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Southern Manufacturing

Farnborough, Hants(GU14 6TQ)

20/04/2021 - 22/04/2021

Southern Manufacturing and Electronics is the most comprehensive annual industrial exhibition in the (more)

PPMA Show 2021

NEC, Birmingham(B40 1NT)

28/09/2021 - 30/09/2021

PPMA Show 2021 will be the UK’s largest ever event dedicated to state-of-the-art processing and (more)

Advanced Engineering 2021

NEC Birmingham(B40 1NT)

03/11/2021 - 04/11/2021

Join us in our 12th and most important edition to date, as we invite engineers and management from all (more)

Machined spring provides required accuracy and life

Machined spring provides required accuracy and life Whilst recently providing a product demonstration of the unique capabilities of the machined spring product, the experts at Abssac were asked an interesting  question: "Would you be able to retrofit a spring now being used as a buffer spring in a fuel control system?"

The spring unit should compress and extend 2mm but deliver an accurate spring rate over a set lifetime. The current wire wound spring was not providing an accurate spring rate over time and each spring had to be rate tested and certified before fitting. Normal rate accuracies were ranging from ±15% and were not linear in rate.
The machined spring, as the name suggests, is machined from a single piece of material. This not only allows one, two, three or more spring elements to be machined into the single part but, due to the geometry of the coil, the spring rate is totally linear. In fact spring rate tolerance can be as good as ±1% if required with the machined spring.

After the preliminary discussion between the customer and an Abssac application engineer, a drawing of  the concept spring was forwarded to be reviewed. A few minor changes were then needed, as the customer engineer looked into incorporating attachment designs into the single piece stainless steel spring. All other dynamic parameters could be improved on over the wire wound spring being used and a final configuration was then proposed.

Two test samples were sent to verify the installation and complete life testing. The machined spring supplied improved efficiency of the application, reduced parts inventory and each spring supplied was certified on rate so could be fitted straight into the application.

Solving this project has led to several other spring applications of the same physical configurations, but with varying spring rates and materials.
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