Latch: Tested the spring-loaded latch by inserting screws, nuts, and springs.

02.4 Final Mechanical Integration & Enclosure Assembly

Joining upper lid and base enclosure via stainless steel hinge pins and aligning multi-tier internal electronics mounting studs.

• Fixture Assembly: Assembled body and lid, connected hinge, and assembled into the ABS enclosure.
• Fixture Assembly: Assembled body and lid, connected hinge, and assembled into the ABS enclosure.
[01/02] • Fixture Assembly: Assembled body and lid, connected hinge, and assembled into the ABS enclosure.

02.5 Benchtop PCB Clamping & Dual Unit Validation

Rigorous cycle testing of closing action, pogo pin travel, board retention, and full functional qualification of two manufactured production fixtures.

• Fixture Testing: Tested lid mechanism, PCB mounting, and probe alignment. Built two complete fixtures.
• Fixture Testing: Tested lid mechanism, PCB mounting, and probe alignment. Built two complete fixtures.
• Fixture Testing: Tested lid mechanism, PCB mounting, and probe alignment. Built two complete fixtures.
• Fixture Testing: Tested lid mechanism, PCB mounting, and probe alignment. Built two complete fixtures.
• Fixture Testing: Tested lid mechanism, PCB mounting, and probe alignment. Built two complete fixtures.
[01/05] • Fixture Testing: Tested lid mechanism, PCB mounting, and probe alignment. Built two complete fixtures.

03Electrical, Firmware & Hardware Integration

Schematic capture, PCB routing, sensor interfacing, actuator control, and embedded firmware implementation.

03.1 Internal Electronics Architecture & Spring Probe Bed

Layered internal packaging with dedicated wire routing bays beneath the spring-loaded bed-of-nails probe plate.

• Electronics: First image shows example internal electronics layout. Second shows spring-loaded test probe plate mechanism, with top for PCB support, and bottom for probe alignment, with springs in between.
• Electronics: First image shows example internal electronics layout. Second shows spring-loaded test probe plate mechanism, with top for PCB support, and bottom for probe alignment, with springs in between.
[01/02] • Electronics: First image shows example internal electronics layout. Second shows spring-loaded test probe plate mechanism, with top for PCB support, and bottom for probe alignment, with springs in between.

03.2 Modular Test Probe Array & Signal Routing

High-density gold-plated pogo pin array with custom breakout soldering for modular PCB testing and rapid pin reconfigurability.

• Test Probe Mount: The fixture was designed so only these plates need to be redesigned and swapped for new PCB layouts, keeping it modular and reusable. It has contour inset for PCB mounting and holes for test probes.
• Test Probe Mount: The fixture was designed so only these plates need to be redesigned and swapped for new PCB layouts, keeping it modular and reusable. It has contour inset for PCB mounting and holes for test probes.
• Test Probe Mount: The fixture was designed so only these plates need to be redesigned and swapped for new PCB layouts, keeping it modular and reusable. It has contour inset for PCB mounting and holes for test probes.
• Test Probe Mount: The fixture was designed so only these plates need to be redesigned and swapped for new PCB layouts, keeping it modular and reusable. It has contour inset for PCB mounting and holes for test probes.
[01/04] • Test Probe Mount: The fixture was designed so only these plates need to be redesigned and swapped for new PCB layouts, keeping it modular and reusable. It has contour inset for PCB mounting and holes for test probes.