Calculating force of springs in series

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Question Bruce McCallum 2022/9/2(Fri) 9:25

Hi, I have a number of springs working together in Series and I am struggling to calculate the total forces, I need some help!
Basically I have 3x different stacked springs where they are all at the same F/L but then move together +/-11mm (either in compression or tension but not all at the same time as 2x face one way the other is opposite).
I need to add a 4th spring (always under compression) such that there is always a minimum force of 50N at -11mm travel (assume that 4th spring rate is 4N/mm).
Then calculating out
– minimum force of the 4th spring at -11mm thru to +11 travel
– The total closing force the ‘system’ from -11mm/50N thru +11mm travel

An xlsx based answer would be superb!

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Answer Tokai Spring 2022/9/6(Tue) 11:52

Dear McCallum,

Thank you for your question!
If it is okay for you, could you please send us the layout/sketch of the design that you are considering?
In addition, in the table you provided, the force is 50N at +11mm. However, in your question, the force is 50N at -11mm. Could you explain this as well?

Best regards,
Tokai Spring’s Support Team

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