1、A-A-52034A 66 = 9999974 O064304 4 A-A-52034A February 13, 1992 COMMERCIAL ITEM DESCRIPTION DRAFTING INSTRUMENT SETS AND DRAFTING INSTRUMENTS The General Services Administration has authorized the use of this commercial item description in preference to Federal Specification GG-D-600D. This specifica
2、tion covers four drafting instrument sets, and individual drafting instruments. The drafting instruments are intended for use by architects, engineers, scientists and draftsmen for general drafting practice, Salient characteristics: Classification. Drafting instruments shall be supplied in four clas
3、sifications of sets (see table I): Set 1- -Field set Set 2-Office set Set 3-Pocket set Set 4-Mini set When required, individual drafting instruments shall be as specified. Each individual instrument shall be supplied with a plastic case with a hinged lid and fastener, size fitted to the instrument;
4、or a plastic vinyl pouch with foldover tucked flap. Beneficial comments (recommendations, additions, deletions) and any other data which may improve this document should be sent by letter to: Commander, US Army Belvoir Research, Development and Engineering Center, ATTN: STREW,-TSE, Fort Belvoir, VA
5、22060-5606. AMSC N/A FSC 6675 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Licensed by Information Handling ServicesA-A-52034A bb 7777774 0064305 b A-A-52034A TABLE I. Drafting instrument sets. Set 1 Set 2 Set 3 Set 4 Description field office pocket mini Case Rul
6、ing pen, small large Small Bow compass, pen pencil comb inat ion Large Bow compass Compass, large, friction Lengthening bar Dividers, small large Center horn Spare parts and lead holder Screw driver (when required) Protractor, type I, class A, 8 - Inch Triangle, class A, 30“ -60“ 6-inch class B, 45“
7、 4 - inch Ruling pen, contour railroad Curve, pattern 1 pattern 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 . 1 2 Licensed by Information Handling Servicesc A-A-52034A bb m 9999974 00b430b W A-A-52034A Material. The instruments shall be corrosion-resisting s
8、teel, or chrome- and nickel-plated brass, at the contractors option, Materials shall be free from defects which could impair the function or appearance of the instruments. Surfaces shall be smooth, free from burrs and sharp corners (except needles), and shall be polished or have a satin finish. The
9、steel shall conform to UNS S30100, S30400, S42000, or S43000, condition and temper as required. Brass shall conform to ASTM B 36 copper alloy UNS C26800, temper H02, or ASTM B 455 copper alloy UNS CS85000, minimum Rockwell B Hardness of 42 and shall be chrome-plated to a thickness of not less than 0
10、.0004 inch or nickel-plated to a thickness of not less than 0,0003 inch. Aluminum for handles, lengthening bars, and other parts shall conform to ASTM B 211, UNS A92011 or A92024. Design. Instruments shall be constructed of solid material, truss type, or hollow tube. In truss type, each truss shall
11、be not less than 0.060 inch thick. If hollow tube type, the wall thickness shall be not less than 0.045 inch throughout the length of the piece. All compass and divider points shall be aligned to register accurately in closed position. Attachments, such as lengthening bars or beams, and pen and penc
12、il parts, shall fit freely; and when tightened, shall not twist or turn. Compass and divider handles. Compass and divider handles shall be the same material as the instrument and shall be finely knurled or shall have fine longitudinal corrugations. Handles shall be between 0.625 and 0.875 inch long,
13、 and between 0.187 and 0.312 inch in diameter. Screws. All screws and screw studs shall be corrosion-resisting steel. Screw heads and adjusting nuts shall be knurled and shall be leaded brass conforming to ASTM B 455, copper alloy UNS C38500, or corrosion-resisting steel. Needle Doints. Needle point
14、s shall be nickel-plated or corrosion- resisting steel. Needles shall have a shoulder point on one end and a needle point on the other. Each point shall be concentric with the body of the needle, and shall be sharp. Pencil leads. Each instrument requiring pencil leads shall have a pencil lead firmly
15、 clamped in its proper socket. Pencil leads shall be between 1 and 1.25 inches long and 0.078 inch, +0.002 inch or -0.005 inch thick. Pencil lead shall have a 4H degree of hardness and shall have a chisel point. Cases. Each set of drafting instruments shall be contained in a fitted case with a hinge
16、d lid. The case shall be wood, plastic, or aluminum. the instrument for which it is intended. When in the case, no instrument shall come in contact with any other instrument or The bottom of each case shall have recesses shaped to fit 3 Licensed by Information Handling Services- A-A-52034A bb 999997
17、4 0064307 T A-A-52034A attachment in the case. The inside of the case, including that part that covers the instruments when the case is closed, shall be lined with dark colored velvet, velveteen, or plastic foam rubber. Fasteners shall be provided to keep the case closed when not in use. Fasteners a
18、nd hinges shall be corrosion-resisting metal. Ruling Dens (exceDt contour and railroad Dens). Pen blades shall be spring-blade, spring-hinge, or cross-hinge types. Blade points shall have a hardness of 47 f7, on the Rockwell C-scale or equivalent. adjustable to permit drawing clean, uniform, unbroke
19、n lines between 0.006 inch and 0.03-inch wide on drawing paper, tracing cloth, and on matte-surfaced plastic sheet. The points shall not cut into the drafting medium under normal use. The blades shall be sharpened and set, and shall be Ruling Den handles. Ruling pen handles shall be rigid plastic or
20、 metal, and shall be between 0.187 and 0.25 inches in diameter. Small ruling Den. The small ruling pen shall be between 4.5 and 5.5 inches long. The blade portion shall be 2 inches, f-0.25 inch, long. Large ruling pen. The large ruling pen shall be between 5.5 and 6.5 inches long. The blade portion
21、shall be 2 inches, f0.25 inch. Bow compass. The action of the legs of the bow compass shall be controlled by a center adjusting thumbscrew. shall open and close the spacing firmly and smoothly and shall hold the legs rigidly while drawing circles. The adjusting screw Small bow comDass. The small bow
22、 compass shall be between 3.5 and 4.5 inches long, and shall permit drawing circles from 0.031 inch to at least 2 inches in diameter. ComDass Den. adjustable needle in one leg and a ruling pen in the other leg. The pen blades shall be as specified in the paragraph on ruling pens, above, except that
23、the maximum width of the line shall be 0.03 inch. The compass pen shall be provided with a removable and Compass pencil. The compass pen shall be provided with a removable and adjustable needle in one leg and a pencil-lead holder in the other leg. The pencil-lead holder shall accommodate the pencil
24、leads as specified above. Combination bow comuass. The combination bow compass shall be provided with a removable and adjustable needle in one leg, and the other leg shall have an interchangeable pen holder and pencil holder, place without movement when tightened. accommodate pen blades conforming t
25、o the paragraph on ruling pens The pen holder or the pencil holder shall be held firmly in The pen holder portion shall 4 Licensed by Information Handling ServicesA-A-52034A 66 9999974 O064308 L m, A-A-52034A (except contour and railroad pens), above. The pencil holder portion shall accommodate lead
26、s conforming to the paragraph on pencil leads, above. Large bow compass. 6.5 inches long, and shall permit drawing circles from 0.062 inch to at least 5 inches in diameter. One leg of the compass shall be provided with a removable and adjustable needle, and the other leg shall have an interchangeabl
27、e pen holder and pencil holder. holder or the pencil holder shall be held firmly in place without movement when tightened. pen blades conforming to ruling pens, above. The pencil holder portion shall accommodate leads conforming to the paragraph on pencil lead above. The large bow compass shall be b
28、etween 6 and The pen The pen holder portion shall accommodate Protractor. Protractors shall be type I semicircular, class A, Protractors shall be of brass or plastic. 8-inch. Numbers may be slanted in the direction of increase. The outer row of numbers on the graduated arc shall read clockwise and t
29、he inner row of numbers shall read counterclockwise. Brass protractors shall be flat and shall be between 0.031 and 0.062 inch thick except that 4.25-inch protractors shall be more than 0.015-inch, but less than 0.062 thick. The horizontal axis shall be along either edge of the crossbar. on the cros
30、sbar to indicate the vertical axis of the protractor. The line shall be formed by the same method as that used for the graduations. A vertical line shall be formed Plastic protractors shall be flat and shall be between 0.062 and 0.125-inch thick. Graduations shall be on the bottom surface of the pla
31、stic and shall be readily distinguishable through the thickness of plastic. protractor but shall be in reading position when the graduated surface is placed in contact with the drawing, map, or other work being performed. Letters and numbers may be on either surface of the The outer edge of the arc
32、shall be graduated in degrees so that the zero and 180 degree marks are on the horizontal axis of the protractor. horizontal axis, the graduations may be extended below that axis. The graduation marks that extend below the zero and 180 degree marks of the horizontal axis are the arc extensions. When
33、 the upper edge of the crossbar forms the Triangle. This commercial item description covers type I transparent plastic triangles, class A (30 - 60 degree angle, size 6-inch) and class B (45 degree, 4-inch). the thickness specified in table II. The triangles shall be plastic with The angles shall be
34、within f2 5 Licensed by Information Handling ServicesA-A-52034A 66 9999974 0064309 3 A-A-52034A minutes of the angle specified. The outside or ruling edges shall be straight and true within +0.003 inch. The surfaces of the triangle shall be flat and true within 0.010 inch. TABLE II. Triangle Thickne
35、ss. Size (inches) Thickness (inch) L/ 4 6 8 10 12 14 16 18 0.05 to 0.09 .o5 to .o9 .o5 to .o9 .o7 to .11 .o7 to .11 .O7 to .11 .O9 to .13 .O9 to .13 - i/ These are thickness limitations, not commercial standard thicknesses. Contour ruling Den. The contour pen shall consist of a pen blade assembly at
36、tached to a thin rod which rotates in a tubular handle. The pen shall be constructed so that the blades are offset to the centerline of the handle and swivel without binding. device shall hold the blades in a fixed position and a knurled screw shall permit adjustment of the blade points. to the size
37、 and design shown in figure 1. A locking The pen shall conform Railroad ruling Den. The pen shall consist of two pairs of pen , handles with a tubular handle constructed so that the pairs of pen blades shall turn freely or remain fixed on the handle as desired. The pen blades shall be curved so that
38、 the points are eccentric to the center line of the handle, similar to the design of a contour pen in order that the pen blades will readily follow sharp curves. The overall length of the pen, including the handle shall be 5.25 inches. The pen shall be designed to provide lightness, good balance, an
39、d ease in handling. Curve. Curves shall be furnished by pattern numbers 1 or 2 (see figure 2), in sets or individually as specified. The size of the curves shall be the size regularly produced by manufacturers of this type of curve. Curves shall be methacrylic plastic or acrylic plastic. Large frict
40、ion comDass. The large friction compass shall be between 6 and 6.5 inches long, and shall permit drawing circles from 0.062 to not less than 5 inches in diameter. The friction shall be sufficient to hold the dividers in any position during normal use. One leg of the compass shall be provided with a
41、removable and 6 Licensed by Information Handling ServicesA-A-52034A bb 9999974 0064330 T A-A-52034A adjustable needle and the other leg shall have an interchangeable pen holder and pencil holder. shall be held firmly in place without movement when tightened. The pen holder portion shall have pen bla
42、des conforming to ruling pens, above. The pencil portion shall accommodate leads conforming to pencil leads, above. The pen holder or the pencil holder Lengthening bar. A lengthening bar or beam not less than 3.5 inches long shall be provided for use with the large compass to permit drawing larger c
43、ircles than are normally possible with the compass alone. The lengthening bar or beam shall fit into the socket for the pen or pencil attachment, and the pen or pencil attachment shall fit into the lengthening bar or beam. Small divider. The small divider shall be similar to the small bow compass sp
44、ecified in this document, except that both legs shall have adjustable and replaceable needle points as specified herein. Large divider. The large divider shall be friction type and shall be between 6 and 6.5 inches long. Both legs shall be equipped with adjustable and replaceable needles as specifie
45、d in needle points cited herein. The range, or spacing between the points shall be continuously variable from less than 0.062 inch to more than 2.5 inches. friction shall be sufficient to hold the dividers in any position during normal use. Movement shall be free without binding or tight spots. The
46、Center horn. The center horn shall be a flat disc of transparent plastic mounted in a metal or plastic rim. be between 0.50 and 0.625 inch in diameter. The rim shall be equipped with three equally spaced needle-sharp pins protruding between 0.046 and 0.078 inch below the lower surface of the metal r
47、im. The plastic disc shall Additional Darts and Dencil lead holders. Additional parts and pencil lead holders may be in two separate holders or they may be combined into a single holder. friction or threaded type removable cap. not less than the following items: Each holder shall be provided with a
48、The holder shall contain 3 Pencil leads. 3 Needle points. 2 Adjusting T-bolts and nuts (when required). 2 Eye bolts and clamp nuts (when required). Screwdriver. When required for making adjustment on any instrument in any set, a screwdriver of the proper size shall be furnished with the set. 7 Licen
49、sed by Information Handling Services. - A-A-52034A bb 9999974 0064311 1 A-A-52034A Remlatorv reauirements: section 23.403, the Governments policy is to acquire items composed of the highest percentage of recovered materials practicable, consistent with maintaining a satisfactory level of competition without adversely affecting performance requirements or exposing the suppliers employees to undue hazards from the recovered materials. In accordance with Federal Acquisition Regulation, Certification of commercial item. The contractor shall certify that the product offered to the Governm
