1、 FECDS C-6 Engineering CAD that is, it is not directly projected from its reference view. See Figure C6.9. 3.13.2 On multiple frame drawings where it is not practicable to place a removed section on the same frame with its related view, identification and frame references should be indicated on rela
2、ted frames. See Figure C6.10. 3.14 OFFSET SECTIONS 3.14.1 In order to include features not located in a straight line, the cutting plane may be stepped, or offset, to pass through these features, as shown in Figure C6.11, and the section drawn as if they were in one plane. Such a section is called a
3、n offset section. These offsets should not be shown in the sectional view. Original Issue: 19960419 Copyright, Ford Motor Company. Latest Re-issue: 20101231C66 Printed copies are uncontrolled.ENGINEERING CAD & DRAFTING STANDARDS Return to TOC Figure C6.10 Figure C6.11 3.15 ALIGNED SECTIONS 3.15.1 An
4、 aligned section is a special type of offset section. The section is drawn as though the offset features were rotated into one plane. The term aligned is applicable whether features are rotated into the cutting plane or the cutting plane is bent to pass through the features. See Figure C6.12 and Fig
5、ure C6.13. Original Issue: 19960419 Copyright, Ford Motor Company. Latest Re-issue: 20101231C67 Printed copies are uncontrolled.ENGINEERING CAD & DRAFTING STANDARDS Return to TOC Figure C6.12 Figure C6.13 Original Issue: 19960419 Copyright, Ford Motor Company. Latest Re-issue: 20101231C68 Printed co
6、pies are uncontrolled.ENGINEERING CAD & DRAFTING STANDARDS Return to TOC Original Issue: 19960419 Copyright, Ford Motor Company. Latest Re-issue: 20101231C69 Printed copies are uncontrolled.3.16 BACKGROUND DETAIL 3.16.1 Where the true projection of a part would result in confusing foreshortening or
7、in unnecessary expenditure of time by the draftsman, or both, inclined features such as ribs, spokes, arms or similar elements may be omitted if clarity is improved. See Figure C6.14. 3.17 NONSECTIONED PARTS IN CUTTING PLANE 3.17.1 Where the cutting plane lies along the axis of items such as shafts,
8、 bolts, nuts, rods, rivets, keys, pins, screws and spokes, they should not be sectioned except where internal construction must be clarified. See Figure C6.15. 3.18 SECTIONS THROUGH WEBS OR RIBS 3.18.1 Where the cutting plane passes along the center plane of a web, rib or similar parallel element, i
9、n order to avoid a false impression of thickness or solidity, the element may be section lined with double spacing between the lines, as shown in Figure C6.16. The line of intersection between the solid body and the web or similar parallel elements may be shown as a hidden line. ENGINEERING CAD & DR
10、AFTING STANDARDS Return to TOC 3.19 INTERSECTIONS IN SECTION 3.19.1 Where a section is drawn through an intersection in which the exact figure or curve of intersection is small or of no consequence, the figure or curve of intersection may be simplified. See Figure C6.17, (a) and (c). Larger figures
11、of intersections may be projected as shown in (b), or approximated by circular arcs as in (d). 3.20 CONVENTIONAL BREAKS 3.20.1 In order to shorten a view of an elongated object, conventional breaks are recommended, as shown in Figure C6.18. Original Issue: 19960419 Copyright, Ford Motor Company. Lat
12、est Re-issue: 20101231C610 Printed copies are uncontrolled.ENGINEERING CAD & DRAFTING STANDARDS Return to TOC Figure C6.17 Figure C6.18 Original Issue: 19960419 Copyright, Ford Motor Company. Latest Re-issue: 20101231C611 Printed copies are uncontrolled.ENGINEERING CAD & DRAFTING STANDARDS Return to
13、 TOC 3.21 SECTION LINING OR CROSSHATCHING 3.21.1 Should not be used on detail or assembly drawings unless it is absolutely necessary to clarify internal construction. Should be used on manufacturing assembly and manufacturing detail drawings to achieve more clarity on multiple sections. The lines sh
14、ould be thin, 0.3 wide. The spacing should be proportional to the size of the part and preferably not less than 4 and preferably at an angle of 45 degrees to the axis or to the axis of the section. See Figure C6.19. The angle may be changed for multiple sections and in instances where drawing clarit
15、y cannot be achieved by these means, symbolic hatching may be used, see Figure C6.20. In the case of large areas, section lining may be limited to a zone following the edge of the section. Figure C6.19 Original Issue: 19960419 Copyright, Ford Motor Company. Latest Re-issue: 20101231C612 Printed copi
16、es are uncontrolled.ENGINEERING CAD & DRAFTING STANDARDS Return to TOC Figure C6.20 3.22 SCALE OF SECTIONS 3.22.1 A sectional view may be drawn to a different scale if necessary, in which case the scale must be shown under the section title, as shown in Figure C6.21. 3.23 ORDER OF SECTIONS 3.23.1 In
17、 cases where numerous section designations are required, they should be arranged alphabetically in an orderly sequence. See Figure C6.22. Original Issue: 19960419 Copyright, Ford Motor Company. Latest Re-issue: 20101231C613 Printed copies are uncontrolled.ENGINEERING CAD & DRAFTING STANDARDS Return to TOC Figure C6.21 Figure C6.22 4 SPECIFICATIONS (Reserved) 5 ADDENDUM (Reserved) Original Issue: 19960419 Copyright, Ford Motor Company. Latest Re-issue: 20101231C614 Printed copies are uncontrolled.
