Throughout the time of this “industrial revolution” to the present times, quality-built machine tools have always been expensive. The owners of shops, both large and small, had to carefully consider the prospect of such large capital outlays before issuing a purchase order. In economic jargon, machine tools fall under the heading of durable goods. When these purchases are made properly, these tools and their operators make substantial sums of money for the companies they work for. It is, therefore, a great concern to company owners when a machine tool begins to wear out or fall out of tolerance with regard to the jobs that it is being required to produce.