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Precision Machining Technology Contests |
Home • Career Overview • Precision Machining Contests • Technical Standards • Photo Album
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Precision Machining Technology Contests |
Home • Career Overview • Precision Machining Contests • Technical Standards • Photo Album
DEFINITION:
Since its inception in 1953 CNC has continued to play an increasingly important role in product manufacturing. With the tools and machines that are available, manufacturing facilities now have the capability of reproducing parts at an exceptional rate with repeatable accuracy. Technology in manufacturing methods us changing rapidly. Today 90% of all machine tools manufacturing in the world are computerized to enhance capability. Students must have the basics of CNC to have a chance to compete in the skilled trades workforce of today. It becomes even more important for tomorrow's workforce.
CONTEST REQUIREMENTS:
Each contestant is asked to "program" or plan out the exact sequence of operations and all of the specific movements and cutting parameters for a cylindrical workpiece to be made on a CNC lathe and a rectangular workpiece to be made on a CNC mill. Contestants are judged on the accuracy of their program and their computer usage skills.
NIMS RELATED STANDARDS:
Machining Level I Duty Areas: 1.1, 2.3, 2.4, 2.5
Machining Level I KSAO Areas: 1.1, 1.2, 2.1, 2.2, 5.1, 5.2, 7.1, 7.2, 7.3,
7.4, 7.5
Machining Level II Duty Areas: 1.1, 2.3, 2.4, 2.5, 2.6, 2.7, 2.21, 2.22, 2.23
Machining Level II KSAO Areas: 1.1, 1.2, 2.1, 2.2, 2.3, 3.2, 5.2, 5.3, 5.4,
6.1, 6.2, 7.1, 7.2
DEFINITION:
Some operations performed in the shop require the use of hand tools. These tools typically are used at a workbench. Thus the terms "bench tools" and "bench work".
CONTESTANT REQUIREMENTS:
Contestants in this competition must be familiar with these tools and how they should be used properly. Manual skill in the use of hand tools can only be developed through constant use and practice.
Accuracy with basic measuring tools in conjunction with layout hand tools are also part of the contest. In machine shop work, layout means the marking or scribing of lines to indicate in full scale the location of a feature (hole) or area to be machined.
NIMS DUTY REFERENCES:
Level I: 1.1, 2.1, 2.2, 3.1, 4.1, 5.1, 6.1
Level II: 1.1, 2.1, 5.1, 6.1
Level III: none
DEFINITION:
The drill press is one of the most frequently used machine tools, Its principle purpose is the cutting of round holes into or through materials. This machine employs a variety of cutting tools; the twist drill is most common. Drilled holes may be finished or modified by reaming, boring, countersinking, counterboring, spotfacing, and tapping.
CONTEST REQUIREMENTS:
Contestants in this competition must be able to locate holes to be drilled accurately. Successful operation of the drill press not only requires knowledge of various setups, selection of correct speeds and feeds, selection of the most effective cutting fluids, proper drill geometry for machining a variety of work materials, but also a working knowledge of the machine itself.
NIMS DUTY REFERENCES:
Level I: 1.1, 2.2, 2.8, 3.1, 5.1, 6.1
Level II: 1.1, 2.1, 5.1, 6.1
DEFINITION:
Surface grinding is done to produce flat surfaces on workpieces held in contact with a grinding wheel. Other types of precision grinders are available to grind other shapes or contours.
The grinding operation depends upon the abrasive or cutting qualities of emery, corundum, carborundum, or other materials bonded and formed into a wheel. The grinding wheel and the grinding machines have become such important factors today that without them our mass production would be impossible.
Because of the construction and accuracy of grinding machines today, workpieces can be held to extremely close tolerances in dimension and finish.
NIMS DUTY REFERENCES:
Level I: 1.1, 2.7a, 2.7b, 3.1, 4.1, 5.1, 6.1
Level II: 1.1, 2.15, 2.16, 5.1, 6.1
DEFINITION:
Milling is the process of producing machined surfaces by progressively removing a predetermined amount of material from the workpiece which is fed to a rotating milling cutter.
One of the characteristic features of the milling process is that each milling cutter tooth removed its share of stock in the form of individual chips.
The quality of finish, or the physical character of a machined surface produced by the milling process is determined by the method of milling. There are two basic methods of milling - peripheral milling and face milling.
CONTESTANT REQUIREMENTS:
To be a successful contestant in milling depends to a large extent on the ability to properly setup the workpiece and the cutting tools. Wrong selection of cutters & cutting speed, lack of rigidity in the setup and mis-calculating machine movements will result in poorly machined surfaces and inaccuracies.
NIMS DUTY REFERENCES:
Level I: 1.1, 2.5, 2.6, 3.1, 5.1, 6.1
Level II: 1.1, 2.6, 2.7, 5.1, 6.1
DEFINITION:
In precision machining work, every workpiece must be machined accurately to size within close limits. Careful measuring of the workpiece is necessary to insure proper fit and satisfactory operation of each part when it is assembled with other parts.
Inaccurate and careless measurements are worthless. They waste time and materials.
CONTESTANT REQUIREMENTS:
Contestants in every part of the precision machining technology contest are responsible for doing accurate work. They, therefore must be able to use with speed and accuracy the precision measuring tools being used in industry today!
In the Process Control (Inspection) competition, there are seven different measuring tool stations that each contestant must go through. The challenge is to quickly figure out how to measure the required feature using the measuring tools provided at that station. Both inch and metric measurements are required.
NIMS DUTY REFERENCES:
Level I: 1.1, 3.1, 3.2
Level II: 1.1
Level III: none
CONTEST: TURNING
AREA: ENGINE LATHE
DEFINITION:
The major function of the engine lathe is to change the size, shape, or finish of a revolving workpiece by one cuts or a series of cuts into the workpiece with cutting tools that can be adjusted to the workpiece. With proper attachments and adjustments, a lathe can also drill, bore, ream, tape, and thread. The variety of operations the engine lathe can perform make it one of the most useful and necessary machines in the shop.
CONTESTANT REQUIREMENTS:
Contestants, after studying the engineering drawing, are required to plan how they will hold the workpiece, select the proper cutting tools, adjust the machine to run at the proper speeds and feeds for the material being worked on and the cutters selected. The parts begin machined were designed to test the skill and knowledge of the contestant in both internal and external lathe operations.
NIMS DUTY REFERENCES:
Level I: 1.1, 2.4, 3.1, 4.1, 5.1, 6.1
Level II: 1.1, 2.5, 3.1, 5.1, 6.1