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ASME B89.3.4-2010 pdf download

ASME B89.3.4-2010 pdf download.Axes of Rotation: Methods for Specifying and Testing.
Proposing Revisions. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard. Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. Proposing a Case. Cases may be issued for the purpose of providing alternative rules when justified, to permit early implementation of an approved revision when the need is urgent, or to provide rules not covered by existing provisions. Cases are effective immediately upon ASME approval and shall be posted on the ASME Committee Web page. Requests for Cases shall provide a Statement of Need and Background Information. The request should identify the Code, the paragraph, figure or table number(s), and be written as a Question and Reply in the same format as existing Cases. Requests for Cases should also indicate the applicable edition(s) of the Code to which the proposed Case applies. Interpretations. Upon request, the B89 Committee will render an interpretation of any require- ment of the Standard. Interpretations can only be rendered in response to a written request sent to the Secretary of the B89 Standards Committee. The request for interpretation should be clear and unambiguous. It is further recommended that the inquirer submit his/her request in the following format: Subject: Cite the applicable paragraph number(s) and the topic of the inquiry. Edition: Cite the applicable edition of the Standard for which the interpretation is being requested. Question: Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation.
2.1.10 Axis Shift axis shift: a change in position of the axis of rotation caused by a change in operating conditions. NOTES: (1) Causes ofaxis shiftinclude thermal drift, load changes, preload changes, and speed changes. (2) An axis shift that occurs during an error motion measurement will affect the error motion values. (3) Error motion specifications assume constant conditions unless specified otherwise. 2.1.11 Displacement Indicator displacement indicator: a device that measures changes in distance between two objects. NOTE: Examples include capacitive gages, linear variable differ- ential transformers (LVDTs), eddy current probes, laser interferom- eters, and dial indicators. 2.1.12 Structural Loop structuralloop: theassemblyofcomponents thatmaintain the relative position between two specified objects. NOTE: A typical pair of specified objects is the cutting tool and the workpiece; the structural loop would include the workpiece, chuck, spindle rotor, bearings, stator, headstock, the machine slideways and frame, the tool holder, and the cutting tool. (In this Standard, a displacement indicator qualifies as a tool.) 2.1.13 Structural Error Motion structural error motion: error motion measured from the spindle stator to the tool, from the rotor to an object mounted to the rotor, or from any two specified objects outside the stator-to-rotor structural loop. 2.1.14 Sensitive Direction sensitive direction: the direction normal to the surface of a perfect workpiece through the instantaneous point of machining or measurement (as shown in Fig. 2). 2.1.15 Nonsensitive Direction nonsensitive direction: any direction perpendicular to the sensitive direction. 2.1.16 Fixed Sensitive Direction fixed sensitive direction: the sensitive direction is fixed when the workpiece is rotated by the spindle and the point of machining or measurement is not rotating.

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