Thursday, 19 April 2012

Step 05 - Transferring Dimensions

Transferring dimensions collected must be a simultaneous process and completed on  site. Though it is better to draft manually, in this case it was directly drafted in AutoCAD2010. The first step was to make a proportionate sketch of the space to be measured, on a graph paper (millimeters). The sketch reflects only those points which help develop the profile of the space i.e. openings, prominent mouldings and corners. These points are then marked alpha-numerically and in order. Dimensions to be taken for drafting specific points are then identified. For critical points, especially those over 3.0 m in length, a second set of dimension are also taken as cross-checks.

Different methods were exercised to find an appropriate one to note dimensions. Initially, diagonals were drawn connecting two points between which dimensions are to be taken. The latter was noted in the form of 2.88.6 - i.e. 2 meters, 88 centimeters and 6 millimeters.  This system of noting, recommended by the HABS and HAERS systems proved to be cumbersome and confusing and hence restricted to room S1 alone. Thereon, dimensions were recorded as - 2886 mm and called out as 'Two Eight Eight Six' and noted on the graph paper as - 1- A : 2886m.

Recording dimensions at Site

The same dimensions as noted were transferred to AutoCad on site or at Office on return. Dimensions that proved erroneous were marked and verified either immediately or on the following day. 

On Autocad, the intersection of the arcs of dimensions are retained as a distinct layer - 'MD-Draft_Arc' and dimension lines as 'MD-Draft_Measurement Lines'. It has been decided that any point that provide the built profile would not be drafted in Autocad but be done manually, noting the undulations of the surface later. 

Transferring dimensions to AutoCad

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