The purpose of this paper is to provide a proposal of a production management model using lean manufacturing techniques to improve on-time deliveries of a metal-mechanic company that works in a make-to-order (MTO) manufacture of industrial fans environment. The proposal of the research refers to the implementation of a production management model in a metal mechanic company in Peru and analyze the effect in on-time delivery rate of the company. In one month of operation after the implementation of the pro-posed model, the on-time delivery rate of the company increased from 35% to 80%. Likewise, the problems present in the metalworking research company may be the same in many metalworking companies in the country, so the present investigation will serve as an example for the possible solution of the problems of other companies.