Re: Machine Balance/Rocking Due to Weight Shifting from the Table
Level the machine and adjust the leveling feet to all have the same load on each foot then I think your problem will go away. Depending on the weight of the machine, I normally use a 6 inch square x 3/4 thick chunk of steel as a pad under the feet. Depending on the type of leveling screws I might put a divot in the center of the 6x6 plate with a large drill bit just to keep it centered under the screw.
Worst case, bolt the machine to the floor if there is a provision in the machine base to do that. A standard residential garage floor is not really designed to handle that much concentrated load, but I have had good success with 10,000 lb machines sitting on mine.
Jim Dawson
Sandy, Oregon, USA