the surface 65 is in the form of a concave conical surface matingly receiving the convex conical surface 55 the lower extreme surface 66 of the locating element 63 is planar to matchingly engage the planar surface 56 of the locating embossment 51 in operation assuming the machine tool to be in its seated position of fig3 and 4 the first step in indexing the table is to actuate the power actuators 40 to raise the rollers 42 into contact with the undersurface of the gear 15 and then to further actuate the actuators 40 to elevate the gear 15 from contact with the surface 17 of the support table 18 it will be seen that this elevation of the gear 15 will simultaneously elevate the cross member 45 and raise the clamping heads 48 to their positions illustrated in fig5 so that the pallet 16 is no longer clamped to the support 18 this same movement raises each of the spring pressed pins 26 from contact with its abutment 38 allowing the spring 28 to pull the conical pinhead 30 downwardly and into engagement with the conical seat 37 so that the pin 26 interconects the pallet 16 and the gear 15 for comovement under the pressure of the spring 28 since four such pin and spring connections are used a.