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Started this vibration free platform project over the winter. Took time for everything to arrive, and also got tied up with school, but never the less, I finally finished it up and wanted to share.
In addition to using a 90 lb, 24x24x6 butcher block, I glued a 40 lb 1/4 inch steel plate to the butcher block to give it the extra weight needed to reduce/resist the vibration, and to also assure it had that "Sweet Spot" all over.
From experimenting with a standard everlast, adding weight on top, it seemed that the minimum weight needed to make a platform vibration free was 100 lbs. This was of course in addition to it already being attached to a strong supporting structure.
The stock PF 400 came with only (2) 1.25 inch support angles. This, I didnt think would be enough to support the Butcher Block and steel plate (130lbs), so I went to a metal shop and had (2) additional angle supports made, but made them 1.5 inches instead, and attached them to the two outside vertical bars of the cage.
To my suprise, there still was a minimum amount of vibration. It seemed the source was the two white round vertical supports that the cage slides on. They are 4 feet long and only supported at the very top and bottom. To rectify this, I added another horizontal support bar right in the middle. Securing it on both sides. One side had a 1.5 steel plate with 1/4 bolts going through to a 2x4 with t-nuts on the back. This got rid of that slight vibration, and also left no restrictions on the movement of the cage up and down.
Also on the stock platform it has a huge space between the back of the platform and the cage(see pic). I did not find this to be ideal to resist vibration. When I modified it, I only left a 1 inch space. An example of how the spacing effects the vibration factor, is if you take two decent size dumbells and hold your arms all the way out, your arms will start to shake, but if you pull your arms in close to your chest, you will have much better support.
Below are some before and after pics.
In addition to using a 90 lb, 24x24x6 butcher block, I glued a 40 lb 1/4 inch steel plate to the butcher block to give it the extra weight needed to reduce/resist the vibration, and to also assure it had that "Sweet Spot" all over.
From experimenting with a standard everlast, adding weight on top, it seemed that the minimum weight needed to make a platform vibration free was 100 lbs. This was of course in addition to it already being attached to a strong supporting structure.
The stock PF 400 came with only (2) 1.25 inch support angles. This, I didnt think would be enough to support the Butcher Block and steel plate (130lbs), so I went to a metal shop and had (2) additional angle supports made, but made them 1.5 inches instead, and attached them to the two outside vertical bars of the cage.
To my suprise, there still was a minimum amount of vibration. It seemed the source was the two white round vertical supports that the cage slides on. They are 4 feet long and only supported at the very top and bottom. To rectify this, I added another horizontal support bar right in the middle. Securing it on both sides. One side had a 1.5 steel plate with 1/4 bolts going through to a 2x4 with t-nuts on the back. This got rid of that slight vibration, and also left no restrictions on the movement of the cage up and down.
Also on the stock platform it has a huge space between the back of the platform and the cage(see pic). I did not find this to be ideal to resist vibration. When I modified it, I only left a 1 inch space. An example of how the spacing effects the vibration factor, is if you take two decent size dumbells and hold your arms all the way out, your arms will start to shake, but if you pull your arms in close to your chest, you will have much better support.
Below are some before and after pics.
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