Tow-Bar Mounted Bike Rack

Create a detailed 2D engineering drawing of a vehicle tow-bar mounted bike rack in millimetres. Include front elevation, side elevation, top/plan elevation, isometric view, tow-bar bracket detail, materials list, and fabrication notes. Main frame: use 25 × 25 × 2 mm square steel tubing. Overall rack width = 700 mm and overall frame height = 780 mm. In the front elevation, arrange three vertical bicycle supports across the 700 mm width, with approximately 280 mm spacing between support positions. Lower internal/base width shown = 530 mm. Create three bicycle wheel retaining loops/supports using 25 mm wide × 6 mm thick steel strip. The wheel-support height is approximately 520 mm from the lower rack area as indicated in the drawing. Provide a horizontal upper frame made from 25 × 25 × 2 mm square tube, with approximately 280 mm side projection/depth in the side view. Side elevation: overall height = 780 mm. Show a lower horizontal mounting arm extending approximately 400 mm from the vertical frame. Include the 140 mm lower mounting-height dimension and the 520 mm vertical dimension shown on the reference. Plan/top elevation: overall width = 700 mm, with support spacing dimensions of 280 mm and 280 mm. Overall rack depth shown = approximately 290 mm. Show three steel-strip wheel supports and the rectangular square-tube frame. Base/mounting plates: use 8 mm thick steel plate. Show the rack fixed to a tow-bar mounting bracket. Tow-bar bracket detail: rectangular steel plate approximately 130 mm wide × 55 mm high with two Ø16 mm mounting holes. Show the hole centreline/detail dimension of approximately 45 mm as indicated. Position the tow-bar mounting arrangement approximately 330 mm above ground level. Add an isometric view showing the complete welded rack: rectangular lower frame, three upright bicycle support positions, upper rails, three curved wheel-retaining strips, horizontal tow-bar arm, and vertical tow-bar mounting plate. Add fabrication notes: All welds to be 4 mm fillet weld unless otherwise noted. Remove all sharp edges. All dimensions are in millimetres. Rack bolts to the tow bar after removing the tow ball. Add materials: – 25 × 25 × 2 mm square-section steel tubing – 8 mm thick steel plate – 25 mm wide × 6 mm thick steel strip. For AutoCAD, I would set it up with UNITS = millimetres, then use mainly LINE, PLINE, OFFSET, RECTANG, ARC, CIRCLE, TRIM, EXTEND, FILLET, COPY, MIRROR, DIMLINEAR, DIMDIAMETER, and MTEXT.

Parameters

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