1、4 A-A-59120 M 9999974 0375970 382 C 4 INCH-POUND A-A-5 9 120 22 September 1997 SUPERSEDING 14 February, 1974 MIL-G-83 984 COMMERCIAL ITEM DESCRIPTION GAUGE, SURFACE PLATE FLATNESS CHECKING The General Services Administration has authorized the use of this commercial item description(CID) as a replac
2、ement for MIL-G-83984 for all federal agencies. 1. SCOPE 1.1 Scope. This Commercial Item Description (CID) covers a gauge for checking surface plate wear, including a master reference gauge calibrator, complete with protector cases and covers. 1.2 Intended Use. The intended use of the surface plate
3、flatness checking gauge covered by this CID is the calibration of plane surfaces and the periodic checking of surface plate wear and condition. 2. SALIENT CHARACTERISTICS 2.1 Desim. Each gauge shall be new and of the quality and design currently being offered by manufacturers as an industry accepted
4、 standard. The gauge assembly shall include a calibrated straight edge and a dial indicator. 2.1.1 Interchangeability. All parts shall be manufactured to such standards as will permit replacement or adjustment without modification of component parts. 2.1.2 Material. All parts used in fabrication of
5、the gauge shall be new and of the quality necessary to produce a gauge assembly to meet the requirements described herein. Beneficial comments, recommendations, additions, deletions, clarifications, etc., and any data which may improve this document should be sent to: WR-ALCLKJE, 460 Second Street,
6、Ste 221, Robins AFB, GA 31098-1640. AMSC NIA FSC 5220 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- A-A-59120 9999974 0175971 219 A-A-59120 devices. All screws, pins and bolts shall be installed with means for preventing loss of tightness. All suc
7、h parts, when subject to removal or adjustment, shall not be swaged, peened, staked or otherwise permanently deformed. 2.2.3 Surface finish. All surfaces shall be smooth and free from burrs and sharp edges. Surfaces that are subject to corrosion when exposed to normal use shall be protected against
8、such corrosion in a manner that will ensure compliance with this CID. The protective coating shall not loosen, chip, crack or scale with normal use and age. 2.3 Components. 2.3.1 Dial indicator. The dial indicator shall be designed to meet the requirements of American Gauge design standard, ASME/ANS
9、I B89.1.1 OM-1987 or an equivalent gauge design standard which will meet or exceed the requirements described herein. Dial graduations on the indicator shall be for not greater than twenty millionths of an inch(O.OOOO2O”). Measurement accuracy of the indicator shall be within one graduation of the d
10、ial indicator. Total full scale dial range of the indicator shall be at least two thousandths of an inch (minus 0.001 to plus 0.001 minimum). Full scale deflection of the indicator shall not require more than four (4) ounces of force applied to the contact point. The indicator or the indicator mount
11、ing shall have minute adjustment provisions for zeroing dial indications (a loading is allowable on the spindle when this adjustment is made). The dial indicator shall have the capability of indicating surface variations of 0.000020 inches. 2.3.1,l Contact point. Unless otherwise specified, contact
12、points shall be either ruby or a material of equal or better wear resistance and hardness when compared to ruby. 2.3.2 Indicator mounting bar or block. The bar or block shall be designed to provide rigid reliable support for the indicator. An extension handle or other suitable means shall be provide
13、d to minimize temperature change and possible erroneous measurement as a result of handling the indicator mounting block. The bar or block shall be provided with a minute adjustment feature for positioning the indicator. 2.3.3 Calibrated straightedge. The straightedge shall be used in conjunction wi
14、th the block mounted indikator. The straightedge shall be equipped with not less than one fixed support and one adjustable support. The height of the fixed support shall correspond with the height of the 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
15、,-,-A-A-59120 W 9999974 0175972 155 A -A-59120 block mounted indicator. The adjustable support shall be provided with a minute precise adjustment feature for positioning both ends of the straightedge in a reference plane that is parallel to the surface being checked. 2.3.3.1 Straightedge sizes and a
16、ccuracies. The overall guaranteed flatness accuracy shall be within the tolerances specified in table I for the respective straightedge sizes shown. The size of straight edge required shall be as specified (see 6.3). This size is the useful length of the straightedge that is applicable. TABLE I. Str
17、aightedge size and accuracies. Straight-edge Tolerances Length (Inches) (Inches) 24 36 48 60 O .O0005 O 0.000070 0.000 1 3 O 0.000180 2.4 Namedate. A corrosion resistant metal nameplate, permanently and legibly marked with the following information, shall be securely attached to each gauge assembly.
18、 Nomenclature Manufacturers name Manufacturers model number Manufacturers serial number Date of Manufacture Contract or Order number Federal Stock Number us 3. QUALITY ASSU”CE PROVISIONS 3.1 Product Conformance. The products provided shall meet the salient characteristics of this commercial item des
19、cription, conform to the producers own drawings, specifications, standards, and quality assurance practices, and be the same product offered for sale in the commercial market. The government reserves the right to require proof of such conformance. 4. PACKAGING 4. i Preservation and Packaging. Preser
20、vation, packing, and marking shall be as specified in the contract or order. 3 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- A-A-59120 9999974 0375973 O93 = A-A-59120 5. NOTES 5.1 Addresses for obtaining copies of referenced documents. American
21、Society of Mechanical Engineers(ASME) / American National Standards Institute (ANSI) B89.1.1 OM- 1987 - Dial Indicators (For Linear Measurements) (Aptlication for copies should be addressed to the American National Standards Institute, 1 1 W 42“ St., New York, NY 10036 or to the American Society of
22、Mechanical Engineers, 345 E 47* St., New York, NY 10017. Non-government publications are also available in or through libraries, or other informational services.) 5.2 Ordering; data. Procurement documents should specify the following: a. Title, number, and date of this commercial item description. b
23、. Contact point material, if different (see 2.3.1.1). c. Straightedge useful surface length required (see 2.3.3.1-and Table 1). 5.3 National Stock Numbers RJSNs). The following is a list of NSNs assigned which meet the requirements of this CID. 5220-0 1-046-3 529 5220-0 1-033-0 124 5.4 Source. The f
24、ollowing is a source known to meet the requirements of this CID. Rahn Granite Surface Plate Co. 75 Holiday Dr. Englewood, OH 45322-2706 CAGE: 94182 MTLITARY INTERESTS: Custodians: AirForce - 99 Army - AR Reviewers: Army - AT CIVIL AGENCY COORDINATING ACTIVITY: GSA - FSS Preparing Activity AirForce - 84 Agent Activity: Air Force - 99 (Project 5220-0234) 4 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
