Technical Drawing in Photonics

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Lesson 12

Axonometric projections.

Dr. Zsolt István Benkő

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Technical drawing in Photonics

Axonometric projections are for easy visualization of the objects.

This kind of projection is a compromise: the correct values can be measured parallel to an axis and it gives a good image of the objects in a single view but all other dimensions (not parallel to any axis) are distorted.

Three types are used mainly:

1.Isometric projection

2.Dimetric projection – frontal projection (cabinet projection) 3.Dimetric projection – classical (or 7:8) projection

Isometric uses the same scale for all axes (1:1). Dimetric uses 1:1 scale on two axes and one half scale on the 3^rd axis.

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120^o 120^o

120^o

Isometric projection z(1:1)

x(1:1) y(1:1)

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135^o

Frontal projection (cabinet projection)

x(1:2)

y(1:1) z(1:1)

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Frontal projection (cabinet projection)

135^o 135^o

y(1:2) x(1:1)

z(1:1)

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8 8

7

1

Classical (7:8) projection

x(1:2)

y(1:1) z(1:1)

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Classical (7:8) projection

8 8

7

x(1:1)1

y(1:2) z(1:1)

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References

1. Ocskó Gy., Seres F.: Gépipari szakrajz, Skandi-Wald Könyvkiadó, Budapest, 2004

2. Lőrincz P., Petrich G.: Ábrázoló geometria, Nemzeti Tankönyvkiadó Rt., Budapest, 1998

3. Pintér M.: AutoCAD tankönyv és példatár, ComputerBooks, Budapest, 2006