A part programme is coded using coordinates to give a detailed set of directions to be read by the machine control unit and then followed by the machine tool. When creating a part programme, first of all the programmer must look at a detail drawing to tabulate coordinates and create an operation plan which will include a tool list and materials – this can all be very time consuming and can leave much room for error. Any incorrect code in a programme could lead to errors in the machined component, for example if a datum point is not set in the right place then only part of the component may be drilled/milled in the wrong place; errors in the finished component will mean the entire written programme will have to be thoroughly checked through again, which again is very long and mistakes in the code are not easily identified by the same person who wrote it. If the error is so small the fault in the part made may go unnoticed until put into the final assembly – leading to malfunction. A much more efficient approach to creating a programme would be for the programmer to create a CAD drawing which software such as CIMCO can use to generate a code all by itself. Simulation using CAD can be used for testing a design before letting the programme make it straight away, this makes for less redrafting and delays, therefore saving time. When sent a CAD drawing from a client, it would be quicker to open them using a software – like CIMCO – to generate a tool path for use immediately rather than using the CAD drawing with dimensions to print as a detail drawing to then tabulate etc. Complex shapes and tool paths such as curvy three dimensional designs (for example see figure 1) are much more achievable using 3D modelling because there may be need for more than one tool path at a time which would not be very fun to programme manually. There are some…
A CAD model can quickly display an engineer’s ideas in a realistic way. And those models can be used to generate technical drawings that can communicate the information necessary to make the idea a reality. In order to generate a 3D model, designs must start with sketches that are generated within the CAD program. These computer generated sketches will appear resemble hand drawn sketches in geometry (the combination of points, lines, and shapes), but have big advantages over hand drawn sketches. One important difference between a freehand sketch and a CAD sketch is accuracy. The lines of a CAD sketch can be drawn perfectly straight, with start and end points that occur in exact locations in space. By using numeric (dimensional) constraints a line may also be given precise length, placed a specific distance from another sketch feature, or constrained to be oriented at a specific angle from another straight line. By applying geometric constraints a line can be made perfectly horizontal or vertical. If more than one line is being sketched, they can be made perfectly parallel or perpendicular, collinear, or equal in length. Lines can be constrained to be tangent to circles or arcs, and two circles can be constrained to be concentric. In order to precisely model a part, the designer must be able to use dimensional and geometric constraints within the CAD program.…
____8. .3-D graphics software provides a set of tools for creating ____ that represent three-dimensional objects.…
As you work through the exercises in this activity, pay particular attention to the environment in which you are working. Several CAD tools can be used as sketch tools or features tools, and it is important to understand the difference. For instance, sketch components (such as points or shapes) can be patterned within a sketch. But pattern tools are also available outside of the sketch environment to create patterns of features (such as holes or protrusions).…
• Create 3D CAD models of intended design directions for the creation of prototypes or to…
For the test tube with the ratio of acetylene to air is 1:1, a flame traveled down a test tube, a slight pop and black residue was left…
After completion of this step the architects use the surveying drawing to develop a working drawing for the building. In these drawing you will see triangles, rectangles, squares, arches and other geometry shapes and forms to create their design. The architects through our history have used these shapes to create famous structures all over the world. If you go back to Roman historical sites you will see such examples like the great Coliseum. A great example can be seen is the famous Egyptian pyramid. Some other famous structures are the Eiffel Tower which is in Italy, and Chrysler building in New York. If you look around your neighborhood houses, you will see these shapes.…
* Computer aided design has helped made it faster, the finished design can be seen instantly, changes can be done quickly, accurate, less labour.…
Let me give you an example. Just creating a sheet metal box in the 2D world we would draw up the parts on paper, check our fits and clearances. Everything may look good on paper but you have a thing called human error involved. We might have made a math error or just put down the wrong number on the drawing. That in itself can throw everything off. For one because the prototype shop is going to try and make the parts just the way you have them on the drawing. So if it’s wrong you get the parts back wrong. On the other hand with the help of a good 3D modeling program like Pro/Engineer we can achieve good parts quicker. Let me explain. With Pro/Engineer when you are creating a 3D model, it is created in real space so what you see on the screen is what you are going to get. If you make a change to the model the whole model and drawing changes unlike in the 2D world only the drawing changes. In the 2D world you have to make changes to every drawing. In the 3D world the models are linked to the drawings so if you make a change to the model the drawing also changes. You don’t have to touch the drawings. For…
A few years ago all graphics hardware used a fixed pipeline. Where each vertex and triangle description was passed through pre-programmed components to generate the image on the screen.…
Before CAD was available to mechanical engineers, designers stood at 3x4 foot drawing boards using rulers and compasses to design products. The limitation of working in two…
In this activity you will learn the basic Autodesk® Inventor® software interface and file management. This orientation is important to allow efficient modeling of your own ideas.…
the two others. The aim was to design these three models using CAD (Catia V5,…
Almost all sophisticated graphics systems, including CADD systems andanimation software, use vector graphics. In addition, many printers (PostScriptprinters,…
* Computer-based drafting systems produce the information needed for architects, mechanical designers, and drafts people.…