Exam 5: Tool and Workpiece Setup

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Tool presetters tend to be less accurate than manually touching off the tool to the workpiece.

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What is the work zero?

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The second zero to be concerned with is the workpiece zero (also called the part zero or work zero). The work zero is the origin of our coordinate system from which our part program is written; it is established by edge finding or indicating the workpiece.

No modern machine tools can establish multiple work offsets to define multiple work zeros.

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The chief advantage of the reference tool method is that it makes it easy to set up subsequent jobs in the machine without having to touch off each tool again.

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What is the origin in the Cartesian coordinate system?

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The role of coordinates in NC programming is quite simply to establish the position of the cutting tools in relation to the workpiece.

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What is the major advantage of the reference tool method?

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The ____ is the difference between the length of a cutting tool and a reference value.

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A(n) ____ is a single linear direction used in the Cartesian coordinate system to locate points in space (e.g., left-right, in-out, up-down).

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____ is the act of moving the tool centerline away from the part edge in order to maintain the correct dimensions.

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____ coordinates are not given from a fixed reference point, but rather from the previous point.

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What is the primary use of tool presetting?

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Machine zero is also called ____.

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Tool presetting is a method commonly used to establish the length offset and ____ of a newly installed cutting tool.

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The fixture offset is also called the ____ offset.

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The simplest coordinate system related to machining has just two dimensions.

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Where is the coordinate system placed on the workpiece?

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The diameter ____ is a value stored in the offsets register in the control that will be used for automatic cutter compensation.

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Many CNC machine tools (particularly lathes) are now equipped with "tool ____" that use an electronic measuring device to establish the tool offsets.

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A(n) ____ coordinate is given by stating the radius from the origin and the angle of rotation.

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