ARMY GGG-B-121 B-1964 BAR SINE PLATE SINE (AND FIXTURES)《(固定装置)正弦与板正弦杆》.pdf
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1、F-43-aG GGG-B-LZLB 52 m qvwc/4 0043447 rn . A ! GGG B 121b -. - _I_-_.-_ - - June 4, 1964 SUPERSEDING ht. Fed. Spec GGG-B-00121a(GSA-FSS) October 28, 1963 FEDERAL SPECIFICATION BAR, SINE; PLATE SINE (AND FIXTURES) Clris specification was approved u tlie Bomniissioner, Federal Supply Serv- (ce, Gette
2、rall Xercices Admiidstration, for tlie tise of all Federal agencies. .1. SCOPE AND CLASSIFICATION 3.1 Scope. This specification covers re- quirements for sine bars, plates, and fistures. They we for use in inspection and layout work. 1.1.1 Fede?-ai? specif“at2on covemge. Fed- em1 specifications do n
3、ot include all varieties of t.he commoclit as indicated by the title of the specification, or which are commercially avail- able, but are intended to cover only those geii- erally used by the Federal Government. 1.2 Classification. 1.2.1 Xypes, grades, and classes. Sine bars, plates, and fixtures co
4、vered by this specification shall be of the following types, grades, and classes, as speced (see 6.1) : Type L-Sine bars, Grade A.-Laboratory. Class 1.-Lapped. Class 2.-Groiiiid. Grade B.-Commercial, Class 1.-Lapped. Class 2.-Ground. Type 11.-Sine plates. Grade A.-Laboratory. Class 1,-Lapped. Class
5、2.-Grouiicl. Class I.-Lappecl. . Class 2.-Ground. Type 111.-Sine bar fixtures. Grade A.-Laboratory. Class 1.-Lapped. Class 2.-Ground. Grade B.-Commercial. Class 1.-Lapped. Class 2.-Ground. Grade A.-Laboratory. Grade B.-Cominercid. Type N.-Sine plate fistures. Class 1.-Lapped. - General Specifica- ti
6、on. rUlta.?y Specifications : ;ILGP-ll-PreserT.atioii* 3ethods of. 4.1 Sine bur. For any operating setting, including clamped settings, parallelism of cyl- inder axis to the working surface of the base shall be maintained mithin the applicable tol- erance specified (see column 4, table I or 11). 3.7
7、.4.2 Bases. Reference surfaces of bases of sine bar fixtures shall be lapped, ground, or scraped as specified (see 6.1), flat and parallel wit-hin t.lie applicable tolerank specified (sm column 2, table I or II). Specific tolerances shall apply to all areas- mithin one-sixteenth inch from t.he edges
8、 of the finished surfaces. 3.7.4 Accuracy. 3.7.5 Shes. Sine bar fixtures shall be fur- nished in the sizes specified in the invitation for bids (see 6.1). 3.8 Type IV, grades A and B, classes 1 and 2 sine plate fixtures. 3.8.1 Consti*uct2m. Type IV sine plate fix- tures shall consist of a type II si
9、ne plate and a base (see figure 4). Construction shall be such as to provide for smooth adjustment of the sine plate, and if provided with clamping means, construction shall be rigid when sine bar is clamped posit.ion above working surface of the base. In the case of hinged Mures, the diameter of th
10、e pivot cylinder inay differ from that of the cylinder at the free end. FIGURE 4.-Type IV, sine plate fixtures. 3.8.2 Base nzatewhl. Material for sine plate fixture bases shall be in accordance with 3.7.2. 3.8.3 Hardness. Hardness of sine plate fix- ture bases shall be in accordance with 3.7.3. 3,.8
11、.4 Accu?my. Accuracy of she plates for sine plate fixtures and bases for sine plate fix: tures shall be in accordance trith 3.7.4.1. and 3.7.4.2, respectively. 3.8.5 Sizes. She plate fixtures shall be fur- nished in the sizes specified in the invitation for bids (see 6.1). - 3.9 Accessories. Accesso
12、ries for sine bars, plates, or fixtures shall be as specified in the invitation for bids (see 6.1). 3.10 Tolerances for special sizes. For sizes smaller than 5 inches, tolerances for the 5- inch size of the designated grade shall apply. Provided by IHSNot for ResaleNo reproduction or networking perm
13、itted without license from IHS-,-,- / GGG-B-L2LB 52 E 7777774 0043504 b GGG-B-12lb For sizes above 5 inches, other than 10-inch ancl 20-inch sizes, applicable tolerances shall be ob- tained by straight line interpolation between the values in the table or by extrapolation on the straight lines deter
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