Figure 5.75 shows a gasket that is symmetrical around its vertical and horizontal axes. This symmetry will allow you to use the MIRROR command to create much of the drawing
F igu re 5 . 7 5 : A gasket
The diagram in Figure 5.76 summarizes the steps.
F igu re 5 . 7 6 : The 13 steps to creating the gasket
To draw the gasket, set Linear Units to Engineering with a precision of 0′-0.00″.
Set Angular Units to Decimal with a precision of 0.00. Now, follow these steps:
1. Use the LINE command to draw a rectangle 4″ wide and 3″ high.
2. Offset the upper horizontal line and the left vertical line 1″ to the
inside of the rectangle.
3. Use FILLET with a radius set to 1″ on the upper-left corner of the
original rectangle.
4. Draw the circle with the 0.25″ radius, using the intersection of the
two offset lines as the center.
5. Erase the offset lines.
6. Offset the right vertical line 2″ to the left and the bottom horizontal
line 1.5″ up.
7. Use FILLET with a radius of 0.50″ on the intersection of these two
lines, retaining the right and lower segments.
8. Trim back the lower-right corner of the original rectangle
9. Draw circles with 0.50″ and 0.75″ radii on the bottom and right sides
of the shape.
10. Use TRIM to remove unneeded lines.
11. Use MIRROR to flip the shape down.
12. Use MIRROR again to flip the shape to the right.
13. Erase unneeded lines. (Each line to be erased is really two lines.)
14. If you are using AutoCAD, and not LT, add the Equal constraint so
that all four circles remain the same size.
15. Save this drawing, naming it 05-Gasket.dwg.
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