ARMY MIL-W-13871 B-1968 WOOD BLANKS FOR SMALL ARMS《轻武器木靶心》.pdf

1、MILITARY S PECIFICATI ON WOD BLANKS FOR SMALL ARMS This Specification is mandatory for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers wood blanks for gunstocks,but-tstocks, handguards, and similar small arms I parts. 1.2 Classification

2、. 1.2.1 Types. Wood blanks shall be furnished in the following tymas specified (see 3.1 and 6.1): Type I - Walnut Type II - Birch 1.2.2 Condition. Wood blanks shall be-furnished in the fQllOWing conditfons, as specified (see 6.1): Kiln-dried Air-dried Green 2. APPLICABLE DOCUMENTS 2.1 The following

3、documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein. SPECIFICATIONS Federal L-P-388 - Plastic Sheet and Strip (Polyolefin) FSC 5510 s THOS DOCUMENT CONTAIKS PACES. ._ T r . Provided by IHSNot for R

4、esaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.4 Moisture content. 3.4.1 Kiln-dried blanks. The average moisture content of kiln-dried blanks shall not be less than 6 percen

5、t nor more than 8 percent when tested as specified in 4.6.2.2. dient of moisture content between core and outer shell shall not vary more than 2 percent. The gra- 3.4.2 Air-dried blanks. Air-dried blanks shall have an average moisture content of not more than 25 percent when tested as specified in 4

6、.6.2.2, maximum moisture content for green blanks and testing there- fore is not required. 3.4.3 Green blanks. There is no specified minimum or 3.5 Casehardening. When blanks are furnished in the kiln-dried condition, test specimens tested as specified in 4.6.2.3 shall be free of severe casehardenin

7、g as illustrated in Figure 2; slight casehardening (i,e., casehardening to the extent that the prongs of the test specimen do not touch each other) shall be permitted in no more than two of the test specimens. 3.6 End coatin . Both ends of each blank, including test cut to final blank form. Any comm

8、ercial type end coating which completely seals end grain and effectively controls end split- ting shall be used except that coatings containing varnish or powdered metal, such as powdered aluminum shall not be permitted. Coatings shall not extend onto the sides of the blank more than three-quarters

9、of an inch from either end. samples, sha -e 1 be horoughly coated immediately after being 3.7 Dimensions. Blanks shall conform to the dimensions and tolerances specified in the contract or purchase order (see 6.1). 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for ins.pection. Unless otherwise

10、mecified in the contract or purchase order, the supplier is risponsible for the performance of all inspection reqGirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government. The Government reserve

11、s the right to perform any of the inspections set forth in the specifica- tion where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-gravity u

12、sing the test methods specified in 4.6.2.1. For moisture content and casehardening testing of kiln-dried blanks, bi -our full size blanks shall b e used -or each kiln charge. Eighteen test blanks shall be identified for test, and 36 for retest, if required. The samples shall be placed in groups of t

13、hree in each kiln charge. blanks for retest, The groups shall be located to represent blanks in the fastest drying and slowest drying areas in the charge and shall be inserted in such a manner that they will be subjected to the same drying conditions as the blanks sur.- rounding them, After completi

14、on of kiln drying, the samples identified for test shall be tested for moisture content and casehardening using the applicable test methods specified in 4.6,2,2 and 4.6.2.3 respectively. Ten blanks shall b e taken from each lot and tested for moisture content using the applicable test method specifi

15、ed in 4.6.2.2, Samples shall be selected to include what appears to be-the wettest material in the lot. 4.4.3 Each group shall contain one blank for test and 2 4.4.4 For moisture content testing of air-dried blanks. 4.5 Examination. 4.5.1 Visual and dimensional. Examination of blanks shall be perfor

16、med in accordance with 4.5.1.1 on each of the sample blanks taken in accordance with 4.4.1. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-1387LB 55 9779706 021LO2 MIL-W-13871B 4.5.1.1 Classification of defects. Classification of defects and

17、 acceptable quality levels (AUS) for examination shall be as specified herein and shall include the following provisions : The Aals are specified as percent defective, be applied to the defect or group of defects listed for that defect number. bj The A& specified for each defect number shall Cat ego

18、ries Defects Inspection Method A&L - Critical None defined Major 101 Unsound or brashy wood, figured or burly grain, checks, splits, shakes, knots, or pinworm holes (see 3.2) 0.65 Visual 3.7) 1.0 Gage 102 improper contour or wave (see 103 improper slope of grain (see 1.0 Vi sual 3.3) Minor 201 Missi

19、ng or im roper end coat- ing (see 3.67 1.5 Vi sual 202 Thickness, under minimum (see 3.7) 1.5 Mea sur e 203 Excessive warpage or shrink- age (Sample blanks which are visually detectable as warped or shrunk shall be classified as defective, When the num- ber of defective blanks exceeds the rejection

20、number, the contractor may demonstrate usuability of the defective blanks by screening and cor- recting the entire lot from which the sample has been taken. The blanks may be planed on both sides to not less than the minimum thick- ness specified in the contract or purchase order. Blanks which have

21、been planed and are accept- able may be returned to the 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ MIL - Wl L 3 71 B 5-7 77 77 Ob O 2 L 1027. MIL-W-1387lB (Continued) Categories Defects represented lot. If in a sampling of the screened and c

22、orrected lot, the number of defective blanks exceeds the rejection number, the lot shall be rejected. If the number of defective blanks is less than the rejection number the lot may be accepted. ) honeycombing on ends of blanks (After all other examinations have been per- formed, approximately 1/8 t

23、o 1/4 inch shall be cut off each sample blank and the blank ends visually examined for checks, splits, shakes or honeycoming. When 204 Checks, splits, shakes or Inspec tion AU Method - 1.5 Vi sua1 the number of defective blanks exceeds the rejection number, the entire lot will be returned to the con

24、tractor who shall cut off 1/8 to 1/4 inch from each end of each blank, screen the entire lot, recoat the ends of accept- able blanks, and return them to the lot from which they were taken. ) 2.5 Vi sual 3.7) 4.0 made to determine compliance with th e requirementa of Section 5. Thickness, over maximu

25、m (see Mea sur e 4.5.2 Preparation for shipment, Examination shall be 205 4.6 Testing . 4.6.1 Test specimens. 4.6.1.1 Specific gravity of English walnut, 4.6.1.1.1 Kiln-dried blanks. One specimen approximately- 2 by 2 inches shall be taken from each sample blank (see 4.4.2). 6 _- .- - -I_- Provided

26、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-WIL-W-13B71B 55 99999Ob 02LL030 b i-. MIL-W -13871 4.6.1.1.2 Air-dried or green blanks. Each sample blank taken in accordance with 4 .4.2 shall b e dried to 6 to 8 percent moisture content. After drying, one spe

27、cimen approximately 2 by 2 by 6 inches shall be taken from each blank, The mois- ture content of the dried sample blanks shall be determined in accordance with 4.6.2.2 and 4.6.2.2.2. 4.6.1.2 Moisture content. 4.6.1.2.1 Kiln-dried blanks. One specimen shall be taken from each of the l t est bl anks (

28、see 4.4.3) in accordance with Figure 3. One-quarter of the length of each specimen shall be cut from each end and discarded, and the remaining middle portion shall be cut so as to remove one-quarter of the origi- nal width from each side, as illustrated i,n Figure 3. The two side pieces shall be use

29、d in determining the moisture content of the shell and the centerportion in determining the moisture content of the core, 4.6.1.2.2 Air-dried blanks. Specimens shall be taken from each sample blank (see 4.4.4) in accordance with Figure 4. The whole test specimen shall be used for determination of mo

30、isture content, 4.6.1.3 Casehardening of kiln-dried blanks. S ecimens shall be taken from each of th e 18 t est bl anks (see t.4.3) and prepared in accordance with Figure 3. 4.6.2 Test methods. 4.6.2.1 Specific gravity. Test specimens prepared in accordance with 4.b.1.1 shall b e weighed and measure

31、d imme- diately after cutting. The weights Shall be determined to an accuracy within k0.2 percent and the measurements to an accu- racy kO.3 percent. The specific gravity shall be calculated as follows: Specific gravity = K(or K1)W LWT Where : W = Weight of specimen at 6 to 8 percent moisture conten

32、t, L = Length of specimen, in inches or centimeters. T = Thickness of specimen, in inches or centimeters. K = 1, when metric units of weight and measurement are used. K1 = 0.061, to be used only when metric units of weight and in grams. English units of measurement are used, 7 Provided by IHSNot for

33、 ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL -W -13871 4.6,2.2 Moisture content. Moisture content shall be determined by the oven-drying method. will not be permitted unless specifically authorized by the contracting officer, Test specimens shall be weighed imme- d

34、iately after cutting, then dried in an oven at 103O C 2O centigrade until approximately constant weight is attained. After drying, specimens shall be weighed as soon as they attain room temperature. The weights shall be determined to an accu- racy within * 0.2 percent, The moisture content shall be

35、calculated as follows: Electric moisture meters Moisture content (percent) = W-F x 100 F Where : W = Initial weight of specimen F = Final weight of specimen 4,6.2,2.1 Kiln-dried blanks, Determinations shall be made using the shell and core sections prepared as specified in 4.6.1.2.1. together shall

36、be determined and recorded as that of the shell, The moisture content of the center portion shall be determined separately and recorded as that of the core, The average of the shell reading and the core reading shall be recorded as that of the blank. The moisture content of the two side pieces 4.6.2

37、.2.2 Air-dried blanks. The moisture content of the whole test specimen taken in accordance with 4.6.1.2.2 shall be determined and recorded as that of the blank, dance with 4.6.1.3 shall be allowed to come to a uniform mois- ture condition of not more than 10 percent and not less than 6 percent and v

38、isual1 examined for evidence of casehardening (see 3.5 and Figure 27, ? 4.7 Rejection, 4.6.2,3 Casehardening. Test specimens prepared in accor- 4.7.1 Examination. Unless otherwise specified herein, individual blanks not meeting the requirements of this speci- fication shall be rejected. The represen

39、ted lot shall be rejected when the number of rejected sample blanks equals or exceeds the rejection number specified in MIL-STD-i05 for the sample size of the lot under examination. requirements of this specification shall be cause for rejection of the represented material. 4.7.2 Testing. Failure to

40、 comply with any of the test 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-5. PREPARATION FOR DELIVERY 5.1 Packing. 5.1.1 Level C. 5.1.1.1 5.1.1.2 Blanks shall be packed in a manner to insure carrier acceptance and safe delivery at destination. A

41、ir-dried or green wood blanks shall be delivered in self contained units as shown in Figure 5. Kiln-dried blanks shall be delivered in self contained units as shown in Figure 5. In addition, kiln-dried blanks shall be protected from the weather by being warpped as described in MIL-STD-147 (Storage A

42、id No, 9) with the excep- tion that polyethylene film meeting Federal Specification L-P-378, type II, class 1, grade B, finish 1 shall re lace the duplex asphal tic laminated waterproof paper (-P-27lp speci- fied. closed trucks. by the contract or order, self contained unit loads shall be marked in

43、accordance with the requirements of MIL-STD-129. Rail or truck shipments shall be made in box cars or 5.2 Marking. In addition to any special marking required 6, NOTES 6.1 Ordering data. Procurement documents should specify the following: Title, number and date of this specification: Type required (

44、see 1.2.1). Condition required (see 1.2.2). Size, dimensions and tolerances required (see 3.7) 6.2 Definitions. Definitions of terms relating to wood characteristics and defects used in this specification may be found in Military Handbook 7 “Lumber and Allied Products“. sedes Springfield Armory Purc

45、hase Description SAPD-200. 6.3 Supersession data. This specification also super- Custodians: Army - WC Navy - OS Air Force - None Preparing activity: (Project Nr 5510-0098) Army - WC 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10 Provided by IH

46、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I -. Top View, Slope of grain in the critical area Shall ncjt exceed 1 imh in 12 inches measured parallel with either side of blank. I -4- - Side View. Grain direct.iori in the critical area may vary from hgrizontal

47、to a slope of 1 inch in 12 Inches in direction shown. Stock Blank-Dimension A Rifles: N1, MlC, MlD, & M14 26 1/2“ * 1“ I Carbines: Mi, M2, & M3 . I 22“ .* 1“ , I hgure 1. Grain Slope in Critlcal Area of Stock Blanks 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without lice

48、nse from IHS-,-,-Not Casehardened Acceptable Slightly Casehardened Severely Casehardened Not Acceptable Figure 2. Casehardening Test Standards Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-337LB 55 7”i77Ob 0233036 7 m Casehardening J Test Specimen I Shell Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I - i4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-W-L387lB 55 9 7777706 02LL038 O I USED -FOR I !i