cách vẽ hình chiếu thứ 3
TRANSCRIPT
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Bi ging V k thut
CCH V HNH CHIU TH 3T HAI HNH CHIU CHO
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Bi ging V k thut
1. Mi quan h gia cc hnh chiuCho thc ca im A nh hnh v:
Nhn xt:
- Hnh chiu ng A1c xc nh bi OAx vOAz
- Hnh chiu bng A2c
xc nh bi OAx
v OAy
- Hnh chiu cnh A3c
xc nh bi OAy v OAz
3
2
1
y
A
Oy
A
z
A
x
Ay
Ay
zA
xA
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Bi ging V k thut
+ Hnh chiu ng v hnh chiubng c chung kch thc songsong vi trc Ox ( xa cnh)+ Hnh chiu bng v hnh chiucnh c chung kch thc songsong vi trc Oy ( xa)+ Hnh chiu cnh v hnh chiung c chung kch thc songsong vi trc Oz ( cao)
3
2
1
y
A
O
y
A
z
A
x
Ay
Ay
zA
xA
i vi cc hnh chiu ca im:
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Bi ging V k thut
i vi cc hnh chiu ca vt th:
- Hnh chiu ng v hnh chiu bng ca vtth c lin h ging ng, do c chungkch thc ngang (kch thc di)
- Hnh chiu ng v hnh chiu cnh ca vtth c lin h ging ngang, do c chungkch thc cao
- Hnh chiu bng v hnh chiu cnh ca vtth c chung kch thc su (kch thcrng)
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Bi ging V k thut
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Bi ging V k thut
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Bi ging V k thut
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Bi ging V k thut
2.c bn vc bn v l nghin cu cc hnh biu din cho hiu
c hnh dng, kt cu ca vt th.
Trnh t c bn v:
- Xc nh hng chiu cho tng hnh chiu, theo cchng t trc, t trn hnh dung ra mt trc,mt trn ca vt th.
- Phn tch ngha cc ng nt trn tng hnhchiu, mi quan h gia cc ng nt trn cchnh chiu.
- Tng hp nhng iu phn tch trn hnhdung ra hnh dng ca vt th cn biu din.
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Bi ging V k thut
3. Cc v d
V hnh chiu cnh ca vt th cho nh hnh v
Trnh t thc hin:- c bn v- V hnh chiu cnh
v hnh chiu th 3 ca mt vt th c ddng, thng phn tch vt th thnh cc b phnn gin hn. V hnh chiu th 3 ca tng b phn
v tp hp li c hnh chiu th 3 ca ton bvt th.Nguyn tc chung l v phn thy trc phn khutsau, b phn ch yu trc b phn th yu sau
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Biu din giao tuyn cc b mt trn vt th (T.77-81 GT)
Giao 2 mt tr
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Cho 3 hnh chiu thng gc v cha y ca mt s vtth. Hy v b sung cc nt v cn thiu trn cc hnh
chiu .
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Cho 2 hnh chiu thng gc ca mt s vt th. Vhnh chiu th 3 ca chng theo hai hnh chiu
cho
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Bi tp 1: V hnh chiu th 3 t 2 hnh chiu cho54
90
15
13
7
54
14
90
26
9
54
30
42
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54
90
15
13
7
54
14
90
26
9
54
30
42
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54
90
15
13
7
54
14
90
26
9
54
30
4
2
54
54
15
713
26
30
54
42
14
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Bi tp 2: V hnh chiu th 3 t 2 hnh chiu cho
R18
20
36
80
64
8 15
120
28
12
42
13
50
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R18
20
36
80
64
8 15
120
28
12
42
13
50
-
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50
-
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13
42
12
28
120
158
64
80
36
20
R18
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Bi tp 3: V hnh chiu th 3 t 2 hnh chiu cho36
22
48
1
2
18
30
9
22
48
14
36
14
18
50
R7
22
36
22
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22
48
12
18
30
9
22
48
14
36
14
18
50
R7
22
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32
-
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36
22
48
12
18
3
0
9
22
14
36
14
1850
14
32
7
12
9
3
0
50
18
R7
22