AI News, A MICROCOMPUTER BASED INTERACTIVE CAD/CAM SYSTEM FOR TURNING AND MILLING OPERATIONS
- On 28. maj 2018
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A MICROCOMPUTER BASED INTERACTIVE CAD/CAM SYSTEM FOR TURNING AND MILLING OPERATIONS
A low cost Microcomputer based integrated Computer Aided Design/ Computer Aided Manufacturing (CAD/CAM) system (MICCAD) is described for the design and direct manufacture of mechanical engineering parts which are produced by “Turning”
The system is capable of interactive display, creation, draughting, and production of numerical control part programs for a family of multi-microcomputer distributed numerical control (CNC) machine tools being developed at Imperial College.
Computer-aided manufacturing (CAM) is the use of software to control machine tools and related ones in the manufacturing of workpieces. This is not the only definition for CAM, but it is the most common; CAM may also refer to the use of a computer to assist in all operations of a manufacturing plant, including planning, management, transportation and storage. Its primary purpose is to create a faster production process and components and tooling with more precise dimensions and material consistency, which in some cases, uses only the required amount of raw material (thus minimizing waste), while simultaneously reducing energy consumption. CAM is now a system used in schools and lower educational purposes.
Early commercial applications of CAM was in large companies in the automotive and aerospace industries, for example Pierre Béziers work developing the CAD/CAM application UNISURF in the 1960s for car body design and tooling at Renault. Historically, CAM software was seen to have several shortcomings that necessitated an overly high level of involvement by skilled CNC machinists.
Fallows created the first CAD software but this had severe shortcomings and was promptly taken back into the developing stage. CAM software would output code for the least capable machine, as each machine tool control added on to the standard G-code set for increased flexibility.
high precision and mass production. As CAM software and machines become more complicated, the skills required of a machinist or machine operator advance to approach that of a computer programmer and engineer rather than eliminating the CNC machinist from the workforce.
Computer-Aided Design (CAD) and Computer-Aided Manufacturing (CAM)
Computer-aided design (CAD) involves creating computer models defined by geometrical parameters.
These models typically appear on a computer monitor as a three-dimensional representation of a part or a system of parts, which can be readily altered by changing relevant parameters.
The third source of CAD development resulted from efforts to facilitate the flow from the design process to the manufacturing process using numerical control (NC) technologies, which enjoyed widespread use in many applications by the mid-1960s.
The development of CAD and CAM and particularly the linkage between the two overcame traditional NC shortcomings in expense, ease of use, and speed by enabling the design and manufacture of a part to be undertaken using the same system of encoding geometrical data.
The rapid growth in the use of CAD/CAM technologies after the early 1970s was made possible by the development of mass-produced silicon chips and the microprocessor, resulting in more readily affordable computers.
As the price of computers continued to decline and their processing power improved, the use of CAD/CAM broadened from large firms using large-scale mass production techniques to firms of all sizes.
In addition to parts-shaping by traditional machine tool processes such as stamping, drilling, milling, and grinding, CAD/CAM has come to be used by firms involved in producing consumer electronics, electronic components, molded plastics, and a host of other products.
This process can simulate feed rates, angles and speeds of machine tools, the position of part-holding clamps, as well as range and other constraints limiting the operations of a machine.
Computer models are typically three dimensional and can be rotated on any axis, much as one could rotate an actual three dimensional model in one's hand, enabling the designer to gain a fuller sense of the object.
Expert systems might involve the implementation of more abstract principles, such as the nature of gravity and friction, or the function and relation of commonly used parts, such as levers or nuts and bolts.
The ease with which a part's specifications can be changed facilitates the development of optimal dynamic efficiencies, both as regards the functioning of a system of parts and the manufacture of any given part.
It is necessary, for example, for a designer to know the properties of the materials with which the part might be built, the various techniques by which the part might be shaped, and the scale of production that is economically viable.
Another important trend is toward the establishment of a single CAD-CAM standard, so that different data packages can be exchanged without manufacturing and delivery delays, unnecessary design revisions, and other problems that continue to bedevil some CAD-CAM initiatives.
As defined by SearchSMB.com in its article on 'CASE,' 'CASE '¦ is the use of a computer-assisted method to organize and control the development of software, especially on large, complex projects involving many software components and people.'
Computer Aided Manufacturing (CAM): The Complete Introduction for the Beginner’s Mind
You can design the most elegant part in your CAD tool, but if you can’t efficiently make it with a CAM system then you’re better off kicking rocks.
Engineers will make either a 2D or 3D drawing, whether that’s a crankshaft for an automobile, the inner skeleton of a kitchen faucet, or the hidden electronics in a circuit board.
In the world of CAD, any design is called a model and contains a set of physical properties that will be used by a CAM system.
Machining is the controlled process of transforming raw material into a defined shape through actions like cutting, drilling, or boring.
Once the model is prepared for machining, all of that information gets sent to a machine to physically produce the part.
This is the set of instructions that controls a machine’s actions including speed, feed rate, coolants, etc.
Now it’s time to let the machine do the job of executing G-code to transform a raw material block into a finished product.
Watching a Haas milling machine slide through a block of metal like it’s butter puts a smile on my face every time.
These days the only human intervention required for running a CNC machine is loading a program, inserting raw material, and then unloading a finished product.
These machines cut parts and carve out a variety of shapes with high speed spinning components.
For example, a CNC router used for woodworking can make easy work of cutting plywood into cabinet parts.
These machines use precise lasers, high pressure water, or a plasma torch to perform a controlled cut or engraved finished.
Manual engraving techniques can take months to complete by hand, but one of these machines can complete the same work in hours or days.
Milling machines have enormous versatility with a variety of tools that can accomplish specific material and shape requirements.
The overall goal of a milling machine is to remove mass from a raw block of material as efficiently as possible.
A milling machine has a spinning tool and stationary material, where a lathe spins the material and cuts with a stationary tool.
An electrical spark is created between an electrode and raw material, with the spark’s temperature reaching 8,000 to 12,000 degrees Celsius.
The video below from NYC CNC shows a great example of how different manual machines are from today’s CNC machines:
read blueprints, know which tools to use, define feeds and speeds for specific materials, and carefully cut a part by hand.
New machines and CAM software have given us more control than ever to design and make better and more innovative products than our forefathers, which they’ll admit…begrudgingly.
In a new shop setup, this individual typically establishes systems and determines an ideal manufacturing process.
The earliest CAD and CAM jobs were reserved for expensive automotive and aerospace applications, but today software like Fusion 360 is available for manufacturing shops of any shape and size.
With machine operation becoming less of a skilled trade, it’s incredibly hard to attract and retain good talent.
Subscribe to get product updates and enhancements, useful Fusion 360 tips and tutorials, roadmap updates and community stories.
Develop programs to control machining or processing of metal or plastic parts by automatic machine tools, equipment, or systems.
Sample of reported job titles: CAD
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