Isometric Projection of Irregular Curve

ISOMETRIC PROJECTION OF IRREGULAR CURVE

Off-set method is generally followed to draw the isometric projection of an irregular curve. Consider an irregular curve shown in Fig. 17.14 (i) to be drawn in isometric view in vertical and horizontal positions.

Marking the Reference Points

1. Locate some reference points on the given curve ab at c, d, e and f.

2. Through the reference points a, b, c, etc. draw vertical and horizontal lines so that the given curve ab is fit into a rectangle.

3. Mark the successive offsets as x1, x2 .... etc. horizontally and y1, y2 …. etc. vertically as shown in fig. 17.14 (ii). (Offsets need not be of equal length)

4. Mark the corners of rectangle as a, 1, 2, and 3.)

Isometric Projections

1. Draw the right isometric plane on the isometric axes A-1 and A-3 and construct the Rhomus A123. 

2. Mark the offsets x1, x2 etc. and y1, y2 …. etc. on isometric axes A-1 and A-3 respectively.

3. Locate the points of intersection as reference points C, D, E and F.

4. Join the points with a smooth curve which is the required isometric view (shown in Fig. 17.14 iii). 

Similarly the given irregular curve can be drawn in left isometric and top isometric as shown in eenil ondemoel erf Fig. 17.14 (iv) and Fig. 17.14 (v) respectively.