Plastics Guide bush are much softer and less rigid than metals. The sectional shapes and sizes should be carefully chosen in this regard. If needed, a high section modulus can be achieved using principles similar to that used in I-beams and tubes. Curves... morePlastics Guide bush are much softer and less rigid than metals. The sectional shapes and sizes should be carefully chosen in this regard. If needed, a high section modulus can be achieved using principles similar to that used in I-beams and tubes. Curves can be used to stiffen large, flat surfaces. Venetian blinds, for example, have very thin slats that are gently curved despite their rigidity. We will use a garden tractor as an example of a simple design approach by comparing a sheet metal and a plastic hood. By reinforcing with fibers or particles, it is also possible to achieve lightweight and stiff designs.
An individual process for shaping or molding a part is often determined by its overall shape and thickness. When a particular process is selected, the parts and dies should be designed so that they won’t present difficulties in generating the proper shapes, in controlling dimensions, or finishing the surfaces. Since the properties of thermoplastics are not as stiff as metals, dimensional... less
