Exam 6: Programming Concepts and Job Planning

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The geometry of the finished workpiece will be the ultimate measure of the success or failure of your programming.

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Provide some guidelines for developing efficient workpiece setups.

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In summary, the following guidelines will help you to develop setups that are more efficient: Follow the 3-2-1 locating principle when applicable. Use as few setups as possible. Eliminate preparatory and secondary operations if possible. Use off-the-shelf tooling when possible and build dedicated fixtures only as a last resort. Coordinate the raw material purchase with the process plan.

The key to properly locating a workpiece is a principle called ____.

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What information should be included in the program's comments?

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A(n) ____ is a reference plane or point that is defined on the engineering drawing from which other dimensions are established.

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The term ____ describes codes or values that stay active until changed by another code or value.

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We know from our study of the Cartesian coordinate system that any location in the first quadrant will have ____ coordinates.

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What is the difference between modal and non-modal codes?

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Why do complicated drawings take so long to understand?

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In the end, it does not really matter where you put the work zero as long as it is kept in the proper relation to the locating surfaces.

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What are the two types of codes found in an NC part program?

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Most programs today are written on modern, PC-based computers with a text editor that makes it very easy to copy and paste redundant code and to make changes at will.

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____ pins are cylindrical pins that have been ground slightly oversized.

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Modern CNC machine tools can be programmed to perform machining operations with a language commonly referred to as H & N codes.

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Rough, cast, and saw-cut surfaces must usually be ____ before they can be used as locating surfaces.

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On most raw materials, the stock faces are relatively flat and square from the mill.

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____ compensation automatically offsets the tool from the programmed path.

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Toolpaths are difficult to plot because we have to manually compensate for the ____ of the tool.

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The NC part program is made up of distinct units of instruction called ____.

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What is the first step in planning and executing a CNC machining job?

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