Quick questions on Engineering drawing of mechanical assemblies: HSC Engineering Studies Lifting Devices

A detail drawing shows a single component, fully dimensioned, with material, finish and tolerance information. Each manufactured part has one detail drawing.

When internal features cannot be clearly shown with hidden lines, AS1100 allows section views.

For three-dimensional clarity, an isometric view is drawn with three axes at 120 degrees apart in the plane of the drawing. AS1100 specifies the isometric grid and allows isometric drawings as supplementary pictorial views, never as the sole orthogonal projection. Lifting-device assemblies are often shown in isometric on the cover sheet to give the reader spatial context.

Each part on the assembly drawing is labelled with a balloon (a numbered circle on a thin leader line) pointing to the part. The parts list (bill of materials) is at the bottom right of the sheet, above the title block:

A tower crane drawing package typically includes assemblies for the mast section, the slewing platform, the operator cab, the counter jib with ballast, the working jib with hoist trolley, and the hook block. Each assembly references detail drawings of every fabricated part. Field installation drawings show the mast climb sequence and torque values for the assembly bolts.

The cutting plane passes completely through the part. Used for the majority of single-part section views.

The cut goes through only half the part, along a plane of symmetry. The other half remains an exterior view. Saves space on symmetrical parts.

The cutting plane bends to pass through several features that are not on a single straight line. The bends are not shown on the section view.

A cross-section taken perpendicular to a long member (a shaft, an arm) is rotated into the plane of the view and drawn in place.

AS1100 requires different hatching directions or spacings for adjacent parts in a section, so they are clearly distinguishable.

A section view without a labelled cutting plane on the parent view is ambiguous. Always show the chain-line cutting plane with arrows on the view from which the section was taken.

Isometric is a pictorial view, not orthogonal. It is not first-angle or third-angle; it stands separately on the drawing sheet. :::