GSA A-A-2537 A-2002 TRAMMELS《圆规》.pdf

1、I INCH-POUND IA-A-2537AMay 16,2002SUPERSEDINGA-A-2537March 25,1987COMMERCIAL ITEM DESCRIPTIONTRAMMELSThe General Services Administration has authorized the.use “ofthk Commercial ItemDescription by all federal agencies.1. SCOPE. This Commercial Item Description covers trammels for layout work and for

2、 measuringdistance between points too great for ordinary dividers.2, CLASSIFICATION. The trammels shall confopn to the following types.2.1 Trammels with steel beam.2.2 Type II, Trammel heads.a 3. SALIENT CHARACTERISTICS.3.1 Type I Desirer. Type I trammels shall be of a precision type and consist of

3、a pair of trammel heads, afine adjustment attachment, a pair of scriber points, a pair of caliper legs, a steel beam, and shall besimilar to figure 1.Figure 1. Type I, Trammel with steel beamo Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any other datawhich ma

4、y improve this document should be sent to: General Services Administration, Federal SupplyService, Hardware SuperStore, 6FEE. 1500 Bannister Rd Bldg.# 6, Kansas City, Missouri. 64131.FSC 5210Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-2537A3.

5、1,1 Trammel heads. One head shall consist of a shaft having a hole to slip fit on the steel beam and achuck for holdhg points. A knurled locking nut shall be provided for holding the head securely on thebeam. A spring friction device shall be provided to hold the head in position when the nut is loo

6、sened.The other head shall be similar, except that a fine adjustment clamp and adjusting screw shall beattached.3.1.2 Chucks. The chucks shall be of such design as to grip and firmly hold the points at any positionwithin the adjustment range and shall be knurled on the outside dkuneter.s3.1.3 Lockin

7、g nuts. Locking nuts shall be round and knurled on the outside dkmneter. 1.4 Fine adjustment clamm The tine adjustment clamp shall consist of a yoke to accommodate a fineadjustment screw and nut. The clamp shall be made to slip tit on the steel beam and be provided with alocking screw for holding th

8、e clamp firmly in position. Clearance between the yoke and bearing surfaceof nut shall not exceed .005 inch.3.1.5 Fine adjustment screw and nut. One end of the screw shall pass through the yoke and nut of the fineadjustment clamp. The nut shall be round and knurled on the outside diameter. The other

9、 end of thescrew shall thread into one of the heads. The screw shall provide a tine adjustment of not less than 3/8inch.3.1.6 Scribe uoints. Trammels shal be furnished with two replaceable scribe points, which shall be madeof tool steel. The points shall have a straight shaft with one end tapered fr

10、om 1 inch to a sharp point.Points shall not be less than 3 inches or more than 5 inches in length. Tiu hardness shall be from 50 to 56-.on the Rockwell C scrde in accordance with ASTM E-18 when tested and have a ground finish.e3.1.7 Calimr legs. Cahper legs shall conform to the requirements for scri

11、be points except the pointedsection shall be bent to 90 degrees as the legs of inside calipers.3.1.8 _ Beams shall be made of a steel rod with a flat machined on one side to preventmisalignment when the heads are clamped in position. The beam shall be 5/16 inch, +/- 1/64 inch indiameter, 20 inches,

12、+/- 1/8 inch, in length.3.2 Twe II Design. Type H trammels shall consist of 2 heads with removable scribe points, lockhgscrews, a tine adjustment device, a pencil attachment, and shall be similar to figure 2. (Beam notincluded).Figure 2. Type II, Trammel heads (beam not included).2Provided by IHSNot

13、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-2537A3.2.1- Trammel heads shall be made of bronze, brass, zinc alloy die casting, or steel. The headsshall be suitable for attachhg to a wooden beam 3/4 inch wide and 5/16 inch thick, shall have a locklngscrew, and s

14、uitable for means for attaching points. One head shall have a fine adjustment attachment.3.2.2 Locklnz screws. Locking screws shall have a close tit to the threaded hole in the head. The screwhead shall be round and knurled. The screw tip shall depress a block or plate to contact the beam as to notl

15、eave an indention in the beam and hold the head firmly in place. The block or plate shall be contained ina channel not to turn with the locking screw.3.2.3 Fine adjustment attachment. A fine adjustment attachment shall be supplied with one of thetrammel heads to provide tine adjustment of at least 1

16、/2 inch.3.2.4 Scribe ooints. Points shall be made of tool steel with a straight shaft. One end shall be tapered ffom1 inch to a sharp point. The opposite end shall be threaded to attach it to the head. Points shall not be lessthan 2 1/2 inches or more than 5 inches in length. Tip hardness shall be f

17、rom 50 to 56 on the Rockwell Cscale in accordance with ASTM E-18 when tested, and have a gound finish.3.3 = The trammel shall have a machine ground, chrome, black oxide, or black wrinkle finish.3.4 Threads. The threads of all components of tmmrnel heads shall be in accordance with FederalStandard H2

18、8.3.5 Identification markimz. The tool shall be marked with the manufacturers name or identifying symboland the state or countiy of manufacture, unless otherwise specified. All identification markings shall beetched, engraved, molded, or indented dkectl y on the items surface in such a marmer that i

19、t remainsclearly legible throughout the life of the item.3.6 Workmanship. Details of workmanship shall be in accordance with the best commercial practices.Paints, coatings, plating, and finishes shall be smooth, adherent, continuous and not stained or discolored.External surfaces shall be free of to

20、ol and gouge marks, nicks, or other s,urface imperfections. The itemshall be free from manufacturing workmanship defects (e.g. sharp or rough external edges, comers, orsuriaces) and material workmanship defects (e.g. pits, rips, tins, burrs, tears, nodules, cracks, or blisters),which may adversely i

21、mpact the items serviceability, durability, safety, or appearance4, REGULATORY REQLTREMENTS.4.1 Recovered materials. The supplier/manrrfactnrer is encouraged to use recovered materials to themaximum extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation(FAR),4.

22、2 Metric products. Products manufactured to metric dimensions will be considered on an equal basiswith those manufactured using inch-pound units, provided they fall within the tolerances specified (usingconversion tables contained in the latest revision of Federal Standard 376) and all other require

23、ments ofthis document are met. If a product is manufactured to metric dimensions and those dimensions exceedthe tolerances specified in the inch- pound units, a request should be made to the contracting officer todetermine if the product is acceptable.5. PRODUCT CONFORMANCE.5.1 Product Confommce. Th

24、eproducts provided shall meettie sdientchacteristics of thisCommercial Item Description, conform to the suppliers own drawings, specifications, standards and3Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IA-A-2537Aquality assurance practices, and t

25、he same product and offered for sale in the commercial market. Thegovernment reserves the right to require proof of such conformance.5.2 Resoonsibilitv for inspection. Unless otherwise specified, the supplier is responsible for theperformance of all inspection requirements and may use any commercial

26、 facilities (including thesuppliers own facilities) suitable for performance of the inspection requirements, unless disapproved bythe Government. The Government reserves the right to perform any inspections deemed necessary toassure the item conforms to the specified requirements.6. PACKAGG. Require

27、ments of preservation, packing, packaging, and marking of packages shall beas specified in the contract or order.7. NOTES.(This sectioncontains information of a general or explanatory nature that is not mandatory.)7.1 Addresses for obtaining couies of referenced documents:Federal Acquisition Regulat

28、ion (FAR): Government Printing Office, Superintendent of Documents,Washington, DC 20401-9371GSA Specification Section (3FP-E), Suite 8100,470 LEnfant Plaza, SW, Washington, DC, 20407.American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA,19428-29597.2 Nationa

29、l Stock Numbers (N SNS). The following list of NSNs corresponds to the styles specified inthis CID. This list may”not be indicative of all possible NSNS associated with this CID.Type 1, Trammel with steel beam. _5210-00-221-1848 . 36-inch long beam.5210-01-330-1016 I 10 %-inch long beam.Type 2, Tram

30、mel for rectangular wood-beam (beam not included),5210-00-221-1850 II 2-heads with points5210-00-267-4905 11 12-piece set7.3 Ordering data, Purchasers should select the prefemed options permitted herein and should include thefollowing information in procurement documents:(a) Title, number, and date

31、of Commercial Item Description.(b) Type and details.(c) When applicable, the appropriate NSN(S)7.4 Key words. Trammels.MILITARY INTERESTS: Preparing Activity:NONE: DoD has no registered interest GSA - FSSin revisions and amendments to thkCommercial Description until furthernotice.4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-