DUAL-USE LIST DEFINITIONS

"Accuracy" --

 Usually measured in terms of inaccuracy, defined as the maximum deviation, positive or negative, of an indicated value from an accepted standard or true value.

 "Angular position deviation" --

The maximum difference between angular position and the actual, very accurately measured angular position after the workpiece mount of the table has been turned out of its initial position.

(Ref. VDINDE 2617 Draft: "Rotary table on coordinate measuring machines")

"Basic scientific research"--

Experimental or theoretical work undertaken principally to acquire new knowledge of the fundamental principles of phenomena and observable facts, not primarily directed toward a specific practical aim or objective.

"Contouring control" --

Two or more "numerically controlled" motions operating in accordance with instructions that specify the next required position and the required feed rates to that position. These feed rates are varied in relation to each other so that a desired contour is generated. (Ref. ISO 2806-1980 as amended)

"Development" --

is related to all phases before "production" such as:

 

 "Fibrous or filamentary materials" --

 means continuous 'monofilaments', 'yarns', 'rovings', 'tows' or 'tapes'.

 N.B.:

1. 'Filament' or 'monofilament'--is the smallest increment of fiber, usually several ~tm in diameter.

2. 'Roving' --is a bundle (typically 12-120) of approximately parallel 'strands'.

3. 'Strand' --is a bundle of 'filaments' (typically over 200) arranged approximately parallel.

4. 'Tape' --is a material constructed of interlaced or unidirectional 'filaments', 'strands', 'rovings', 'tows' or 'yarns', etc., usually preimpregnated with resin.

  5. 'Tow' --is a bundle of 'filaments', usually approximately parallel.

 6. Yarn' --is a bundle of twisted 'strands'.

 'Filament' --

 See "Fibrous or filamentary materials".

 "In the public domain"--

 ''In the public domain", as it applies herein, means "technology" or "software" that has been made available without restrictions upon its further dissemination. (Copyright restrictions do not remove "technology" or "software" from being "in the public domain".)

 "Linearity" --

 (Usually measured in terms of non-linearity) is the maximum deviation of the actual characteristic (average of upscale and downscale readings), positive or negative, from a straight line so positioned as to equalize and minimize the maximum deviations.

 "Measurement uncertainty" -~

 The characteristic parameter which specifies in what range around the output value the correct value of the measurable variable lies with a confidence level of 95%. It includes the uncorrected systematic deviations, the uncorrected backlash, and the random deviations. (Ref. VDINDE 2617)

 "Microprogram" --

 A sequence of elementary instructions, maintained in a special storage, the execution of which is initiated by the introduction of its reference instruction into an instruction register.

 'Monofilament' --

 See "Fibrous or filamentary materials".

 "Numerical control"--

The automatic control of a process performed by a device that makes use of numeric data usually introduced as the operation is in progress. (Ref. ISO 2382)

 "Positioning accuracy"--

of "numerically controlled" machine tools is to be determined and presented in accordance with Item 1.B.2., in conjunction with the requirements below

(a) Test conditions (ISO 230/2 (1988), paragraph 3):

(1)     For 12 hours before and during measurements, the machine tool and accuracy measuring equipment will be kept at the same ambient temperature. During the premeasurement time, the slides of the machine will be continuously cycled identically  to the way they will be cycled during the accuracy measurements;

(2) The machine shall be equipped with any mechanical, electronic, or software compensation to be exported with the machine;

(3) Accuracy of measuring equipment for the measurements shall be at least four times more accurate than the expected machine tool accuracy;

(4) Power supply for slide drives shall be as follows:

(i) Line voltage variation shall not be greater than ‑+ 10% of nominal rated voltage;
(ii) Frequency variation shall not be greater than‑+ 2 Hz of normal frequency;
(iii) Lineouts or interrupted service are not permitted

 (b) Test Program (paragraph 4):

 (1) Feed rate (velocity of slides) during measurement shall be the rapid traverse rate;

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  N.B.: In the case of machine tools which generate optical quality surfaces, the feed rate shall be equal to or less than 50 mm per minute;

 (2)  Measurements shall be made in an incremental manner from one limit of the axis travel to the other without returning to the starting position for each move to the target position;

 (3) Axes not being measured shall be retained at mid-travel during test of an axis.

 (c)  Presentation of the test results (paragraph 2): The results of the measurements must include:

(1) "positioning accuracy" (A) and (2) The mean reversal error (B).

"Production" --

 means all production phases such as: 

 "Program" --

  A sequence of instructions to carry out a process in, or convertible into, a form executable by an electronic computer.

 "Resolution" --

  The least increment of a measuring device; on digital instruments, the least significant bit. (Ref. ANSI B-89.1.12)

 "Roving" --

  See "Fibrous or filamentary materials".

 "Software" --

  A collection of one or more "programs" or "microprograms" fixed in any tangible medium of expression.

 'Strand' --

  See "Fibrous or filamentary materials".

 'Tape" --

  See "Fibrous or filamentary materials".

 "Technical assistance"--

  ''Technical assistance" may take forms such as: instruction, skills, training, working knowledge, consulting services.

  Note: "Technical assistance" may involve transfer of "technical data".

 "Technical data"--

  ''Technical data" may take forms such as blueprints, plans, diagrams, models, formulae, engineering designs and specifications, manuals and instructions written or recorded on other media or devices such as disk, tape, read-only memories.

 "Technology" --

  means specific information required for the "development", "production", or "use" of any item contained in the List. This information may take the form of "technical data" or "technical assistance".

 "Tow" --

  See "Fibrous or filamentary materials".

 "Use" --

  Operation, installation (including on-site installation), maintenance (checking), repair, overhaul, and refurbishing.

 "Yarn" --

 See "Fibrous or filamentary materials".