GSA A-A-2537 A-2002 TRAMMELS《圆规》.pdf
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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
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- GSAAA2537A2002TRAMMELS 圆规 PDF
