With the free distribution of instructions showing how to manufacture plastic contact lenses, demand for Levin equipment described in the instruction booklet increased rapidly. The company responded to the demand by designing and producing machines specifically designed to cut and polish plastic contact lenses and provided instruction and training in the use of their products. Years later, these same machines were modified by others to enable them to machine sections of a frozen cornea. For a while, this became an accepted means to correct certain vision problems. The surgical procedure was referred to as "Radial Keratotomy" and was described in the news media at the time, along with pictures of the Levin equipment used for that application. Ultimately, this surgical procedure was replaced by a different surgical procedure.

Over time, designs and manufacturing methods changed to meet or exceed the increasingly tight tolerances required by industry. While the size of parts used in watches had gradually been decreasing, the industrial requirement to produce large quantities of even smaller, more precise and more difficult to produce parts was increasing. The company produced a special lathe having a headstock spindle error of less than 10 millionths of an inch. Today, that may not seem to be such an achievement; but at the time it was an extremely difficult task. This lathe was ordered by the U.S. Government through the normal competative bidding process. The bid requirements specified that the maximum allowable spindle error was not to exceed 10 millionths of an inch when tested using the method specified by the Government and the test equipment provided by the Government. The equipment and measuring techniques employed were the most accurate known at that time. What this meant was that if one placed a perfectly spherical ball in the spindle and then started the spindle rotating, a sensitive indicator measuring that ball anywhere on the ball would not indicate an error exceeding 0.0000010" when one took the difference between the maximum reading and the minimum reading. Some idea of the difficulty of producing such a machine might be gained by knowing that Louis Levin & Son, Inc. was the only company in the United States to submit an unqualified bid. The geometric problems associated with building such a ball bearing spindle assembly were extremely complex and inspection equipment with the necessary sensitivity to accurately measure such errors had not as yet been invented. Moreover, the "master test ball" provided by the Government was not perfectly spherical. But using techniques passed down from the two preceding generations of Levins, Robert had the lathe constructed and he personally inspected and assembled and fitted each individual part.

When checked by the Government laboratory that ordered the machine, they advised Louis Levin & Son, Inc. that it met and exceeded all of the Government specifications. In fact, they advised that they were unable to detect any error whatsoever in the rotational accuracy of the headstock spindle. Some months later, however, they advised the factory that they finally succeeded in detecting an error in the spindle rotation. That error was stated to be well under 1 millionth of an inch, total indicator reading. When asked how they accomplished this feat of measurement, they replied that they invented and produced an "optical" measuring system for just that purpose. However, further inquiries disclosed that that the accuracy of their "optical" system could not be verified because no sufficiently accurate comparison standards were then available.

Louis Levin & Son produced special machines to micro-drill very small diameter holes of exceptional length and concentricity. One application was for a machine to drill a hole 0.013" diameter down the center of a 4 inch long, 5/16" diameter 416 Stainless Steel part. In this case, the hole had to be drilled from both ends, intersecting in the center. In terms of both the size and precision, industrial requirements now greatly exceeded anything demanded by horologists. The aerospace and electronics industries demand for equipment of the highest possible precision to produce the smallest of parts pushed the factory into the production of many special machine tools and components.

In December of 1962, Samuel Levin passed away quite unexpectedly. His son, Robert, assumed most of the administrative and operational responsibilities of the corporation. It was a difficult time. Robert now had the responsibility of taking care of his family, which now had 5 children, his mother, and Louis Levin & Son, Inc. Customers, employees, and family members were concerned about their future. Louis and Robert offered Donald Jaffe, the husband of Louis's granddaughter Sylvia, the position of Treasurer. Donald was then an experienced C.P.A. He accepted the offer and continued in that position until 2 years after the firm was purchased by the G. L. Ohrstrom Company, of New York.

During the years that Robert directed the company, each of his 5 children, Nina, Robyn, Erik, Alison, and Michele had the opportunity to work in the factory during their school vacation periods. By the time the company was sold in 1984, all of Robert's children had worked in the company at one time. Bob's wife Renee, had also been employed to assemble electronic control units. It was truly a family business both in terms of the family members who had managed and worked there as well as with a great many of the non-family members who worked there.

In 1966, Louis Levin & Son, Inc. and the Tsugami Manfacturing Company of Japan entered into an agreement to introduce a new type of internal/external cylindrical grinder to the U.S. market. This machine was based upon a current model being produced by Tsugami; but contained Levin designed modifications that enabled the machine to grind smaller, more precise parts than had been possible previously. Production grinding of parts having diameters as small as 40 millionths of an inch became feasible. Levin spindle assemblies that turned round within less than 1 millionth of an inch, were being used in production machining and inspection applications. The industrial demand for Levin machine tools, machine tool component assemblies and tooling continued to increase while the demand for lathes and tools for the watchmaker and horologist had virtually disappeared. Toward the end of the 1970's Louis Levin & Son, Inc. was producing lathes as fast as it could. Shortages of specially manufactured bearings and other items began to limit lathe production and the increasing demand for such equipment by the U.S. Government and its contractors only made matters worse. The company was shipping its products all over the world.