Solved Application Story # 74: Protecting Circuit Boards from Extreme Vibration

flexure used to protect circuit boards from vibration

The Challenge

A customer was using rigidly mounted circuit boards that were cracking from extreme vibrations. A device to keep electrical contact and a method to absorb the vibration was needed. The boards were in a fluid environment allowing for damping to the system. The spring must be flexible in bending and axial movements. Could Helical solve the situation?

helical machined spring flexure

The Solution

During discussions with the customer, different attachment ideas and materials were suggested—brass or aluminum were the customer’s first choices. The tightening torque for securing a nut was to be 12 lb/in. After sketches were sent back and forth, samples were sent for test and evaluation. This particular application called for a material not normally used by Helical—copper impregnated with aluminum (Glidcop, AL60). After a long test and evaluation program, the proposed spring was approved and production started.

Machined Springs

The most demanding compression, torsion, and lateral spring applications can benefit from the HELI-CAL flexure concept.  Overall system designs can be enhanced because flexures increase precision, require less space, and reduce costs.

The integration of flanges, geometric shapes (squares, hexes, rounds, etc.), bearing seats, valve seats, gears, splines, bell-crank arms, internal and external threads, and other machinable shapes is available to the machine spring designer. The incorporation of these features into a single piece solution reduces the number of parts needed in an assembly and simplifies installation. In the case of torsion springs, integrated attachment features enable the transmission of a pure moment which avoids many of the drawbacks of traditional wire-wound springs.

machined springs

For more than 50 years Helical Products Company has been providing machined spring solutions to such industries as Aerospace/Aviation, Medical tools, and equipment, Military, Energy as well as computer and semiconductor manufacturing. 

We are honored to serve as a manufacturer’s representative for Helical.