DIBUJO TECNICO SEGUNDO ESO copia

TECHNICALDRAWING

2º ESO

UNIT

Technical drawing tools

1. set squares

1.1. DEFINITION

A "set square" is a particular type of tool/instrument that is similar to a ruler, but it's in the shape of a triangle.It makes it easy to draw straight lines, perpendicular lines, squares/rectangles, and certain triangles.The set square has one right (90°) angle, and two other angles which may be the same (both 45°) or different (e.g. 60° and 30°).

1.2. 45º set square

A 45 – 45 – 90 degree triangle (or isosceles right triangle) is a triangle with angles of 45°, 45°, and 90°. It has two equal angles (45º) and two equal legs with the same length.

1.2. 30º 60º set square

A 30 – 60 – 90 degree triangle (or scalene right triangle) is a triangle with angles of 30°,60°, and 90°. It has three different angles and three different sides.

1.3. HOW TO DRAW PARALLEL LINES

1. Place the 45º set square in position 1 and the 30º/60º set square in position 2 to draw the line.
2. Hold the 30º/60º set square with your left hand and slide the 45º set square along its hypotenuse to obtain parallel lines to the line.
3. With the 45º set square in its new position, draw a parallel line to the given one.

1.4. HOW TO DRAW perpendicular LINES

1. The 3Oº/60º set square is held in position with the left hand; the 45º set square is mobile and slides along the hypotenuse of the 30º/60º set square.
2. In the first position of the figure, draw the parallel line .Then place the 45º set square in the second position (rotate it 90º) and draw the line perpendicular to the first one.

VIDEO

VIDEO

2. COMPASS

2.1. DEFINITION

A compass is an instrument, usually metal, that you can use to draw circles or arcs, and to measure distances for constructions in geometry. It has two adjustable arms, one with a pointed metal tip and the other with a small mounted pencil. Some compasses have controls for locking the width of the arms and locking the height of the pencil tip and metal point.

2.2. how to draw with the compass

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

VIDEO

VIDEO

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

ejercise 1

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

ejercise 2

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.

1. Locate and mark the place where you want the center of your circumference.
2. Determine the radius. Make sure you know exactly how long the radius should be.
3. Put the compass point and pencil lead close to each other, and make sure they are set to roughly the same length. That will make the circumference easier to draw.
4. Widen the arms of the compass to the radius you want.
5. Place the metal point of the compass on the mark you made for the center of the circle.
6. Pressing evenly on the metal point and pencil, turn the knob at the top of the compass, moving the pencil point all the way around the circle.