1、 GLOBAL MANUFACTURING STANDARDS STANDARD NUMBER : w - GX2 ISSUE DATE: 19991201 REV: Printed copies are uncontrolled . Page 1 of 1 GAUGE PROCUREMENT - GENERAL REQUIREMENTS 1. Purpose This standard shall determine some general requirements for gauge procurement. 2. Reference ASME Y 14.5M - 1994 ASME B
2、 46.1 - 1995 3. Definitions 4. Technical content 4.1. Heat treat ment and surface finish. All functional faces, locating faces, rest faces and rails shall be hardened to 60 - 65HRC or equivalent to provide wear resistance. Centers and V - blocks shall be provided with tungsten carbide or equivalent
3、material to provide wear resistance. All materials shall be dimensionally stable. Castings, weldments, and steel details may require stress relieving to eliminate internal stresses. All non working surfaces to be suitably protected with rust preventive coating or primed and p ainted to Ford spec. (R
4、AL5.000). Unless otherwise specifically required, surface roughness values should be selected in accordance with the following guidelines: GLOBAL MANUFACTURING STANDARDS STANDARD NUMBER : w - GX2 ISSUE DATE: 19991201 REV: Printed copies are uncontrolled . Page 2 of 2 SURFACE FINISH SPECIFICATIONS Ap
5、plication Roughness value in Ra = m Gauge tolerance in mm Machining Contact faces of “GO - NO GO“ limit gauges 0,4 Gauge classes 4 - 9 Lapping 0,05 0,0008 Lapping Master reference and setting gauges 0,1 0,0010 - 0,0015 Lapping 0,2 0,002 and above Lapping Gauge locating surfaces 0,4 - 0,8 0,005 - 0,0
6、15 Grinding Other contacting faces 0,8 0,010 - 0,040 Grinding Non working faces 6,3 0,5 Finish cutting 4.2. Design specifications . 4.2.1. Scope The purpose of this standard is to provide a uniform application of acceptable gauge design practices. This standard is binding for all manufacturing engin
7、eering and quality control activities within Ford Automotive Operations and for all outside design offices working for these activities. 4.2.2 General All design s shall conf orm to Ford Global Manufacturing Standards. Refer to latest issue of specific Global Manufacturing Standards . GLOBAL MANUFAC
8、TURING STANDARDS STANDARD NUMBER : w - GX2 ISSUE DATE: 19991201 REV: Printed copies are uncontrolled . Page 3 of 3 4.2.3 Requirements for design and manufacture. Engineering designs purchased by Ford shall be complete including layouts, assemblies and details drawn according to the Ford Engineering
9、CAD & Drafting Standards. Final drawings shall be approved as conforming to Ford Standards by the appropriate activities. On completion of manufacture one set of prints shall be delivered with the gauges. 4.3. Identification of gauges and masters . 4.3.1 Gauges are marked with: Gauge No. - Ford draw
10、ing or Manufacturing Standard No. - and unique serial number provided by each Ford manufacturing plant. If a master is required for setting the gauge, the gauge is marked with “use with master 024 - S - NK - .“ Additional marking instructions shown on the drawing must be observed. Gauge details not
11、permanently attached such as sweeps, plugs, handles etc., must be marked with gauge - no. and detail - no. 4.3.2 Additional marking according to type of gauge as follows: Limit gauges : Upper and lower limit dimensions to be checked and marked as “GO“ and “NO GO“ Thread limit gauges or thread gauges
12、 with depth notches : Thread designation. Mark as “GO“ and “NO GO“ Depth dimension on gauge with appropriate notching. Multi - purpose gauge : Gauges for checking multiple characteristics and gauges with multiple manual probes shall be provided with a sketch or diagram indicating the proper gauging
13、sequence a nd probe selection . On measuring equipment which requires individual gauging elements to be changed for the checking of different but similar production parts, the necessary set up and gauging instructions must be marked on the equipment. For electronic gauges with pc based computers, th
14、ese instructions can be incorporated in the gauge program and displayed on the operator interface screen. GLOBAL MANUFACTURING STANDARDS STANDARD NUMBER : w - GX2 ISSUE DATE: 19991201 REV: Printed copies are uncontrolled . Page 4 of 4 4.3.3 Master gauges are marked with: Master - No. - Ford drawing or Manufacturing Standard No. - and uni que serial number provided by each Ford manufacturing plant. Actual size with min or max as appropriate. “Use with gauge 024 - Z - NK - .“ 4.3.4 Manner of marking All gauges must be permanently marked on a suitable part of the gauge
