SCHMIDT® Compliant Pin Assembly
To successfully assemble circuit boards to connector pins, several considerations have to be given. Requirements have to be defined and satisfied in order to minimize defects. 
Suitable Press Types
Typically a pneumatic Direct Acting (with or without monitoring) or a ServoPress is used for this application. The press selection depends on the inspection and monitoring criteria. Press forces typically range from 35 – 200 N / 7 – 45 lbsf per each pin
Process Monitoring
Process monitoring can only detect if one single pin is damaged or not pressed properly in assemblies with very few pins. The damage of a single pin cannot be detected while pressing many pins simultaneously. Monitoring can, however, detect if adequate interference is present, even with a high number of pins. The amount of interference is an indication that the through holes in the PCB are properly soldered. Proper seating and alignment can also be monitored.
Inspection, Measurement Capabilities
- We can reliably inspect for the following:
- Presence of every single pin prior to press cycle (requires servo press or multiple pneumatic presses)
- Presence of every single pin, post-press cycle
- ‘Stick out’ between top of compliant pins & PCB
- ‘Levelness’ of PCB
- Eight of all pins relative to each other
- Board elevation relative to the housing
- Processing of multiple assembly models within one station
Methods for Inspection
- Physical / mechanical dimensional inspection via precision,
low force probes in combination with laser sensor - Measurement via a variety of laser sensors
- Continuity check
- PCB levelness via three or four point inspection
Unless specifically requested by the customer, Schmidt Technology does not apply vision systems for pin inspection and measurement. Schmidt Technology has designed and built assembly cells for a great variety of compliant pin applications and requirements. Please contact us so we may help you determine your specific needs.
