Proceed as for the Square to Round example above to find True Lengths of lines joining the two shapes together (i.e.Carefully number all lines joining the two shapes together and note any equalities to avoid unnecessary work later.if the axis one pipe is set at an angle to the other), construct an Auxiliary View to establish True Lengths around the perimeters of both shapes to be joined. because they are sloping away from you or towards you). Note which lines are perpendicular to the viewer (and therefore True Views with True Lengths) and which are not (i.e.corners of polygons or equidistant points plotted around the circumference of a circle) Identify convenient points around the perimeter of each shape to be joined (e.g.Draw Plan and Elevation of the required Transition Piece.Rectangular to Round, Octagon or Hexagon) for those where the two main axes are offset and for situations where one pipe is set at an angle to the other.
General Method of Construction for Transition PiecesĪ similar procedure can be used to determine the Developments for other Transition Pieces (e.g.
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Similarly strike arcs equal to True Length D-10 and circle division 9-10 to find point 10.Set Compasses to the True Lengths of A-9 and D-9 and strike arcs from each end of A-D to create the Isosceles Triangle A-D-9,.Work around the Plan View and use True Lengths to construct triangles as follows:.Using the Transition Piece elevation as height and the joining line lengths in Plan as base, draw the hypotenuse to find True Lengths,.Use Dividers to transfer the lengths of the joining lines on to a horizontal line as shown ( Note : in this case there are only two lines different in length),.Join the corners of the square to the relevant points around the circle ( Note : none of these are True Views because they are angled either away from or towards you),.Divide the circle into, say, 12 equal points ( Note : in this case, the distances in Plan View around the circle between these points and the lengths of the sides of the square are all True Views because neither the circle nor the square are tilted in any way - i.e they both lie in the horizontal plane).Draw Plan and Elevation of the required Transition Piece,.Consider the example of a Square to Round Transition Piece with both Axes directly in line with each other.
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