1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provid
2、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.3.4 Surface finish.- AU. castings, forgings, molded or welded parts, shazl be thoroughly cleaned and free from sand, dirt, fins, sprues, scale, flux or other harmful or extraneous materials. External surfac
3、es between matching parts shall be precision finished by machining, grinding, or scraping to provide the necessary tolerances. 3.3.5 Painting.- Unless otherwise specified the machine shall be painted in accordance with the manufacturers standard commercial practice ( see 6.2) o 3.3.6 Threads.- AU. t
4、hreads shall be in accordance with National Bureau of Standards Handbook H28. 3.3.7 Electrical connections .- Electrical connections shall be lil accordance with NIDBA Standards. 3.4 Component parts.- “he machine shall be composed of the components listed below. 3-4.1- Column and base.- The column a
5、nd base shall be a ribbed casting of cast iron or iron aUoy, or a rigid steel or iron fabricated unit with access doors or readily removable. covers fur servicing the drive motor, main drive clutch, and adjusting nechanism. The colwg shall have square or dovetail sidesaccurately ground and scraped f
6、or vertical travel of the knee and shall be equipped with adjustable gibs. base shall have-no less than four adjusting bolts for securing the machine. The 3.4.2 Knee.- The knee shal be properly ribbed to resist torsional strain and offset thrust loads. of cast iron or cast iron alloy. The knee shall
7、 be accurately fitted to the column sudes with adjustable gibs, and equipped with wipers or other means for preventing dust and chips from entering the ways. The handwheel for raising and lawering the kne shall be such that it is automticaUy disengaged when pawer feed or rapid traverse is engaged. A
8、 micrometer dial, graduated k thousandths, shall be provided $0 measure vertical movement. 3.4.3 Saddle.- The saddle shall be a casting of iron or iron aloy and shall be accurakteiy twelve inches long by five inches wide- by three inches thick. tate clamping. A roughing cut and finishing cut shall b
9、e inade The sample my be drilled to facili- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-on each surface of the test sample. The depth of the rough- I I ing cut shall not be less than .180 inches. used, feed rate and cutting speed for both the rou
10、ghing and finishing cut shall be at the contractors discretion, completion of both roughing and finishing cuts the sample shall be tested according to 4.3.3.1. 4.3.3.1 Test tolerances 4.3.3.1.1 Surface finish.- Al1 finish machined surfaces shall not exceed 70 micro-inch RMS finish and shall be free
11、from widely spaced revolution marks caused by the cutter. 4.3.3.1.2 Squareness.- The finish machined test piece shall be tested.for squareness. The type cutter Upon Adjacent sides shall be square with 4.3.3.1.3 Flatness.-Each one of the six finished machined surfaces shall be placed on a precision s
12、urface plate and checked end to end for high and law surface areas and diagonal rocking conditions. any one point. Concave conditions shall not exceed .O01 inch at Convex conditions are not acceptable. 4.3.3.1.4 Parallelism.- The thickness of each two sides of the finish machined test piece shall be
13、 checked nith a micrometer of correct size or placed on two parallels mounted on a surface plate and checked by means of an indicator attached to a height gage. Readings shall be taken at each end corner. Variation shall not exceed .O01 inch based.on non-accumulative readings. 4.3.4 Tolerance test.-
14、 The machine shall be checked for tolerances according tothe illustration listed in table IY. 4.3.5 Packaging test.- The packaged machine shall be inspected 4.3.6 Retest.- Rejected mchines shall not be resubmitted for inspection without furnishing full particulars concerning previous rejections and
15、measures taken to overcome the defects to the govern- ment insp ctor . 5. PIZEPARATION FOR DELIVERY 5.1 The milling machine shall be prepared for delivery in accordance with MiL-P-4574 (see 6.2). L I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Pr
16、ovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TAEU BV TEST PROCEDURES AND TOLERBNCES FOR HORIZOBTBL MILLING EMCHIEIE ?EST iKlMBER AND LPPLICAT ION Teat No. 1 hrSling Table Flat an level Longitudinally T08t BO, 2 Alignment of Arbar Support with Spiadl
17、e TEST DUGRAM +- & I +t Uith rpirit level at A, 8, and C. Tablo rot wntral j or - 0.001 in. er foot With levol at 90 Teat at D, E, and F + or - 0.0005 h. per foot: Elu, 0.001 inah Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-U-9925 Iq 9979906
18、02q3973 b TESP MER Am) APPLICATIOI rest NO. 3 3plndle end %riphery and kce Run Out ?EST No. 4 ipinle Run. Qut Test No. 5 Table Top ParalXe1 vithm SpindU TEST DIAGRAM 1 Em) VIEY SIDE VIP% Face Rirn Out lkx. 0.0002 inoh L1/4 inches from SpMe laa. ax. .0003 inoh 12 nchss from spindle woso &x. 0.601 inc
19、h I Max. 0.001 inch in 12 hOh8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-77L5 34 m 777770b 0243774 MIL-M-9915 (UsAl?) EST NTM3E3 AND rPPLICATION rest No. 6 ?Slots Square rith Top of Table rest NO. 7 Cross Movement Parallel with Spindle TE
20、ST No. 8 Parallelism. of Overarm with Spindle in Vertical (A) and Horizontal (B) Plane TABLE TEST DIAGRAM I - I I I I I I I I SIDEVIEU TOP VIEW A V - TOLERANCES Msx. 0.001 per inch ihx. 0,001 inch h 12 inch00 kx. 0.001 inch in 18 hohes GPO 812116-2 Provided by IHSNot for ResaleNo reproduction or net
21、working permitted without license from IHS-,-,-_- MIL-M-77L5 34 W 7979906 0243775 T W TARE TmlrtJMmm APPLICATIOM Test . 9 Table Top Sqmm With Vertiaal Movement of he0 n a Plana Par.1101 with Cylindrfca Square, or TriSquare Column using bok 2 places 900 apart. Test Fio. 10 Vertical Movement Parallel
22、with Column Face Test No, 11 Rise and Fall of Table in Longitud ha1 Movement Check both directions from spindle f TEST DURAM t I- 1 II I 0.m inch In 18 inchei Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-M-7715 3Ll 7777706 0243776 1 !EST NUMB
23、ER AND ,PPL.ICAT ION !est No. 12 “Slots Parallel rith Table Ilovement rest No. 13 I-Slots Square fith Spindle by Tramming Pest No 14 %vernent of Knee hen Slamp is L.ocked TABLE IV TEST DIAGRAM TOP VIEW -Er- n TOLERBflCES &x. 0.001 inch in 18 inches Max. 0.001 inch in 18 inches kx. 0.002 inch in 36 i
24、nches kx. 0.001 inch Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-!J!EsTI!uMEEaAND 1 APLiCATION Test No. 15 Back Lash in Lead Screws Lead Error of Ali Feed Screws TOIERANCES READ ON DIUS Table Screw Crass Feed Longitudinal - 0.005 in. max. Vertica
25、l Feed Screw - - - - 0,008 in max, Max. Error - - - + or - 0.001 in. in I2 inches Accumulathe Error in tobi length - - + .o01 - 0002 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
