Question $3$: Fig $1$ shows two views of a machine cover. Draw, according to scale $1$: $1$ and in thirdangle orthographic projection, the following views of the machined cover: $($a$)$ A sectional front view on cutting plane X$-$X $($b$)$ A sectional right view on cutting plane Y$-$Y Insert only the following symbols and dimensions on the drawing: At B: A surface texture with a roughness value of $25$ micrometre must be produced by machining. At A: A $20$mm diameter hole with an upper deviation of $15$ micrometre and a lower deviation of $0$ micrometre. Add $20$ dimensions. No hidden detail is required. $/$r$/$n