TITLE: Introduction to technical drawing
Course/Level: Building projects / First Course
Scale drawing appears due to the need of depicting objects with accuracy avoiding draw them in real size. From this need and thanks to math theory about proportions, we have developed scale drawing. In Technologies, technical drawing is crucial since the best way to define any development is through its depict. In this unit we will deal the basis on scale drawing.
The real world often give us several opportunities to put in practice the knowledge that we are going to teach in this unit. Many times, we have to depict too big or small objects that would be impossible to do using a direct scale in a drawing paper. That is why we must enlarge or reduce these objects in order to be represented. However, this can’t be done arbitrarily but complying the proportionality rules. In addition we should show what scale has been used so that those who are going to deal with the drawing have in every moment all the information about it in order to build the model.
OBJECTIVES:
- Draw real objects working out the proper scale in order to fit the object to the drawing paper.
- Work out the real size of a scaled draw.
- Use the technical drawing vocabulary.
- Use the following structures:
- Present simple
- Passive
- Commands
- Obligations and prohibitions
- Understand basic linkers.
C O N C E P T M A P
More details of the unit are availableHERE.... Plantilla complete.
SESSIONS:
SESSION 1:
Introduction to scales:
Thevocabulary sheetswill be delivered and some words and linkers will be explained.
A video from NASA that justify why to use scales in engineering will be watched in class.
A video from Virtual Nerd that introduces the calculus of scales will be the video.
At the end of the session, making groups of four or five, students will explain to each other the content of the videos.
As a homework, students will make a list of reasons why scales are needed, and the steps we have to take in order to draw to scale.
SESSION 2:
Reduction and Enlargement scales:
The teacher will explain how to distinguish reduction and enlargement scales, as well as how to decide which of them to use.
With the computers we will do the activity designed ineducaplaythat is a game that consists in to choose the correct scale in each case.
Then, students will do a list of five objects so that they choose if a reduction or enlargement scale is needed. Once they have done the activity, they will have to show to each other why they chose every scale.
SESSION 3:
Let’s go into action:
Read the document “scaleDrawing”, where how to draw to scale and several examples are given.
To reinforce the contents above, we will use the “Scales” and “Scales2” which are two guided documents where the process of working out scales and real sizes are totally explained. These are the typical “fill the gaps” exercises.
Specific vocabulary must be explained like words used to referring dimensions: height, width, depth, length.
Passive structure must be clarify.
Exercises of the documents “Scales” and “Scales2”
SESSION 4,5, 6, 7:
Let’s revise:
Since not too many students have reached the objectives in just one session, we have to think that more sessions for training are needed.
This session and the three following ones will be dedicated to reinforce the knowledge that it is supposed to know now. We will be doing exercises about scales using the drawing tools, and making presentations in class about how to deal with scales. This presentations will be carried out by the students.
Several real objects will be delivered in order to be drawn by students in a drawing paper.
As a final project, and working in groups of four or five, students will draw using the proper scale the plan of our class. Of course, they will use the tape measure.
Obviously, new vocabulary related to tools will be introduced. If you want to go in depth with this matter you can use this document aboutTools.
Juan Remigio Galán Gamonales.
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