Engineering tool

Anti-Vibration Mount Selector

Most machines that still shake were fitted with mounts that were too stiff — below a frequency ratio of 1.41 a mount amplifies vibration instead of isolating it. Put your numbers in and see where yours sits.

Your machine

Four numbers off the nameplate is all it takes.

Total machine weightkg

Lowest running speedRPM

Use the slowest speed the machine runs at — that is the hardest case to isolate.

Number of mountsoff

Target isolation efficiency

80–90 % suits most industrial machinery. Above 95 % usually needs springs rather than rubber.

Load per mount

125kg

Disturbing frequency

24.0Hz

Required natural freq.

8.7Hz

Required deflection

3.3mm

Achievable with rubber mounts

To reach 85% isolation at 1440 RPM you need a mount that deflects 3.3 mm under a working load of 125 kg. That is well inside the range of a bonded rubber mount — send us these figures and we will confirm the exact part.

What each mount stiffness would actually give you

At 1440 RPM (24.0 Hz). Negative values mean the mount amplifies vibration instead of isolating it.

Static deflection	Natural freq.	Frequency ratio	Result
3 mm	9.1 Hz	2.64	83% isolation
6 mm	6.4 Hz	3.73	92% isolation
10 mm	5.0 Hz	4.82	95% isolation
15 mm	4.1 Hz	5.90	97% isolation
25 mm	3.2 Hz	7.61	98% isolation

How this is calculated. Undamped single-degree-of-freedom model: f_n = 15.76 / √d with d in millimetres, transmissibility T = 1 / |r² − 1| where r = f_d / f_n. Isolation only starts above r = √2 ≈ 1.41. Real mounts have damping, which slightly reduces peak amplification at resonance and slightly reduces isolation above it — so treat these figures as a sound first pass, not a final design.

Send these figures to us Browse all mounts