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Great! Once you pour, keep it wet for as long as you can. Concrete continues to build strength for as long as a year if it stays wet. I spray water on it and cover it with polyethylene sheets. Keeping it wet initially cuts down on the shrinkage, and reduces the tendency to crack. I try for at...

My rule of thumb is that you want the base to weigh significantly more than the installed machine. That forces (pun intended) the vibrational energy to be absorbed in the absorbers. If the base is too light, it becomes a transducer for the vibrations. I agree with @Ray70's advice above. If you...

There are also Fastenal and McMaster as possible sources; sometimes more expensive, sometimes not. I bought a monster bag of the captive nuts off eBay when a computer rack company shutdown. I bought stainless rivet nuts for a couple of what I thought were awkward locations. I have been shifting...