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How to Read CAD House Plan Drawings Look at the legend. The legend or key, usually located near the lower right-hand corner of the drawing, should explain all of the symbols on the drawing. Look at the title block. Read the notes. Pay attention to lines.
How do you read technical drawings?
Technical drawings are used to visualize just about anything that is manufactured, built or assembled. From idea to drawing to factory, mill or construction firm, a technical drawing describes shape, dimensions, materials, construction and overall look of the object being created.
How do you read and understand engineering drawings?
The title block contains information such as: Name and address of the company or agency who prepared or owns the drawing. Part number and description. Material. Mass. Finish. General tolerances. Projection details. Scale used in the drawing.
How do you read drawing dimensions?
Follow projection lines to read most dimensions. Lines drawn up or down indicate length and width, while those out to the side indicate height. Some drawings might place the dimensions directly on the side of the object if it’s clear in the drawing what side that dimension refers to.
What is RF in engineering drawing?
A representative fraction (RF) is the ratio of distance on the map to distance on the ground.
How many views are there in engineering drawing?
The most common way to communicate all the information is by using three different views in a multiview drawing: Front view. Top view. Side view.
What are the 3 types of drawing dimensions?
The basic types of dimensioning are linear, radial, angular, ordinate, and arc length.
What do dimension lines end with?
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.
What are the alphabet of lines?
Line symbols used in technical drawing are often referred to as ALPHABET OF LINES. The use of line symbols enables engineers/designers to express the features of designed products clearly and accurately. Line features vary not only by width but also by how they are graphically represented in a drawing.
What are the 6 types of construction drawings?
What Are the Six Types of Construction Drawings? Plans. Interior and exterior elevations. Building and wall sections. Interior and exterior details. Schedules and room finishes. Framing and utility plans.
How do you calculate Rf values in engineering drawings?
Representative factor = ratio of the length in drawing to actual length. R.F. = (length in drawing)/20 mm = 4.
What are the six orthographic views?
surfaces of the object positioned so that they are parallel to the sides of the box, six sides of the box become projection planes, showing the six views – front, top, left, right, bottom and rear.
What is scales in engineering drawing?
Definition. A scale is defined as the ratio of the linear dimensions of the object as represented in a drawing to the actual dimensions of the same.
Is engineering drawing hard?
Engineering drawing may be about technical drawings but it is one of the toughest subjects, ask any engineering student and you will know. A sound knowledge of drawing is vital otherwise its a tough road ahead with the subject. It is an art because it involves a lot of drawing, that to complex form of drawing.
How do you read first and third angle drawings?
The difference between first and third angle projection is in the position of the plan, front and side views. In third angle, what you see from the right would be drawn on the right. In first angle, the view from the right would be projected through and drawn on the left.
How can I be good at engineering drawing?
9 Tips for Better Engineering Drawings that Save Time and Money Tip #1: Dimension only critical & measurable features. Tip #2: Communicate hole tapping needs with thread size and depth. Tip #3: Consolidate call-outs when multiples of the same feature exist in a view. Tip #4: Communicate assembly intent of critical features.
What are the types of views in CAD?
Types of Drawing Views Base View. The first view created in a drawing. Projected View. An orthographic or isometric view that is generated from a base view or other existing view. Auxiliary View. A view projected perpendicular to a user-selected line or edge. Section View. Detail View. Overlay View. Draft View.
What are the 4 orthographic views?
Standard practice calls for three orthographic views, a front, top, and side view, although more or fewer views may be used as needed.
What are the 3 standard views in an orthographic drawing?
Although six different sides can be drawn, usually three views of a drawing give enough information to make a three-dimensional object. These views are known as front view, top view and end view.
What are the 4 types of dimensioning mistakes?
What are the 5 types of dimensioning mistakes? 44. 1) Spacing 5) Missing dim. (n of hole) 3) Text 4) No Gap 2) Don’t dim.
How do you read measurements in CM?
Length, width, and height are measurements that allow us to indicate the volume of geometric bodies. The length (20 cm) and the width (10 cm) correspond to the horizontal dimension. On the other hand, the height (15 cm) refers to the vertical dimension.
What does CAD and CADD stand for?
What are the 7 types of lines?
Points, Lines and Angles. Horizontal Lines. Vertical Lines. Parallel Lines. Perpendicular Lines. Some Other types of Lines in Maths.
What is a phantom line?
Lines that are made visible as dots or dashes to reveal the edges of objects currently hidden from view.
What is a hidden line?
A hidden line, also known as a hidden object line is a medium weight line, made of short dashes about 1/8” long with 1/16”gaps, to show edges, surfaces and corners which cannot be seen. Sometimes they are used to make a drawing easier to understand.
What are basic lines?
There are five basic kinds of lines: Curved, Vertical, Horizontal, Zigzag and Diagonal. Curved lines change direction gradually to form curves, spiral and circles.
What are the 6 types of lines?
Line is a mark made using a drawing tool or brush. There are many types of lines: thick, thin, horizontal, vertical, zigzag, diagonal, curly, curved, spiral, etc.
What are the 12 types of lines?
Terms in this set (12) Object lines. shows the contour or outline of objects. Hidden lines. represents features that are hidden in current view. Centerlines. locates the center of circles and arcs. Extension lines. show the extinct of a dimension. Dimension lines. Leader lines. Cutting-plane lines. Viewing-plane lanes.
