How to Do the Unfolding Drawing of Hvac Round Elbow Duct

1. Unfolding Drawing of Round Right Angle Elbow Duct

(1) Draw the front view and top view of the round right-angle elbow, the top view can be drawn into a semicircle, as shown in Figure 3-23.

(4) Expand the circumference of the main view and divide it into 12 equal parts, and pass each equal part the point is a vertical line, which intersects the parallel line drawn from each point of the oblique opening of the main view, and uses a smooth curve connect the intersections to complete the expanded diagram.

All the unfolding pieces can be cut manually or by duct plasma cutting machine, with assistance of duct design software we can get each work pieces easily and they can be cut automatically by duct plasma cutting machine in short time. With help of plasma cutting machine, the manager will save labor cost and work time on those special design duct work and increase the working efficiency.

After cutting off those work pieces, the duct elbow making machine( gorelocker) will help to form the each pieces to the final product such as the round elbow duct with 45°or 90°, one way to two ways or others.