... oil cylinders, to realize the synchronizing movements of the ram ( Y1, Y2), and keep the worktable always in parallel situation.Introduction of ... crowning of worktable3 + 1 axis: Y1, Y2, X, W/V4 + 1 axis: Y1, Y2, X, R, V6 + 1 axis: Y1, Y2, X, R, Z1, Z2, V8 ... + 1 axis: Y1, Y2, X1, X2, R1, R2 ...