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Orthographic
Projection
Arya CNC Technologies
Arya CNC Technologies
Orthographic projection
• Orthographic" comes from the Greek word for "straight
writing (or drawing)." This projection sho...
5
Orthographic projection is a parallel projection technique
in which the parallel lines of sight are perpendicular to the...
Six Principal Views
Arya CNC Technologies
Which Views to Present
Arya CNC Technologies
Arya CNC Technologies
Glass Box Approach
Arya CNC Technologies
Glass Box Approach
Arya CNC Technologies
Glass Box Approach
Arya CNC Technologies
Glass Box Approach
Arya CNC Technologies
Glass Box Approach
Arya CNC Technologies
Glass Box Approach
Arya CNC Technologies
Arya CNC Technologies
Drawing Sheet
Trimmed paper of
a size A0 ~ A4.
Standard sheet size
(ISO)
A4 210 x 297
A3 297 x 420
A2 420 x 594
A1 594 x 8...
Drawing Scales
Scale is the ratio of the linear dimension of an element
of an object shown in the drawing to the real line...
Drawing Scales
Designation of a scale consists of the word “SCALE”
followed by the indication of its ratio, as follow
SCAL...
Basic Line Types
Types of Lines Appearance
Name according
to application
Continuous thick line Visible line
Continuous thi...
Visible lines represent features that can be seen in the
current view
Meaning of Lines
Hidden lines represent features tha...
For Example
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1
2
3
Dimensioning
Arya CNC Technologies
Dimensioning
Arya CNC Technologies
Types of Dimensioning
Arya CNC Technologies
Types of Dimensioning
Arya CNC Technologies
Types of Dimensioning
Arya CNC Technologies
Dimensioning of Circles
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Dimensioning Radii
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Limits of Size
• All dimensions have minimum and maximum values
specified by the tolerance block.
• Tolerances accumulate ...
Fit Between Parts
Clearance Fit
Interference Fit Transition Fit
1. Clearance fit: The shaft maximum diameter is smaller th...
Drawing Layout
The Title Block Should Include :
• Title –Title of the Drawing
• Name –Name of the person who produced it
•...
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Orthographic projections

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Basics of Orthographic Projections

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Orthographic projections

  1. 1. Orthographic Projection Arya CNC Technologies
  2. 2. Arya CNC Technologies
  3. 3. Orthographic projection • Orthographic" comes from the Greek word for "straight writing (or drawing)." This projection shows the object as it looks from the front, right, left, top, bottom, or back, and are typically positioned relative to each other according to the rules of either “First Angle” or “Third Angle” projection. Arya CNC Technologies
  4. 4. 5 Orthographic projection is a parallel projection technique in which the parallel lines of sight are perpendicular to the projection plane MEANING Object views from top Projection plane 1 2 3 4 51 2 3 4 Arya CNC Technologies
  5. 5. Six Principal Views Arya CNC Technologies
  6. 6. Which Views to Present Arya CNC Technologies
  7. 7. Arya CNC Technologies
  8. 8. Glass Box Approach Arya CNC Technologies
  9. 9. Glass Box Approach Arya CNC Technologies
  10. 10. Glass Box Approach Arya CNC Technologies
  11. 11. Glass Box Approach Arya CNC Technologies
  12. 12. Glass Box Approach Arya CNC Technologies
  13. 13. Glass Box Approach Arya CNC Technologies
  14. 14. Arya CNC Technologies
  15. 15. Drawing Sheet Trimmed paper of a size A0 ~ A4. Standard sheet size (ISO) A4 210 x 297 A3 297 x 420 A2 420 x 594 A1 594 x 841 A0 841 x 1189 A4 A3 A2 A1 A0(Dimensions in millimeters) Arya CNC Technologies
  16. 16. Drawing Scales Scale is the ratio of the linear dimension of an element of an object shown in the drawing to the real linear dimension of the same element of the object. Size in drawing Actual size Length, size : Arya CNC Technologies
  17. 17. Drawing Scales Designation of a scale consists of the word “SCALE” followed by the indication of its ratio, as follow SCALE 1:1 for full size SCALE X:1 for enlargement scales (X > 1) SCALE 1:X for reduction scales (X > 1) Dimension numbers shown in the drawing are correspond to “true size” of the object and they are independent of the scale used in creating that drawing. Arya CNC Technologies
  18. 18. Basic Line Types Types of Lines Appearance Name according to application Continuous thick line Visible line Continuous thin line Dimension line Extension line Leader line Dash thick line Hidden line Chain thin line Center line NOTE : We will learn other types of line in later chapters. Arya CNC Technologies
  19. 19. Visible lines represent features that can be seen in the current view Meaning of Lines Hidden lines represent features that can not be seen in the current view Center line represents symmetry, path of motion, centers of circles, axis of axisymmetrical parts Dimension and Extension lines indicate the sizes and location of features on a drawing Arya CNC Technologies
  20. 20. For Example Arya CNC Technologies 1 2 3
  21. 21. Dimensioning Arya CNC Technologies
  22. 22. Dimensioning Arya CNC Technologies
  23. 23. Types of Dimensioning Arya CNC Technologies
  24. 24. Types of Dimensioning Arya CNC Technologies
  25. 25. Types of Dimensioning Arya CNC Technologies
  26. 26. Dimensioning of Circles Arya CNC Technologies
  27. 27. Dimensioning Radii Arya CNC Technologies
  28. 28. Limits of Size • All dimensions have minimum and maximum values specified by the tolerance block. • Tolerances accumulate in a chain of dimensions. • Accumulation can be avoided by using a single baseline. Arya CNC Technologies
  29. 29. Fit Between Parts Clearance Fit Interference Fit Transition Fit 1. Clearance fit: The shaft maximum diameter is smaller than the hole minimum diameter. 2. Interference fit: The shaft minimum diameter is larger than the hole maximum diameter. 3. Transition fit: The shaft maximum diameter and hole minimum have an interference fit, while the shaft minimum diameter and hole maximum diameter have a clearance fit Arya CNC Technologies
  30. 30. Drawing Layout The Title Block Should Include : • Title –Title of the Drawing • Name –Name of the person who produced it • Checked – Before manufacturing the drawings are normally checked. • Version –Many Drawings are amended , each revision must be noted. • Date – Date on which drawing was produced or amended • Notes – Any Notes relevant to the drawing • Scale - The scale of the drawing. • Company Name – Name of the company. • Projection – The Projection system used to create the drawing Arya CNC Technologies
  31. 31. Arya CNC Technologies

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