1、L c Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Natick Research, Development and Engineering Center, Natick, MA 01760-5014 by using the self-addressed Standardization Document Impr
2、ovement Proposal (DD Form 1426) appearing nt the end of this document or by letter. MIL-L-3931K MIL-L-3931J 7 April 1981 MILITARY SPECIFICATION LASTS, FOOTWEAR, SHOE, MENS, U.S. MIL-1 This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Sc
3、ope. This document covers plastic footwear lasts used in the manufacture of oxford and service shoes. 1.2 Classification. The lasts shall be of one type in the following sizes and widths as specified (see 6.2). TABLE I. Schedule of sizes S chedu le of widths 4 4% 5 5% 6 6% 7 7% 8 8% 9 9% 10 10% 11 1
4、1% 12 12% 13 13% 14 14% 15 XN -x xx xx xx xx xx x x x x x x x x x x x N xx xx xx xx xx xx x x x x x x x x x x x R xx xx xx xx xx xx x x x x x x x x x x x W xx xx xx xx xx xx x x x x x x x x x x x xw xx xx xx xx xx xx x x x x x x x x x x x AMSC N/A FSC 8335 DISTRIBUTION STATEMENT A. Approved for publ
5、ic release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-393LK 83 M 979790b 037454b O 2. APPLICABLE DOCUMENTS if 2.1 Government documents. Unless otherwise specified, the following docu- ments of the issue in effec
6、t on the date of invitation for bids or request for proposal, form a part of this document to the extent specified herein: SPECIFICATIONS FEDERAL .V-T-276 - Thread, Cotton CCC-C-467 - Cloth, Burlap, Jute (or Kenaf) PPP-B-640 - Boxes, Fiberboard, Corrugated, Triple-Wall STANDARDS FEDERAL FED-STD-751
7、- Stitches, Seams, and Stitchings MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes MIL-STD-129 - Marking for Shipment and Storage MIL-STD-130 - Identification Marking of U.S. Military Property MIL-STD-147 - Palletized Unit Loads MIL-STD-731 - Quality of Wood Members
8、 for Containers and Pallets (Copies of documents required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publications. Uniess otherwise specified, the following docu- ments of the
9、 issue in effect on the date of invitation for bids or request for proposal, form a part of this document to the extent specified herein. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 1248 - Polyethylene Plastics Molding and Extrusion Materials E 18 - Rockwell Hardness and Rockwell Superficial
10、 Hardness of Metallic Materials (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Technical society and technical association documents are generally available for reference from libraries. technical groups and
11、using Federal agencies . They are also distributed among 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-3931K 2.3 Order of precedence, In the event of a conflict between the text of this document and the references cited herein (except for a
12、ssociated detail specifications, specification sheets or MS standards), the text of this document shall take precedence. Nothing in this document, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Guide sample. Samples, when f
13、urnished, are solely for guidance and information to the contractor (see 6.3). appear in the sample, in which case this document shall govern. Variations from this document may 3.2 First article. When specified in the contract or purchase order, a sample shall be subjected to first article inspectio
14、n (see 4.3, 6.2, and 6.6). 3-3 Material (see 6.7). 3.3.1 Polyethylene blocks. The lasts shall be made from polyethylene blocks. ethylene without fillers, conforming to types III or IV, category 4 or 5 of ASTM D 1248 except that the density of type IV shall not exceed 0.965. The color shall be the st
15、andard color used by the contractor. made from virgin material, or reground scrap material of the same composition produced by regrinding clean unburned scrap produced in the fabrication of last blocks, finished lasts, and imperfect lasts. Scrap containing dirt or other foreign material shall not be
16、 used. The polyethylene blocks shall be made from solid high density poly- The blocks shall be 3.3.2 Metal hinges. The metal hinges shall be a commercial type made of steel and zinc chromated to resist moisture. 3.3.3 Hinge pins. The hinge pins shall be made of steel wire and shall be heat treated t
17、o a hardness value of 45 to 50 Rockwell C scale of ASTM E 18. The pins shall be not less than 15/64 inch nor more than 19/64 inch in diameter. The pins shall be countersunk under the surface of the sides of the lasts. mechanically peened. The pins shall be zinc chromated to resist moisture and shall
18、 be 3.3.4 Thimbles. The thimbles shall be manufactured from steel sheet or tubing stock and shall be heat treated to a hardness value of 55 to 88 Rockwell B scale of ASTM E 18. The thimbles shall be of the drawn, split, or swaged tubing types. partially closed bottom, and shall be the locked-in type
19、. thimbles shall correspond to the following when tested in 4.4.1. All thimbles shall be full-flanged with a closed or Dimensions for last Inside diameter Overall length Depth of hole Wall thickness Flange diameter 0.500 + 0.046 inch 1.625 0.063 inches . 1.500 7 0.063 inches 0.0475-+ 0.095 inch 0.75
20、0 - +0.063 inch 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-3731K 83 777770b 0374548 L1 W MIL-L-3931K 3.3.5 Heelplates, The heelplates shall be not less than 3-1/8 inches long on size 8R, shall measure proportionate to normal grade on oth
21、er sizes, and shall have a 1/2 + 1/32 inch hole in the center for insole tacking and five countersunk nail holes as specified in 3.5.3. The heelplates shall be made from either hot-galvanized or electro-galvanized sheet steel 0.050 + 0.005 inch thick and shall be treated to a hardness value of 48 to
22、 67 Rockwel1.B scale of ASTM E 18. 3.3.6 Heelplate attaching nails. The nails for attaching the heelplate on the last shall be 15 or 16 gage, 5/8 to 3/4 inch long, barbed, iron wire nails - - with 1/8 + 1/32 inch diameter flat heads and ringed chisel points; and shall not be cement coated finish whe
23、n tested as specified in 4.4.1. 3.3.7 Ink. Ink for marking the lasts shall be black, shall not blur, shall meet the marking adhesion requirements in 3.9.1, and shall, be set permanently into the lasts by heat. 3.4 Models, patterns, and templates. 3.4.1 Turning models, Turning models for each of the
24、sizes and widths required will be furnished by the Government (see 6.4). Turning models shall be-in whole sizes in widths kN, N, R, W, XW, with the final meakements for the lasts of that size plainly marked on each model. Only two sizes shall be turned from any model up to size 12, namely, the model
25、 size and one-half size up. No last shall be turned from a model of a different width. Sizes larger than 12 shall be turned from the size 12 models. 3.4.2 Replacement of turning models. Models worn to the point of unserviceability in the production of properly graded lasts will be replaced by the Go
26、vernment. All models shall be returned to the Government at the close of the contract. Worn mdels that need replacement shall be marked “Uns e rv i ce ab le“. 3.4.3 Last bottom patterns. Necessary turning bottom patterns and finished bottom patterns marked to indicate all pertinent measurements in g
27、eometric. points, will be loaned to the contractor by the Government (see 6.4). When prehinging method is used, the turning bottom patterns do not apply. 3.4.4 Templates. Templates for use in checking the lasts will be loaned to the contractor by the Government (see 6.4). 3.5 Construction. 3.5.1 Hin
28、ge cutting, slotting, and assembly. The hinge V-cut and circle sawcut shall correspond to the hinge pin holes so that the last, with a correctly inserted hinge, will open and close in a satisfactory manner. All inside sharp corners on the plastic lasts shall have a slight radius made by running over
29、 the edge with a hot wire to eliminate stress risers made by cutters during the hinge cutting operation. The use of a radius ground cutter 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-3931K 83 7779906 037q5Li9 b MIL-L-3931K to eliminate st
30、ress risers shall be permitted. As an alternate, the equipment and method used for prehinging is permitted. 3.5.2 Thimble hole. The thimble hole shall be bored to such a size that when the thimble is inserted in the last, it shall be locked into the plastic. Thimbles shall be countersunk on lasts. O
31、n sizes 7-1/2 through 12 (all widths), the thimble hole shall be centered 1-1/2 + 1/16 inches from the back of the last top, On sizes below 7-1/2 and above 12, the holes shall be centered 1-3/8 and 1-5/8 2 1/16 inches, respectively, from the back of the last top. 3.5.3 Heelplating. The heelplate on
32、the finished last shall be flush with but not overlaying the outside edge of the last. A narrow margin of plastic, having a maximum width of not more than 1/16 inch in the curved area beginning 3/8 inch from the breast line of the plate, is acceptable. The margin of. plastic in the area 3/8 inch fro
33、m the breast line on each side of the plate is not limited. The breast of the heelplate shall butt up to the plastic. The heelplates shall be attached with five nails specified in 3.3.7. The position of the heel nails shall be according t commercial practice with five countersunk nail holes punched
34、not less than 3/8 inch nor more than 5/8 inch from the edge of theplate; except that the two front nail holes shall be not less than 3/16 inch nor more than 3/8 inch from the breast of the heelplate. The side nails shall be located equidistant between the breast nails and the back nail. located appr
35、oximately in the center of the heelplate, measuring both from the breast to the end of the heelplate and from side to side. The heelplate shall be cupped to conform to the contour of the heel seat of the last. The heelplate shall be punched with a 1/2 2 1/32 inch tack hole 3.5.4 Heel and toe making.
36、 The heel and toe shall be shaped following the heel and toe profile templates as specified in table II. A tolerance of 1/2 size either upward or downward will be permitted in the applicable width for the toe. TABLE II. Heel and toe templates Sizes Widths 4 4% 5 535 6 6% 7 7% 8 8% 9 9% 10 10% 11 11%
37、 12 12% 13 13+ 14 14% 15 - 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 N 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 R 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 W 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 3
38、5 36 XFI 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 NOTE: Identical template numbers are for the same template regardless of width. The adjacent numbered templates are to be used for the tolerance for a given template, i.e., the tolerance for temhlate 10 is 9 and 11. 5 Prov
39、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-6 - - VIL-L-3q3LK 83 a 77Ob 0374550 2 a MIL-L-393 1K 3.6 Measurements and grading. The contractor shall check the turning models but shall make no modifications except for slight adjustments to fit the turn
40、ing model bottom to the paper last bottom patterns furnished by the Government when this may be necessary due to swelling of the wood. The finished lasts shall conform to the templates listed in table II to the measurements listed in table III. Thickness of toes shall grade 10 points between whole s
41、izes and 10 points between widths. The tolerance for the finished stick length shall be + 1 point and for ball, waist, instep, and heel girth shall be + 2 points. measurements of-f inished last bottom patterns furnished by the Government with tolerance of -t 1/32 inch in length and 2 1/48 inch in wi
42、dth. except toleracesfor bottom length and width, shall be taken by means of sticks and tapes whose calibrations are geometrically graded and which will be loaned by the Government (see 6.4). Finished last bottoms shall conform to All dimensions, TABLE III. Geometric measurements of U.S. MIL-1 lasts
43、 (see 6.5) Sizes Width 4 4% 5 5% 6 6% 7 7% 8 8% 9 9% XN- Ball - 980 985 990 995 1000 1005 1010 1015 1020 1025 1030 Waist - 977 982 987 992 997 1002 1007 1012 1017 1022 1027 Instep - 995 1000 1005 1010 1015 1020 1025 1030 1035 1040 1045 Heel - 1134 1139 1144 1149 1154 1159 1164 1169 1174 1179 1184 Le
44、ngth - 1078 1083 1088 1093 1098 1103 1108 1113 1118 1123 1128 Width 10 10% 11 11% 12 124 13 134 14 1% 15 XN- Ball 1035 1040 1045 1050 1055 1060 1065 1070 1075 1080 1085 Waist 1032 1037 1042 1047 1052 1057 1062 1067 1072 1077 1082 Instep 1050 1055 1060 1065 1070 1075 1080 1085 1090 1095 1100 Heel 118
45、9 1194 1199 1204 1209 1214 1219 1224 1229 1234 1239 Length 1133 1138 1143 1148 1153 1158 1163 1168 1173 1178 1183 -.%4+ I 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-L-3731K 83 7999906 0374553 4 W MIL-L-3931K TABLE III. Geometric measurem
46、ents of U.S. MIL-1 lasts (see 6.5) (contd) Sizes Width 4 4% 5 5% 6 6% 7 7% 8 8% 9 9% N- Ball 995 1000 1005 1010 1015 1020 1025 1030 1035 1040 1045 1050 Waist 992 997 1002 1007 1012 1017 1022 1027 1032 1037 1042 1047 Instep 1010 1015 1020 1025 1030 1035 1040 1045 1050 1055 1060 1065 Heel 1135 1140 11
47、45 1150 1155 1160 1165 1170 1175 1180 1185 1190 Length 1075 1080 1085 1090 1095 1100 1105 1110 1115 1120 1125 1130 Width 10 10% 11 11% 12 12% 13 13% 14 14% 15 N- Ball 1055 1060 1065 1070 1075 1080 1085 1090 1095 1100 1105 Waist 1052 1057 1062 1067 1072 1077 1082 1087 1092 1097 1102 Instep 1070 1075
48、1080 1085 1090 1095 1100 1105 1110 1115 1120 Heel 1195 1200 1205 1210 1215 1220 1225 1230 1235 1240 1245 Length 1135 1140 1145 1150 1155 1160 1165 1170 1175 1180 1185 Width 4 4% 5 5% 6 635 7 7% 8 8% 9 935 R- Ball 1015 1020 1025 1030 1035 1040 1045 1050 1055 1060 1065 1070 Waist 1012 1017 1022 1027 1
49、032 1037 1042 1047 1052 1057 1062 1067 Instep 1030 1035 1040 1045 1050 1055 1060 1065 1070 1075 1080 1085 Heel 11411146 1151 1156 1161 1166 1171 1176 1181 1186 1191 1196 Length 1077 1082 1087 1092 1097 1102 1107 1112 1117 1122 1127 1132 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-3931K TABLE III, Geometric measurements of U.S. MIL-1 lasts (see 6.5) (contd) Sizes Width
