And it has a tool that allows you to check the scale, or to set the scale to the dimensions on the plans. The other 10 percent of the time, we adjust the scale according to verified portions.
And if the scale is off, the software will adjust the scale of the overlay image to match the detail. And we periodically spot-check the drawings as we go along to make sure that everything is to scale. If they are not, we have the ability on the digitizers to make adjustments for that. Mistakes can be very costly. That said, I also think that drawing systems have progressed and things tend to be more accurate these days. If he notices incorrect measurements, he has to be able to work out what they should be.
We know that the estimator has to make corrections in those instances. But we also know that this is the way things are sometimes, and that there are things that the estimator will have to extrapolate. Price says, "We often see the caution that we should look at drawings for all the trades, say plumbing, electrical, mechanical and structural—in other words, the whole set. They are concerned that we may only print the structural and not the other parts of the plan and so miss something that showed up on another set of plans for another trade.
We see that disclaimer a lot. Can we afford to bid what we believe they mean, and still be competitive? Digital Distortion Digital files are not impervious to distortion and error. The following interesting disclaimer was found online: "Computer Aided Design CAD data are being provided to the recipient of this disclaimer. We make no representation as to its completeness, currency or accuracy because of reasons inherent to CAD.
All digital CAD data appear to be extremely accurate, however, this apparent accuracy is an artifact of the techniques used to generate it, and is in no way intended to imply actual accuracy.
The user of this data takes full responsibility for the accuracy and correctness of all measurements, area, inventories or other data extracted from this, either manually or with the use of a computer.
However, we came across instances both with estimators and architects where things were lost or distorted as a result of digital processing. Therefore, your next step is to learn the basics of dimensioning. In that way you will understand not only how to interpret a drawing to get the information you need, but also how to dimension your sketches so that they can be used to communicate size information to others. It may seem a bit basic, but a few exercises with the shapes of numbers comes before dimensioning.
The reason for such review is simply that incorrectly or carelessly made numbers on a drawing or sketch can easily be misinterpreted by someone on the job. That can be costly. The number forms presented here have been determined to be the most legible, and are used by industry nationwide. The dimension line is a fine, dark, solid line with arrowheads on each end. It indicates direction and extent of a dimension. In machine sketches and drawings, in which fractions and decimals are used for dimensions, the dimension line is usually broken near the middle to provide open space for the dimension numerals.
In architectural and structural sketches and drawings, the numerals are usually above an unbroken dimension line. You do not necessarily have to remember this, but you should remember not to crowd your dimension lines and to keep them a uniform distance apart.
Note: Dimensions less than six feet 72 in. Dimensions over six feet are usually shown in feet and inches. Be sure that it is clear how dimensions are called out. Extension lines on a drawing are fine, dark, solid lines that extend outward from a point on a drawing to which a dimension refers. Usually, the dimension line meets the extension line at right angles.
Also, there should be not gaps where extension lines cross. Notice in this example the larger dimensions are correctly placed outside, or beyond the shorter dimensions, and that the dimensions are preferably not drawn on the object itself.
Sometimes, however, it is necessary to dimension on the object. It is important to remember to place dimensions on the views, in a two or three view drawing, where they will be the most easily understood. Avoid dimensioning to a hidden line and avoid the duplication of dimensions. Use common sense; keep dimensions as clear and simple as possible.
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