Abstract: A heat treatment pot for holding molten salts is produced by a spinning process to form the body of the pot from a substantially circular disc blank of heat resisting nickel chromium alloy. In the spinning process, a mandrel is utilized which has a circular end face and an external shape and cross-sectional dimensions complementary to the internal shape and dimensions of said body. The initial diameter of the blank is greater than the diameter of the circular end face of the mandrel by an amount which exceeds at least 90% of the required depth of said body. The blank is applied against the mandrel end face and the spinning process is carried out only to an extent sufficient to bend the blank so as to conform to the shape of the mandrel and to extend the blank along the length of said mandrel for a distance substantially equal to said depth of the body of the pot. The disc blank may be of laminate metal sheet comprising a layer of the nickel chromium alloy clad with a layer of mild steel.

Abstract: The invention concerns a device to be applied to a lathe for spinning, comprising a carriage that is motor driven and movable along guides substantially parallel to the lathe axis, and a tool connected to an arm carried by the said carriage, in which the said tool-bearing arm is pivotally connected on one side to a lever that is manipulated by the operator, and on the other side is linked to a hydraulic cylinder, whose action on the tool is concordant with that of the lever and in which the pressure within a chamber and the outlet of fluid therefrom determine the thrust exerted by the said cylinder on the tool-bearing arm, said lever transmitting the operator effort to the said arm through the sliding piston of a valve which, under said effort, progressively throttles, against the pressure of the incoming fluid, an inlet port coaxial with said piston and communicating with said chamber of said hydraulic cylinder in order to regulate the pressure in said chamber and the outlet of fluid therefrom.