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LUKISAN GEOMETRI BONGKAH ORTOGRAFIK ISOMETRI

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Page 1: LUK BONGKAH

LUKISAN GEOMETRI BONGKAH

ORTOGRAFIKISOMETRI

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Pandangan Ortografik

2 jenis unjuran ortografika. Unjuran sudut pertamab. Unjuran sudut ketiga

Simbol unjuran ortografik

Unjuran sudut pertama Unjuran sudut ketiga

a) First angle projection - Is the traditional British system of projection and it is also referred to as “European Projection “

b) Third angle projection - It is sometimes called as “ American Projection “ is gaining popularity. All government engineering establishments and civilian contracting.

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Times are required to use this farm of projection.Both method of projection are quoted in The British Standard Handbook, BS 308 Part I. General Principles of Engineering Drawing Practice.

Basic requirements and Quadrants’ usage to determine the 1st angle and 3nd angle projection.

a. Two principal planesi. Vertical Planeii. Horizontal Plane

b. Normally longest object length be use as front elevation.

c. Minimize the use of hidden lines.

d. Choose the side of the object with most details as the side / end elevation.

4th 3rd

1st 2nd

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1st Angle

VERTICAL PLANE

HORIZONTAL PLANE

Pelan tegak hadapan

Pelan

SUDUT PERTAMA (FIRST ANGLE)

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SIDE VERTICAL PLANE

SUDUT PERTAMA (FIRST ANGLE)

PELAN

PELAN TEGAK HADAPAN PELAN TEGAK SISI

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SUDUT KETIGA. (THIRD ANGLE)

PELAN

PELAN TEGAK HADAPAN

PELAN

PELAN TEGAK HADAPAN

OBJEK

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PELAN

PELAN TEGAK HADAPAN PELAN TEGAK SISI

PELAN

PELAN TEGAK HADAPAN

PELAN TEGAK SISI

SUDUT KETIGA. (THIRD ANGLE)

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LUKISAN ISOMETRI

Isometric mean equal measure. It is taken from Greek word.

ISOS means equal. METRON means measure.

Metric is a French word meaning a system of measure.

Hence these two words ISOS and METRIC are combined into one single word ISOMETRIC means equal measure.

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Type of Isometric Drawing

a. Normal axis

30° 30°

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b. Reverse axis

30°30°

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Circle in isometric view

a

b

c

d

o

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Kaedah melukis pandangan isometri

i. Kaedah Kotak

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Kaedah melukis pandangan isometri

ii. Kaedah Kerangka

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Kaedah melukis pandangan isometri

iii. Kaedah Titik Koordinat

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N'

N

Contoh

Komponen kemahiran

1. Garisan isometri

2. Garisan bukan isometri

3. Garisan lengkung

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Contoh 2

Komponen kemahiran

1. Garisan isometri2. Garisan bukan

isometri3. Garisan lengkung4. Bulatan