Guide lines can be used to help produce neat lettering when drawing. Guide lines are a useful aid for creating accurate and neat layout.

Why must lettering on a drawing be neat and legible? You can produce excellent lettering if you learn the basic shapes of the letters, the proper stroke sequence for making them, and the recommended spacing between letters, words, and rows of lettering.

The American National Standards Engineering Drawing and Related Documentation Practices (ASME Y14/ANSI Y14) contains the most widely accepted set of engineering drawing standards in the United States.

Name two basic types of drawings developed by drafters. Original hard-copies and computer-rendered models.

For sketching, softer leads are better, such as F and HB. Very soft leads, such as the B grades, are best for pencil renderings and shadowing work. For light, preliminary layout work, 3H and 4H leads are best. Generally, the more “tooth” or roughness a paper has, the harder the lead should be.

Vertical lines are drawn with the triangle supported by the T-square. Inclined lines, making angles of 15°, 30°, 45°, 60°, and 75° with the horizontal, are made in a similar way. The protractor is used to form angles that cannot be made with the triangles.

A set square or triangle (American English) is an object used in engineering and technical drawing, with the aim of providing a straightedge at a right angle or other particular planar angle to a baseline.

roll-n-draw scales

Compass and a scale: We know that compass helps to draw arcs and scale helps to measure the distance between two points. We draw a line along the side of the set square such that the line covers the point P. So we get a set of parallel lines using a set square and a scale.

Drafting tools are instruments that can be used for measurement and layout of drawings or to improve consistency and the speed for creating standard drawing elements.

• Drawing tools. Pencil. Drafting board. T-square. Drafting machine. French Curves.
• Drawing materials. Drafting paper. Thick draft paper. Cloth. Tracing paper.

A combination square is primarily used for ensuring the accuracy of a 90-degree angle, measuring a 45-degree angle, measuring the center of a circular object, finding depth and simple distance measurements.

Use a second set square to measure 45 and 90 degree angles.

Protractor

Method 2 of 2: Through the Middle of a Line Segment

1. Draw a straight line. On a piece of paper, draw a line segment of any convenient length.
2. Pick any point on AB. Mark it, and label it O.
3. Grab a compass. Open the compass to a radius a little shorter than either AO or OB.
4. Strike two more arcs.
5. Draw the 90° angle.

Right angles measure 90 degrees. Obtuse angles measure more than 90 degrees.

Obtuse Angle Measure = (180 – acute angle measure) In the picture above, line segment DO intersects line segment OQ at point O and forms an angle DOQ measuring 120°. Thus, it is an obtuse angle.

45 Degree Angle

1. Construct a perpendicular line.
2. Place compass on intersection point.
3. Adjust compass width to reach start point.
4. Draw an arc that intersects perpendicular line.
5. Place ruler on start point and where arc intersects perpendicular line.
6. Draw 45 Degree Line.

Bisecting angles without a protractor

1. Place the compass on the vertex of the angle (point B). Draw an arc across each arm of the angle.
2. Place the compass on the point where one arc crosses an arm and draw an arc inside the angle.
3. Use a ruler to join the vertex to the point where the arcs intersect (D).

Answer. The angles which are multiples of 15 can only be constructed using ruler and compass. Rest of the angles can be constructed using protractor. For, 35 degree angle, first construct 70 degree (2 x 35) using protractor and then bisect that angle.

Each will be 60 degree. And bisect the line it will be 90 degree. Now bisect the 90 degre, it will give you 45 degree. Again bisect this 45 degree, you will get 22.5 degree.

question_answer Answers(4)

1. Draw a ray L of any length.
2. Taking centre as O draw an arc with any radius to cut the line L.
3. Label the intersecting point of L and the arc as B.
4. Taking centre as B draw an arc with the same radius taken before to cut the previous arc at C.
5. Join O and C and.
6. Draw an angle bisector OD to the and.

An acute angle is an angle that is more than 0° but less than 90°. Common examples of acute angles include: 15°, 30°, 45°, 60°, etc. A 90-degree angle, also known as a right angle, is an angle whose measure is equal to 90° is called a right angle.

Here are the steps to construct 40 degree angle with compass and ruler:

1. Draw a straight line of any measurement with the help of ruler.
2. Take your compass and draw an arc of any measurement.
3. Draw 90 degree angle.
4. Now draw 60 and 120 degree angles.

Construction of an Angle of 75° by using Compass (i) Take a ray OA. (ii) With O as centre and any convenient radius, draw an arc cutting OA at C. (iii) With C as centre and the same radius, draw an cutting the first arc at M.

Answer: acute angle-an angle between 0 and 90 degrees.

obtuse angle