QUESTION $1$

$(100$ MARKS$)$

The Front View and BASE$/$PLAN of a pentagonal prism in Fig Q$2\mathrm{.}1$ are to be drawn FULL SCALE, together with its lateral surface development, centralized in the drawing area. A section plane at $\backslash (30^\{\backslash$circ$\}\backslash )$ cuts off the top part of the pentagon as indicated by the bottom slanting line.

a$).$ Using the illustrated inscribing circle of diameter $\backslash (\backslash$mathbf$\{52$ ~ m m$\}\backslash ),$ height of $\backslash (\backslash$mathbf$\{80$ ~ m m$\}\backslash )$ of the prism, and assuming a lateral surface development of a total width of $\backslash (\backslash$mathbf$\{153\}\backslash$mathbf$\{$~ m m$\}\backslash ),$ calculate the vertical and horizontal spacings between the views $($i$.$e$.,$ front, top, and lateral surface development$),$ and the margins of the drawing area.

b$).$ draw the views paying attention to the following:

i$.$ that the drawing paper margins, and title block have been drawn to specifications, and the given views are positioned in the drawing area as calculated in $($a$)$ above, and correct line types are used. $[4$ Marks$]$

ii$.$ that the base view is constructed according to the general principle used for constructing a pentagon given the diameter of the inscribing circle

$[8$ Marks$]$

iii. that you have used correct line types of consistent weight across the drawing for the various views

$[4$ Marks$]$

iv$.$ that only your student number is given, aligned to the left of the title block, in correct lettering.

$[2$ Marks$]$

v$.$ The cutting plane line is redrawn to the technical details of the ANSI standard given in Appendix C and clearly indicating the viewing direction from the top left$-$hand side $[10$ Marks$]$

c$)$ Construct the TRUE SHAPE $($TS$)$ of the cut surface using the reference line method paying attention to the following:

i$.$ that the reference line

$-$ is coincident with the left top corner of the front view as illustrated in Fig Q$2\mathrm{.}1$

$-$ is in chain line $[4$ Marks$],$

$-$ is constructed neatly $[4$ Marks$],$

$-$ is constructed parallel to the section plane line $[2$ Marks$]$

$-$ is labelled using correct notation

ii$.$ that the TRUE SHAPE $($TS$)$

$[2$ Marks$]$

$[2$ Marks$]$

$-$ is correctly sized and orientated

$[2$ Marks$]$

$-$ is constructed by applying the reference line method correctly $($noting that it would be advisable to have the other reference line on the pentagon view on its bottom horizontal edge$)$

$[4$ Marks$]$

$-$ is drawn in the correct line.

iii. that the cut surface is indicated

$-$ using section lines in the correct line type

$-$ spaced at $4$ mm

$-$ and inclined at $45$ degrees to the TRUE SHAPE fold line

d$)$ Finally, construct the lateral surface development of the prism paying attention to the following

i$.$ the development is correctly located as above.

ii$.$ the development is in correct size, correct drawing technique is used, and the outline has been correctly completed using the correct line type

APPENDIX B

$($Acceptable line types$/$styles for various features$)\backslash$& $($Acceptable lettering style for the title block$)$