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Emailing ZZ1002D Planes Saleel

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  Planes Inclined to Both HP and VP ã The plane is usually described as follows: ã Inclination of its SURFACE  with one of the reference planes will be given . ã Inclination of one EDGE / DIAGONAL  with the other reference plane will be given ã e.g. A rectangle with sides 30 mm x 50 mm is resting on HP on one small side which is inclined to VP at 30 o , while the surface of the plane has a 45 o  inclination with HP. Draw its projections. ã Hint: You already know how to solve it if the small side on the HP is | to VP ! ZZ1002D - Engineering Graphics  HP VP VP VP a’   d’   c’    b’  HP a  b c d a 1 ’   d 1 ’   c 1 ’    b 1 ’   HP a 1  b 1 c 1 d 1 SURFACE PARALLEL  TO HP PICTORIAL PRESENTATION SURFACE INCLINED  TO HP PICTORIAL PRESENTATION ONE SMALL SIDE INCLINED TO VP PICTORIAL PRESENTATION ORTHOGRAPHIC TV-True Shape FV- Line // to xy ORTHOGRAPHIC FV- Inclined to XY TV- Reduced Shape ORTHOGRAPHIC FV- Apparent Shape TV-Previous Shape   A B C ZZ1002D - Engineering Graphics q 1 q 1 q 1 q 2 q 2  STEPS OF SOLUTION STEP 1. Draw FV & TV of initial position (parallel to one reference plane) Assumptions: 1. If in problem surface is inclined to HP  –  assume it // HP or if surface is inclined to VP  –  assume it // to VP 2. If surface is assumed // to HP- its TV will show True Shape and if surface is assumed // to VP  –  its FV will show True Shape 3. Hence begin with drawing TV or FV as True Shape 4. While drawing this True Shape  –   if the plane rests with one side/edge/diagonal in the reference plane, make this reference side perpendicular to xy (see drawing A on previous slide) If the plane rests with a point/vertex on the reference plane, make this the leftmost point of the surface STEP 2. With the reference side/vertex fixed as pivot, rotate the surface to make it inclined to the respective reference plane (see drawing B on previous slide) STEP 3. Rotate the previous view to make the reference side inclined and draw the final FV & TV ZZ1002D - Engineering Graphics  Example 1 ã A rectangle with sides 30 mm x 50 mm is resting on HP on one small side which is inclined to VP at 30 o , while the surface of the plane has a 45 o  inclination with HP. Draw its projections. ZZ1002D - Engineering Graphics x y a  b c d  b 1 ’(a 1 ’)   c ’(d’)     a 1  b 1 c 1 d 1  b ’(a’)   c 1 ’(d 1 ’ ) c 2 ’   d 2 ’    b 2   ’   a 2 ’   45 0 30 0 Surface // to HP Surface inclined to HP Side inclined to VP
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