I have a 2.2kw water cooled spindle. It is the standard 80mm round type. My cnc is of the homebrew variety, completely built in structural steel. I'm about to begin the process of filling the tubes with epoxy granite and/or sand. My question is this, if I were to put my spindle into a structural steel tube the length of the body of the spindle, and then fill the tube with epoxy, essentially making my round spindle square while also hopefully dampening vibration, would that cause any unforeseen problems to my spindle.
I have been tossing the idea around in my head for a couple days now, and basically the only thing i could see being a problem is possibly heat, but I dont think the spindle temperature would be enough to cause issues, unless the repeated heating and cooling of the epoxy could cause an issue I am unaware of. Thoughts? Good idea, bad idea?