Three dimensional (3D) CAD (computer-aided-design) models have enabled major productivity gains in product design and engineering. Prior to the advent of economical desktop computers skilled draftsmen spent hours laboring with graphite lead pencils on velum and Mylar to achieve engineering quality documentation for fabrication and production manufacturing. The process required tedious checking to eliminate errors wherein modification required erasures and redrawing over and over on the same sheet. Large projects had many drawing documents linked to one another that required procedural revisions and archiving.

Two dimensional (2D) CAD (computer-aided-design) was a great step forward in moving from the drafting table to the desktop computer. The graphical display capabilities of the desktop computer enabled a user to graphically draft using mouse, keyboard strokes, text line commands, and tablet with stylus. Each CAD system had its own (UI) User Interface. While manual drafting may have actually been faster in the early years, two dimensional (2D) CAD (computer-aided-design) technologies allowed endless changes to be made with sharp clean printed copies printed without limitation. It was easy to export the CAD drawings in PDF format for viewing and printing on any non-licensed computer.

Injection molding of plastics is one of the most cost effective processes for manufacture of parts in volume. While mold costs can be significant, amortization over many parts can make the overall cost of injection molding highly competitive with other manufacturing processes. The wide range of available polymers multiplied by the huge array of specific blends offer a tremendous range of physical, thermal, electrical, and chemical properties. Engineering plastics, classified by mechanical properties such as stiffness, toughness, and low creep, increasingly replace metals on a cost and performance evaluation.

Designing for injection molded plastics requires planning. Too often parts will be presented to a molder or tool designer late in the product development process only to be confronted with feasibility issues. If that happens the developer faces decisions to rework part designs or to face higher tooling and part costs. Leaving design for manufacturing and assembly (DMFA) considerations until late in the development program is a common mistake the misses out on optimization and disrupts the transition to manufacturing.

Planning begins in preliminary design. Some will argue that consideration for manufacturing early in the program will inhibit creativity; the reality is that it does not if perspectives are kept in balance. In fact design committee often err in committing to a design that later reveals feasibility and cost issues. While designers and engineers need to be free to brainstorm potential solutions, taking time to evaluate for manufacturing options is vital to assume a successful program. http://www.cadmodels.biz/3d_cad_design_for_injection_molded_plastics.html

As with all modern scientific and technological endeavors, computers, software and internet tools play an increasingly important role. As well as the typical business application software there are a number of computer aided applications specifically for engineering. Computers can be used to generate models of fundamental physical processes, which can be solved using numerical methods.

A number of decisions have to be made which directly affect the product's overall and total cost. One of the first decisions that has to be made deals with the initial design. At one time, engineers had to convert from manual design and drafting on a drawing board to 2D CAD. Now we are starting to see a new shift in the field cad design. Within the past decade, the engineering, design and drafting world has been experiencing a shift from 2d to 3d cad. Many inventors and companies still use 2d drawings and are starting to realize the benefit of skipping the 2d step and starting off with a 3d design because 3d modeling can save time and money as well as improve customer relations. This article will explain why inventors should take 3d cad into strong consideration.

These types of transitions occur from time to time and are completely normal. Many engineers will argue with these facts because only about 50% of the engineers out there use 3d modeling software, but the fact still remains that 3d cad models can save time and money in the long run and there are many facts that prove that the assumption that the use of 2d cad drawings is inexpensive is simply a myth.

The truth is that making 2d drawings is fast and easy, but the output is still a 2D drawing, which does not readily work with downstream systems like purchasing and manufacturing. In some cases 2d drawings are sufficient but 90% of the time they are not. In prototyping, for example, a 3d model has to be made because most of the prototyping machines require 3d data. In fact, the majority of the machines used to manufacture parts need 3d cad files and do not read 2d cad drawings because 2d drawings do not contain all information needed to develop a three-dimensional product. http://cadmodels.info/