A hidden line also known as a hidden object line is a medium weight line made of short dashes about. An extension line extends a line on the object to the dimension line.
Engineering Design And Cad A B Line Types Flashcards Practice Test Quizlet
Section lines are commonly referred to as cross- hatching.
. The imaginary lines drawn from the object to the plane are called projectors or projection lines. Line weight is the thickness of the line. When an object is made of a combination of materials a variety of section lining symbols makes materials identification easier.
Divide a line of length 40mm into 7 equal parts. The set of these points is called a line. OBJECT OR VISIBLE LINES Thick dark line use to show outline of object visible edges and surfaces.
Section lines are very light. A technical drawing also known as an engineering drawing is a detailed precise diagram or plan that conveys information about how an object functions or is constructed. These lines define the shape of the object portrayed and are the outermost outline of the object.
In the top left section draw an object that focusses on sloping and parallel lines. Construction lines and guide lines are very light easily erased lines used to block in the main layout. Detail Views A detail view is a separate large-scale drawing view of a small section of another view.
This gives rise to number of important line types. Object Line Mario ZavalaDemand Media Object lines are solid heavy lines 7 mm to 9 mm. A round bar is shown as a circle in one view and a rectangle in the other.
Visible outline or object line. When sketching an object or part that requires a sectional view they are drawn by eye at an angle of approximately 45 degrees and are spaced about 18 apart. A visible line or object line is a thick continuous line used to outline the visible edges or contours of.
Just as the points can be arranged in a number of fashions. Therefore any surface that is not in line with the three major axis needs its own projection plane to show the features correctly. These thick solid lines show the visible edges corners and surfaces of a part.
Engineers electricians and contractors all use these drawings as guides when constructing or repairing objects and buildings. These drawings are formed by projecting the edges of the object perpendicular to the desired planes of projection. In this highly interactive object learners associate basic line types and terms with engineering drawing geometry.
Figure 2Parallel lines and sloping lines 5. It is a thin continuous line and is used for the purpose of sectioning an object. In such projection the projectors are not perpendicular to the plane of projection rather inclined to the plane of projection at 30 45.
The section pattern is determined by the material being cut or sectioned. Leave enough room underneath the object for the following label. The plan on which the projection of the object is taken is called the projection plan.
Practise using the right angle isosceles triangle and T-square. Swing the pencil back and forth between the points barely touching the paper until the direction is clearly established. One can not read a drawing by looking at one view.
A line on a drawing always indicates either an intersection of two surfaces as in the projection of a prism or a contour as in the projection of a cylinder fig. Hold the pencil naturally. Usually terminates with arrowheads or tick markings.
The dimension line is a thin line broken in the middle to allow the placement of the dimension value with arrowheads at each end figure 23. Spot the beginning and end points. Orthographic projections allow us to represent the shape of an object using 2 or more views.
There are different types of lines used in engineering drawing. In oblique projection the object is aligned such that one face front face is parallel to the projection plane. It is a basic requirement and learned early in drafting instruction.
The standard views used in a three-view drawing are the top front and the right side views. All other lines contrast with the visible lines by having either a thinner weight. 2 The Language of Lines Object Line.
423 Drawing of an Ellipse Md. The outline or object line is represented by thick line and is used to show the outer visible feature of the object in the drawing. Basic Types of Lines Used in Engineering Drawings By Kelly Curran Glenn Sokolowski.
An arrowhead is approximately 3 mm long and 1 mm wide. Draw the line firmly with a free and easy wrist-and-arm motion. The first dimension line.
What is line in basic technology. Engineering Working Drawings Basics Page 8 of 22 parallel to the object surface. CONSTRUCTION LINE Very light and thin line use to construct layout work.
Figure 23 - Dimensioned Drawing. Spacing should be approximately 3 mm and at an angle of 45C. They are drawn as solid lines with a thickheavy weight.
The article talks about Line Types and Dimensions in Engineering drawing. The most fundamental parameter to define any engineering design is a point. DIMENSION LINE Thin and dark lines use to show the size span of an object with a numeric value.
It is assumed that an object is placed in front of a screen and light projected on the object assuming that the rays of light to be parallel to each other and perpendicular to the screen then a true shadow of. 1o a visible edge being represented by a full line and an invisible one by a dotted line ie a line made up of short dashes. That is the length is roughly three times the width.
Visible lines are the edges or outlines of an object. 1 PARALLEL LINES AND SLOPING LINES Figure 2. Object lines stand out on the drawing and clearly define the outline and features of the object.
A quiz completes the activity. Drawing is the standard used in engineering and technology because many times the other three principal views are mirror images and do not add to the knowledge about the object. Roknuzzaman Department of Civil Engineering HSTU Page 36 fExercise and Assignments 1.
Draw a circle touching three points A B and C with coordinates A 00 B 020 and C 150. Section line or hatching line. Here are a few examples.
An orthographic projection is a system of drawings that represent different sides of an object. Section lines are thin uniformly spaced lines that indicate the exposed cut surfaces of an object in a sectional view. Object lines Figure 3 are the most common lines used in drawings.
