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  5. Pcb Insertion And Extraction Force Elopin Contact Placement

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PCB Insertion and Extraction Force - EloPin Contact Placement

Why push-out force is a critical factor of the press fit assembly process

In demanding applications such as electric vehicles (EVs), aerospace and industrial machinery, the reliability of electrical contacts in PCBs is critical. These applications expose components to vibration, thermal cycling, and mechanical shock that can cause traditional connections to weaken or fail, leading to intermittent signals, increased electrical resistance, or complete circuit failure. PCB verification is required during manufacture to ensure it meets the high standards required by these complex industries.

The EloPin’s high push-out force is important because it ensures a gas-tight and mechanically robust connection. The “cold weld” created during the press-fit process effectively deforms the pin and the PCB’s plated through-hole, this forms a connection that resists loosening. A high push-out force is a measure of the connection’s strength and ability to maintain integrity under extreme forces, preventing failures.

Why push-out force is a critical factor of the press fit assembly process
Measuring pull-out force as part of a press fit inspection regime

Measuring pull-out force as part of a press fit inspection regime

To ensure the press fit pin’s performance, manufacturers perform rigorous quality control tests, the pull-out (or extraction) force is a key metric. A PCB manufacturer is using a Starrett L2 force testing machine, supplied by Optimax, for this test. An EloPin is mounted in a PCB and held in a fixture, a precision grip pulls the press-fit pin out of the hole at a controlled speed. The Starrett L2 machine records the force required to extract the pin, that is compared against strict industry standards. 

This press-fit inspection process ensures that every batch of pins have the mechanical strength to perform reliably. If the pull-out force falls below the specified threshold, it shows a weakness in the press-fit connection, which could lead to failure in the field. This systematic testing is vital to ensure the safety and longevity of the final product, especially in safety-critical applications where a single failure can have severe consequences.

Starrett FMS 500-5000N

We recommend the L2 Systems, which feature a small footprint making them ideal for lean manufacturing environments and as a bonus, no programming experience is required. This is supplied with a purpose designed jig to hold a PCB sample and measure the force needed to insert then extract the pins.Optimax also provided training and support for the operators, wrote the test parameters (which include terminating the test if the insertion force exceeds limits), as this might indicate that the test pins are bent or misaligned. Being automated, the test can be carried out by shopfloor staff not trained in inspection.

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Starrett FMS 500-5000N

The Optimax team with their extensive knowledge and expertise, have proven themselves to be the ideal partner for independent, candid advice. They are a company we can trust to support our metrology and visual inspection needs whether we are purchasing equipment or developing specific metrology instruments for our applications. Their experience and methodical attention to detail mean the outcomes we achieve support our testing requirements.

Dr Andrew Johnson, Assistant Director, RandA

Optimax are a trusted partner! We have been working in partnership with Optimax for several years, to supply us with inspection solutions, service, and onsite calibration to UKAS standards. Their knowledge and expertise is exceptional, they provide honest, independent advice. Optimax are quick to provide options and solutions for our inspection requirements. They work hard to deliver a solution that 100% fits the application rather than just supplying a product. Optimax work with us to ensure we achieve our inspection objectives – they are one of the first companies I turn to.

Bruce Daggett, Senior Aerospace Weston, Inspection Team Leader

For over 14 years Optimax has been providing us with inspection equipment, service and most importantly expertise. We need suppliers that can go the extra mile in looking specifically at our application and then providing a suitable and sometimes bespoke solution, and this is where Optimax have really made a difference

John Harris, Director, Nevo Developments

Optimax have an extensive product range that was very attractive to us. They took the time to understand my requirements and align a solution that fitted into my manufacturing processes. They were very knowledgeable and friendly, I found the virtual demonstration extremely helpful. The outcome of the project has been very successful and performs above expectations. I would definitely recommend Optimax.

Adam Kowalcyck, Quality Engineer, Federal Mogul Coventry

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