Sim Rig Anti Vibration Feet

Having installed 200 watts worth of bass shaker I felt it was time to do some proper isolation of the vibrations. Originally, I had designed some 3D printable feet out of TPU but over time they had become crushed. They were also a prototype and they didn’t bolt to the rig securely so it was a job that had been nagging at me for some time.

Inspiration

I spent some time looking at designs on the web. In the past I had hung some turntables that were sat on paving slabs from Yoke style (far left) suspension mounts but as I looked around the web I saw there were other possible designs. I thought about designing one that used a spring because this would be most like car suspension.

Then eventually I reached out to a company with the following question:

Hi,
I have a sim-racing rig which weighs about 250kg including me. It is constructed from Aluminium Extrusion and vibrates due to a 25NM Servo Wheel Base and 4 x 50W Bass Shakers. The known vibrations range from 20Hz to 100Hz but could be higher.
I’d like to mount it on anti vibration mounts and am looking for the best cost effective solution.

I also included a photo of a prelimary design.

I was really please to receive a response super quickley that included some real science.

For this type of application I would normally propose something like the Triflex mounts MTG1086 (Editor – 3rd image from left) however these are more costly.

A lower cost alternative which you could trial is using buffers (Editor – right image), these would depend on any sideways load as they are soft in this direction. They would also only be suitable for a static application as they are not captive so could not be on a mobile vehicle for example.

If we consider a disturbing frequency of 20Hz (1200cpm) then we would need around 2.5mm static deflection on the mounts to provide some isolation. Considering the 250kg equally loaded over 4 mounts gives 613N per mount. Based on this you I propose you could trial GMT buffers A50/40M10*28-43 which will deflect around 4mm under the 613N load and provide in the region of 80% isolation against a disturbing frequency of 1200rpm.

I was super grateful for the explanation and the included spec sheet which told me that the recommended dampers were 43 Shore Hardness aka Soft. At the time I had already sourced some dampers that were M8 – 40mm x 30mm but with a Shore Hardness of 57 aka Medium.

The early doors feedback from the wife whose office space is below the rig is that “The rig is definitely quieter with the new shoes”. I have included a video at the bottom of the page if you want to see the feet in action.

Design

Other than some M8 bolts, nuts and t-nuts there are only three parts to the design:

  1. The rubber damper – I used M8 – 40mm x 30mm with females both sides.
  2. The 3D printed foot.
  3. The 5mm aluminum plate.

You can download the designs for part 2 & 3 here.

What’s Next

I’d like to find some softer rubber dampers and try them. The rest of the design is great and allows for easy swapping of the rubber elements so I don’t feel I need to make any changes there. I might look for male > female dampers as it would be nice to use the male end to give a small amount of levelling as well.

The Video

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