Drawing section views middlesex county vocational and. Cutting planes are indicated on the drawing by a long chain line 0. Cutting plane lines show where an imaginary cut has been made through an object in order to view and understand the interior features. Section 11 general principles of dimensioning on technical drawings. May 14, 2020 cutting planes are indicated on the drawing by a long chain line 0. B phantom lines c extension lines d cutting plane lines ans. A section view is obtained by cutting away part of an object to show the shape and construction at the cutting plane. Cutting plane indicating location of sectional cut arrows also support this by indicating viewing direction where the cutting plane is also a centre line, it takes on some of the centre lines qualities thick ends, thin elsewhere a a a cutting planes. Cutting plane lines are used to show where an imaginary cut has been made through the object in order to view interior features. Jun 15, 2015 watch this video to learn about section views.
Key to successful drafting is to have a good technical knowledge of these various line characteristics to understand where and when to apply them in technical drawing. Technical drawing is a form of design communication based. The exercise will begin with an ambiguous set of 4 traces, from which students will construct a. Notice the cutting plane line aa in figure 338, view a. Engineering drawing app technical,civil,mechanical for. You can apply the same guidelines to a planometric or perspective box. In the figure the cutting plane line is drawn in the top view, which is adjacent to the sectioned front view. Since technical drawings are made of lines, it is logical that the first step in learning to read a drawing is to learn the meaning of each kind of line. The diagonal lines on the section drawing are used to indicate the area that has been theoretically cut. Note the arrows on the section view the dashed line shows the person viewing the drawing where the object was cut, and then the arrows show which half youre going to look at. Jan 20, 2014 sections and cutting plane lines hidden lines in sectional views lines behind the cutting plane section lining practices, techniques and symbols draw sectional view given an isometric view. Engineering drawing iii for technical high school students. Which type of line is particular to section drawings.
Technical drawing specifications resource 8 arcs are sketched between the tangent points green dots cutting off the corners of the box. Cross hatching in the section view shows the solid surface of the object which were cut through to produce the section. The exposed plane is called the sectional view and the line used to cut the object is referred to as the cutting plane line. B a5 a5 b a5 b b b b generally a section callout consists of two circles, one on each end of the cutting plane line. Mcq on engineering drawinggraphics royal mechanical. The ellipse is completed by sketching arcs as wide as possible within the box, carefully making a smooth curve where the four arcs meet. Cutting plane lines in drawings autodesk community.
It is a language of communication between architects and engineers, usually to convey information about the object. Cutting plane lines in drawings in the drawings that i have made where i have created cutting planes for section views, the line type for the cutting plane is shown as a solid line. Conventionally it is labeled as section aa or bb technical drawing introduction drawing a section they are a way to, imaginary, cut through an object and create an. I am a student in a drafting 1 class and we are going over all of the section views full, half, revolved, offset, etc. The offsets or bends in the cutting plane are all 90 degrees. Line types are also a language type to communicate between technical people. A bow compass b scale c dividers d extra leads ans. Sketched lines visible line hidden line hatching centerline dimension extension leader cutting plane viewing plane short break long break phantom stitch chain line patterns communicate what the line represents in the drawing line patterns tell you information such. Engineering drawing app technical,civil,mechanical apps on. Drawing is a form of visual art in which a person uses various drawing instruments or software to produce 2d or 3d objects. Make sure you understand the use of the cutting plane line to show the section.
Most drafters specialize in a specific area of technical drawing. An engineering drawing is a drawing or a set of drawings that communicates an. Sections are used to show interior details clearly. Cutting plane lines and the interior features of the object they bisect are never in the same color as the rest of the plan. Cutting plane lines which show where the cutting plane passes through the object, represent the edge view of the cutting plane and are drawn in the views adjacent to the section view. Make sure you understand the use of the viewing plane line to show an additional view. Show cutting plane lines when selected, displays line segments to indicate the entire cutting plane. A drawing that displays technical information to the reader through specific visuals, directions, notes, etc a good technical drawing should be informative, clear, neat, unambiguous and not cluttered. The line type is phantom and the line weight is very thick 0.
Piercing point cutting plane method given a line, l, and a plane in two adjacent views, 1 and 2, where the plane is defined by. Define the type and size of cutting plane lines and arrows on the lines tab in the drawing view style dialog box. Creating one of the standard two types of cutting plane lines would make the drawing confusing to the reader. Limits of partial and interrupted views and sections.
Architectural symbols and conventions section marks the arrow can be left open or colored in. Sections and cutting plane lines hidden lines in sectional views lines behind the cutting plane section lining practices, techniques and symbols draw sectional view given an isometric view. The path of the cutting plane is shown by the cutting plane line in the top view of fig. The cutting plane is lettered and the arrows indicate the direction of viewing. Which angle cannot be made with either a 45 or 3060 triangle or a combination of the two. When a centerline and cutting plane line coincide, the one that is more. Fundamentals of technical drawing technical drawing. Technical drawings lines,geometric dimensioning and. Drawing is the art or technique of representing an object or outlining a figure, plan or sketch by means of lines. Abc, find the piercing point by the cutting plane method.
Objectives at the end of this section you should be able to. Cutting planes are represented on drawings by long thin chain lines. The diagonal lines on the section drawing are used to indicate. The cutting plane is shown on one of the orthogonal views, indicating viewing direction while the effected view uses hatching to show the the section effected by the cut. A drawing instrument set usually contains all of the following, except. However, it is very important that the drawing produced to be accurate and clear. The cutting plane line bisects the object and provides a view of its interior features. Object or visible lines thick dark line use to show outline of object, visible edges and surfaces. Cutting plane, to draw the trace at section planes, g. Figure c also illustrates how hidden lines in a section eliminate the need for an additional view. Line color sets the color of cutting plane line segments. The corners where the section plane charges the direction are made thick for a short length. The engineering technical drawings all in one app for engineers engineering drawing app for civil,mechanical,electrical engineers professionals.
After a cutting plane is created, you can control the display of cutting plane lines by selecting the cutting plane annotation and then using the options on the cutting plane selection command bar and in the cutting plane properties dialog box after a section view is placed, you can control the display of the cutting plane graphics using the following check box on the general tab drawing. It shows and describes clearly and accurately the information required to build or manufacture a product. A cutting plane line shows where object was cut to obtain the section view. A section view is a view used on a drawing to show an area or hidden part of an object by cutting away or removing some of that object. Feb 09, 2019 engineering drawing iii for technical high school students of kerala state 1. The result is called a front section, or front view in section, since it replaces the front view in the drawing. A cuttingplane line shows where object was cut to obtain the section view. These lines are called section lining orcrosshatching. Section a a using these lines visible lines are used to show a change in direction on each. Perpendicular lines or projectorsare drawn from all points.
Sections and sectional views engineering drawing joshua. Engineers use cutting plane lines on the plans they are drawing up to differentiate what is inside an object and what lies outside it. Sectional views are used in technical drawing to expose internal surfaces. Slide set 1 alphabet of lines and precedence of lines. The default content and appearance of cutting plane lines, terminators, and captions is defined in the drawing view style that is applied to the view. The lines in this layer should be a little wider than the object lines and the linetype should be phantom. Select the waterlines layer and place straight lines in. A drawing instrument set usually contains all of the following.
Section lines sometimes the technical information conveyed by a drawing can best be shown by a view that represents the object as it would look if part of it were cut away. Engineering drawing iii for technical high school students of. All the students and professional of civi,mechanical,electrical can use this app to learn the drawings of engineering. Lines to indicate surfaces which require additional. It would be almost impossible for an engineer, designer, or architect to describe in words the shape, size, and relationship of a complex object. The person who will read drawings have to learn what they mean. Technical drawings provide clear and accurate information how an object is to be manufactured. Arrows are located at the ends of the cutting plane line and the direction indicates the line of sight into the object.
I put together a crude drawing for you to follow along with below. The following chart shows technical drawing lines that describe a piece of machinery with a swinging arm. Engineering drawing iii for technical high school students of kerala state 1. The single view in figure 338, view b, helps you to visualize the cutting plane. The last method of drawing cutting plane lines is used when there is a great deal of drawing detail within the object. Cutting plane tab section view style manager autocad. Sketched lines visible line hidden line hatching centerline dimension extension leader cutting plane viewing plane short break long break phantom stitch chain line patterns communicate what the line represents in the drawing line patterns tell you information such as whether the line is hidden, visible, or a centerline. Cutting plane lines are used to define the location for the sectional. The fundamentals of design drafting a students guide.
A drawing can be done using freehand, instruments or computer methods. The path of the cutting plane is shown by the cuttingplane line in the top view of fig. Pdf created with fineprint pdffactory pro trial version. An engineering drawing, a type of technical drawing, is used to fully and clearly. Cutting plane lines are long lines, thickened ar ends and thin elsewhere, with alternately long and short dashes of proportion ranging from 4. Technical drawing lines are used for different purposes to provide specific information for designers, manufacturers, etc. The sectional view or plan must then be stated to be aa, or other letters appropriate to the cutting plane. Drawing the cutting plane lines switch to the cut layer to draw the cutting plane. The short line segments extending from the circle represent the cutting plane line. Technical drawing is concerned mainly with using lines, circles, arcs etc.
Two types of lines are acceptable for cutting plane lines in multiview drawings. Intro to technical drawing sada, spring 2010 drawing a section a a where the object is cut is called the cutting plane and the direction of view is depicted by arrows. Half sections are used mainly for symmetric objects or assembly drawings. The fundamentals of design drafting resources are flexible and instructors should feel comfortable supplementing curriculum resources that they have found successful throughout the years. The cut line is called a cutting plane, and can be done in several ways. Viewing or cutting plane lines are the thickest of all lines. If you are looking to learn technical drawings, then this app can help you. Technical drawing specifications timboon p12 school.
The arrows at the ends of cuttingplane line point in the direction of sight for front section. We welcome your suggestions, and hope that you will become part of the collaborative effort in educating our future engineers and architects. The full section view is the traditional type of section view used on most engineering drawings. All projection lines are orthogonal to the projection plane.
Line types identification purpose in this section you will be able to recognise and interpret different line types, and the need for variation in thickness used on engineering drawings. It is important to use only one type of cutting plane line on a single drawing. If all lines on a drawing were equally thick, the drawing is confusing and difficult to interpret, as the outlines do not stand out from the dimension lines, with small objects made obscure from the intersection of many thick lines. Hidden lines behind the plane of projection are customarily omitted, while lines visible behind the plane of projection must be included in the sectional view. It is used when free hand lines are drawn by tools. If you click select color at the bottom of the color list, the select color dialog box is displayed. You have heard the saying, a picture is worth a thousand words. An example of this use of phantom lines is shown in the righthand view of figure 336. The following slides will help show the several methods or types of section views. Anderson 17 drawing views detail views when there is a great disparity between feature size, or views are overcrowded with dimensions, a detail view can be used to capture the features of interest and display them in a removed view of greater scale. This statement is particularly true in regards to technical drawings. The computer keeps a record of all dimensions in the drawing changes to drawing can be made easily editing processes include the ability to copy, move, rotate, mirror and erase drawing parts drawing storage is on a hard drive, memory stick, cd, dvd or floppy disk rather than in. In this last method, snap a leader with a 90 o angle to the midpoints of your object as done previously.
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