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Sectioned Assembly

Sectioned Assembly. Lecture 18. Topics For Today. Tuesday – Using CAD to do a sectioned assembly Wednesday – Lab #6 Read the write-up and the referenced pages from The Way Things Work Gears, Sprockets and Chains Quiz on Dimensioning next week. Steps for completing the assignment.

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Sectioned Assembly

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  1. Sectioned Assembly Lecture 18 Autumn Quarter

  2. Topics For Today • Tuesday – Using CAD to do a sectioned assembly • Wednesday – Lab #6 • Read the write-up and the referenced pages from The Way Things Work • Gears, Sprockets and Chains • Quiz on Dimensioning next week. Autumn Quarter

  3. Steps for completing the assignment • Download the file with the outline of the sectioned assembly • The CADKEY file is on class on peter (H: drive) • The AutoCAD file is available under Discussion on WebCT • With the person next to you, develop a sketch for your sectioned assembly. Sketch on the problem sheet. Compare with the pair across your table. • Get your assembly approved by the teaching staff. • Start on your CAD drawing of the Assembly Autumn Quarter

  4. Some guidelines • Measure the parts on the top of the page with your ½ size scale. • Look for lines and curves that can be offset to form the correct shapes • Use the proper colors (CADKEY) for the various lines • Set up the proper layers (AutoCAD) with line style, line thickness, and color. Autumn Quarter

  5. Runouts • Be conscious of the runouts – the points where a straight line meets a curved surface Autumn Quarter

  6. Sectioned Assembly (cont.) • On the outline of the sectioned assembly, change the lines to the proper line type. • Use the proper line types for the drawing. • Add the title block before printing. Fill out the title block with the appropriate information. Autumn Quarter

  7. Sectioned Assembly (cont.) • Start with the curved lines on Part #5. Offset or copy these to the inside of the part • Extend the ends of these lines to the curved cylinder on the right end. • Put in the polyline that forms the edge of the broken-out section of the right end. • Construct the broken-out section with Part #3, bushing, in place. Cross hatch the two parts revealed by the broken-out section. Use the cross hatching symbols shown in the part details. Autumn Quarter

  8. Cross Hatching with CADKEY • The menus to use are as follows: • CADKEY – Applications – Detail – Sections (fourth row down – middle icon) • This brings up a dialog box. Click on quick hatch. • Use alternate directions of cross-hatching for adjoining parts. This can be set in the dialog box. • CADKEY is finicky about having the corners closed on the shape being crosshatched. You may have to use trim-extend to close corners or you may have to break lines at corners. Autumn Quarter

  9. Crosshatching with AutoCAD • Click on the X-Hatch icon on the draw menu (left side) • The dialog box has Quick and Advanced tabs. Click on the Quick tab. • You can set the X-Hatch style and the angle (normal is 0 = 45 degrees, 90 =135 degrees) • Click on Pick Points, the dialog box disappears, then click inside the area to be X-Hatched, the outline will change to dotted, right click, click on Enter, the dialog box re-appears, click on OK. Autumn Quarter

  10. Sectioned Assembly (cont.) • Move to the left end of the assembly • Locate the lines that outline Part #2, bushing. These can be located by copying the vertical line on the left side of Part #5 and by extending the horizontal lines • Cross hatch the portion of Parts #3 and #5 that are revealed. • Add two horizontal lines to complete the top of Part #4, the axle or shaft. Autumn Quarter

  11. Sectioned Assembly (cont.) • One of the ways to complete the assembly is to do a full section of the base. • Another is to do a broken-out section. • For both, the inside cavity has its left side parallel to the outer side of the base. • Don’t forget to put in the hole for the fastener on the left side (or both sides with the full section) of the base. Autumn Quarter

  12. Sectioned Assembly • This is worth two drawings: • Dwg 35 & 36. Autumn Quarter

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