St. Paul, MN (PRWEB) May 01, 2013
Despite the ever-growing popularity of NMR Technology, many (or even most) engineers have not heard of NMR yet. Since that is the case, sales engineers at Envision Plastic have to take the time to explain what NMR is, how it works, what its limitations are, and select design parameters. Understanding and utilizing NMR Technology is not “rocket science.” The concept of fabricating plastic sheet, using tongue and groove construction, and solvent welding components together can be quickly understood by any mechanical design engineer with experience in metal fabrication or even woodworking.
The first step in the NMR fabrication process is CNC routing. Envision routers the enclosure (and its components) in the flat. The holes, cutouts, and recesses are applied during the milling process.
After routing, the parts are moved to the sawing stage. Here, the parts are given a 45 deg. miter on the underside of the part. This serves as a controlled bend location. Material is removed in this fashion in order to hold tighter tolerances during the bending process. Prior to bending, the parts may go through another operation called faceting. During this stage, the parts are deburred, chamfered, or radiused on the edges for a better aesthetic look. Like with milling, the bending process is CNC controlled. A complex forming machine made specifically for NMR allows us to hold tight tolerance angles to complete the forming process of plastic housings. Finally, the parts are ready for assembly in the bonding department. Here, component parts are solvent welded together and bend joints are welded to give the part additional structural integrity.
It is often asked how detailed drawings need to be when submitted for quotation or further analysis. It is not expected that customers submit drawing files of plastic housings with full detail of tongues, grooves, etc. using NMR Technology. Envision expects to fill in details, answer questions, and educate customers as to the best technique of design for both cost and functionality. Despite this, the more information about the plastic housing, the easier the transition from concept to manufacturing.
As stated in the title, this is a multi-part series detailing the design criteria for the NMR Technology. In this series, more will be described about materials, dos and don’ts, and even some case studies on how NMR Technology has been applied to other customer applications.