1、Standard Parts PENETRATION GAGING - TYPE 1 (PHILLIPS) CROSS RECESS DIAL GAGE EXCEPT NUUERALS READING COUNTER- CLOCKWISE GAGE POINT IN ZERO GAGE POINT IN GAGING POSITION POSITION PENETRATION GAGE 1.688 _1 I No. 1 0.012 0.020 0.0880 0.376 0.562 No.2 0.018 0.031 0.1420 0.376 0.562 No. 3 0.562 0.376 0.3
2、130 0.062 0.031 No.4 0.562 0.376 0.1100 0.037 0.022 All dimonriom or. givan in inch-. MALF SECTION A-A GRIN0 SQUARE wtTn AXIS GAGE POINT ENLARGED POINT DETAIL Specified above are gage points and gage heads to be used for cross recess penetration gaging. The penetration gaging depth values (see dimen
3、sional tables for respective head type) are predicated on the gaging of plain finish (unplated or uncoated) screws. However, the penetration values are suitable for the gaging of screws having coating thickness up to and including .0003 inch on significant (Contd. on Page 2-130.02) NOV 1981 PRlNiiD
4、IN Z.5.A. PAGE 2-130.01 Standard Parts GENERAL, (Contd. ) surfaces. Screws having heavier coatings, which fail to meet the penetration gaging requirements, must be stripped of finish and be gaged in the plain condition. Penetration is gaged relative to a reference plane defined by the intersection o
5、f the edge of the recess wings with the top surface of the screw head. This plane is the same as the top surface of a flat head screw but is somewhat below the topmost portion of heads which have rounded top surfaces. Knife edges or tapered ridges on the gage head are used to est+blish the reference
6、 plane. A counter-clockwise reading dial gage is used to indicate the penetration of the gage into the recess. The gage must be zeroed on a flat surface. Driveability Test - For Referee Purposes “Cam Out Test of Cross-recess Drive Screws: The test involves clamping the shank of the test screws in a
7、clamping device, with a minium of two full threads eiposed, inserting a production driver bit and applying a constant end load of ten pounds daed weight. For the recess to be acceptable, the bit must not raise more than . 015 in. (.4mm) when a torque equal to seventy percent of the minimum torsional
8、 strength of the screw is applied. (A test fixture is located at Physical General Testing, Central Laboratory Services, Metallurgy Department. ) The minimum torsional strength of the screw is to be obtained from the applicable specifications, i. e., ESS-MlA16O-A for tapping screws, or if not availab
9、le there, it is to be determined by testing sample screws. A sample size of ten is recommended to determine acceptability. .L PAGE Z- 130.02 PRlUTECl ! U.S.A. NOV 1981 Standard Parts PENETRATION GAGING - NPE STANDARD DIAL GAGE EXCEPT NUMERALS READING COUNTER- CLOCKWISE GAGE POINT IN ZERO GAGE POINT
10、IN ClGlNG POSITION POSITION PENETRATION GAGE 1 A (POZIDRIV) CROSS RECESS - SECTION A-A .“L R Tdmoec0.005 unlnr orherviw however, any equivalent means may be used. INDEXING PLATE WITH SLOTS FOR SCREWS musT BE PARALLEL SHARP CORNER n GAGING WING GAGING HEXAGON HEAD GAGING HEXAGON WASHER HEAD TYPICAL G
11、AGING FIXTURE (Continued) APR 1967 PRINTED IN U.S.A. PAGE Z- 134.01 FORD MOTOR COMPANY PRODUCT ENGINEERING STANDARD PARTS ACROSS CORNER GAGES AND GAGING FOR HEXAGON HEAD SCREWS (Contd) To check hexagon head screws an ihtial reading shall be taken with the gaging ring placed on the indexing plate. Th
12、en, with the screw and the gaging ring placed in the fixture, a second reading is taken. The difference between the two readings is equal to the protrusion ffPff of the head beyond the gaging ring. To check hexagon washer head screws, the gaging procedure is exactly the same as for checking hexagon
13、head screws except that the difference between the two readmgs (X) in- cludes the washer thickuess. Therefore, it is necessary to subtract the thickuess of the washer portion from the “X“ dimension to obtain the protrusion ffPc of the hexagon beyond the gaging ring. PAGE Z- 134.02 PRlhlTED IN U.S.A. APR 1967
