I have an RF-45 type machine on the way (BF46 Optimum), and am in process of designing a heavy stand for it. Is it preferable to attach the mill solidly to the stand, steel on iron, or should there be some sort of isolation pads between the two? I was thinking that a solid connection would help to add some more effective mass to the mill, and if that were the case, then I'd probably fill the stand (box section steel) with sand or concrete to add more mass yet. The stand would then have isolation pads between it and the floor, as well as leveling feet.

Thanks,
-Steve