IPC-CM-770D-1996 - 第168页

IPC-CM-770 Januaty 1996 Appendix A Metric Conversion Tables - mm to Inch Conversion Whenever possible, metric dimensions have been used in are added together, the conversion concept may differ from this standard. In some…

100%1 / 176
January
1996
IPC-CM-770
30.6.5.5 Combination Methods
These solder extraction
methods provide controlled combinations of heat, pressure,
vacuum, and airflow for the controlled removal of any sol-
der joint configuration. Advantages: This solder removal
method is easily manipulated, fully controllable and allows
a trained and skilled operator to easily remove solder and
components from most types of assemblies.
A. Solder Extraction (Continuous Vacuum) This method
uses a hollow soldering iron and tip to melt the solder and
after the solder is molten, the solder is sucked out of the
solder joint by an operator controlled vacuum pump. This
method can also be used for clinched leads, blindhlocked
holes, and auxiliary heating.
B.
Solder Extraction (Pressure Mode) This method uses a
hollow soldering iron and tip to melt the solder and after
the solder is molten, to blow it out of the solder joint by an
operator controlled vacuudpressure pump. This solder
extractor pressure method is suitable for removing solder
from blind or blocked component lead mounting holes.
30.6.5.6 Clip-and-Fix Method
In the clip-and-fix
method, the component leads of the component to be
removed are cut
off
at (or near) the component body. This
is generally not performed when the component to remove
is thought to be good. In some cases it may be desirable to
remove individual component leads with a small jet of hot
air. After solder melt the component lead is lifted
off
the
land.
30.6.6 Replacement of Surface Mounted Devices
The
general requirements and procedures for surface mounted
components are in IPC-A-610.
Prior to replacement, the surface mount component and the
land patterns on the printed board structure may have to be
hot air leveled, or pretinned and fluxed. The component
must then be precisely positioned on the land pattern and
stabilized (held in place) during solder reflow and cool
down.
CAUTION: Hot air leveling can cause undesirable over-
heating of the component, adjacent components, solder
joints, and the printed board structure.
It is not recommended, but hand soldering replacement
with a microscope aid can be successful.
6-3
1
COPYRIGHT Association Connecting Electronics Industries
Licensed by Information Handling Services
COPYRIGHT Association Connecting Electronics Industries
Licensed by Information Handling Services
IPC-CM-770
Januaty
1996
Appendix A
Metric Conversion Tables
-
mm
to Inch Conversion
Whenever possible, metric dimensions have been used in are added together, the conversion concept may differ from
this standard. In some instances minor inconsistencies requirement to requirement. (In some instances, the number
exist, specifically where information is provided that is is rounded higher and, in some, lower.
taken from other industry or government standards where
hard conversion was not possible. In addition, in order to
maintain mathematical continuity between dimensions that
Shown below are metric to inch conversions. Dimensions
noted in bold script are soft conversions.
o.06
mm
0.08 [.O031
0.1 [.O041
0.1 3 [.O051
0.1
5
[.O061
0.2 [.O081
0.25
[.O1
O]
0.3
[.O1
21
0.35
[.O1
41
0.38
[.O1
51
0.4
[.O1
61
0.46
[.O1
81
0.48
[.O1
91
0.5
[.O201
0.56 [.O221
0.6 [.O241
0.63 [.O251
0.7 [.O281
0.75 [.O301
0.762 [.O301
0.8 [.O321
0.85 [.O331
0.9 [.O361
l.0Q
mm
1
.O
[.O401
1
.O2 [.O401
1.1
[.O441
1.1
4 [.O451
1.2 [.O481
1.27 [.O501
1.3 [.O511
1.4 [.O551
1.5 [.O591
1.5 [.O601
1.6 [.O631
1.7 [.O671
1.8 [.O701
1.8 [.O711
1.9 [.O751
2.00
mm
2.0 [.O791
2.0 [.O801
2.1 [.O831
2.2 [.O871
2.3 [.O901
2.4 [.O951
2.5 [.O981
2.5
[.loo]
2.54 [.loo]
2.6 [.l O21
2.7 [.l O61
2.8 [.11 O]
2.9 [.114]
3-06
mm
3.0 [.118]
3.05 [.120]
3.1 [.122]
3.2 [.126]
3.3 [.130]
3.4 [.134]
3.5 [.138]
3.6 [.140]
3.6 [.142]
3.7 [.146]
3.8 [.150]
3.9 [.154]
4,QO
mm
4.0
[.
1581
4.1 [.162]
4.2
[.
1661
4.25
[.
1671
4.3
[.
1701
4.4 [.174]
4.5
[.
1781
4.6 [.181]
4.6
[.
1821
4.7 [.186]
4.8 [.188]
4.8 [.190]
4.9 [.190]
4.9
[.
1951
5.QO
mm
5.0
[.195]
5.0
[.198]
5.0
[.200]
5. 08 [.200]
5.1 [.200]
5.2 [.205]
5.3 [.209]
5.4 [.21
O]
5.4 [.213]
5.5 [.217]
5.6 [.220]
5.7 [.224]
5.8 [.228]
5.9 [.232]
6,OQ
mm
6.0 [.235]
6.0 [.236]
6.1 [.240]
6.2 [.244]
6.3 [.248]
6.4 [.252]
6.5 [.256]
6.6 [.260]
6.7 [.264]
6.8 [.265]
6.8 [.268]
6.9 [.270]
3.06
mm
7.0 [.275]
7.0 [.276]
7.1 [.280]
7.2 [.284]
7.3 [.287]
7.4 [.290]
7.5 [.295]
7.5 [.300]
7.6 [.299]
7.6 [.300]
7.62 [.300]
7.7 [.300]
7.8 [.307]
7.9 [.311]
8,QO
mm
8.0 [.315]
8.05 [.317]
8.1 [.319]
8.1 3 [.320]
8.2 [.323]
8.3 [.328]
8.4 [.330]
8.5 [.335]
8.6 [.335]
8.6 [.339]
8.7 [.340]
8.8 [.345]
8.8 [.347]
8.9 [.350]
9.00
mm
9.0 [.354]
9.1 [.358]
9.2 [.362]
9.28 [.365]
9.3 [.365]
9.4 [.370]
9.5 [.378]
9.6 [.378]
9.6 [.380]
9.65 [.380]
9.7 [.382]
9.78 [.385]
9.8 [.386]
9.9 [.390]
1
Q,OO
mm
10.0 [.390]
10.0 [.395]
10.03 [.395]
10.1 [.398]
10.1 6 [.400]
10.2 [.400]
10.3 [.406]
10.4 [.41 O]
10.5 [.413]
10.6 [.415]
10.67 [.420]
10.7 [.421]
10.8 [.425]
10.9 [.430]
If,#Q
mm
11
.O
[.433]
1
l.
1
[.435]
11.2 [.441]
11.3 [.445]
11.4 [.450]
11.5 [.453]
11.56 [.453]
11.6 [.460]
11.61 [.457]
11.7 [.461]
11.8 [.465]
11.86 [.467]
11.9 [.469]
11.94 [.470]
I
2.00
mm
12.0 [.470]
12.0 [.472]
12.0 [.475]
12.1 [.476]
12.1 [.480]
12.1 9 [.480]
12.2 [.480]
12.3 [.484]
12.32 [.485]
12.4 [.488]
12.5 [.490]
12.57 [.495]
12.6 [.495]
12.7 [.500]
12.8 [.504]
12.9 [.508]
12.95 [.51 O]
13.00
mm
13.0 [.51
O]
13.1 [.516]
13.2 [.520]
13.21 [.520]
13.3 [.525]
13.4 [.530]
13.46 [.530]
13.5 [.530]
13.59 [.535]
13.6 [.535]
13.7 [.539]
13.8 [.540]
13.8 [.544]
13.9 [.547]
I
4.~0
mm
14.0 [.550]
14.0 [.551]
14.1 [.555]
14.2 [.559]
14.3 [.563]
14.4 [.565]
14.48 [.570]
14.5 [.570]
14.6 [.575]
14.7 [.579]
14.73 [.580]
14.8 [.583]
14.86 [.585]
14.9 [.587]
f5AO
mm
15.0 [.590]
15.1 [.595]
15.1
1
[.595]
15.2 [.598]
15.2 [.600]
15.24 [.600]
15.3 [.602]
15.4 [.606]
15.5 [.610]
15.6 [.615]
15.7 [.618]
15.75 [.620]
15.8 [.622]
15.9 [.626]
16.00
mm
16.0 [.630]
16.1 [.634]
16.2 [.638]
16.3 [.640]
16.34 [.643]
16.4 [.645]
16.5 [.650]
16.6 [.656]
16.68 [.657]
16.7 [.658]
16.8 [.661]
16.9 [.665]
IT.W
mm
17.0 [.665]
17.0 [.668]
17.0 [.670]
17.02 [.670]
17.1 [.673]
17.2 [.677]
17.27 [.680]
17.3 [.681]
17.4 [.685]
17.5 [.689]
17.5 [.690]
17.6 [.690]
17.6 [.693]
17.65 [.695]
17.7 [.700]
17.78 [.700]
17.8 [.701]
17.9 [.705]
18.00
mm
18.0 [.709]
18.0 [.71
O]
18.03 [.71 O]
18.05 [.71
O]
18.1 [.713]
18.2 [.717]
18.29 [.720]
18.3 [.720]
18.4 [.725]
18.5 [.730]
18.54 [.730]
18.6 [.730]
18.7 [.736]
18.8 [.740]
18.85 [.742]
18.9 [.744]
19.00
mm
19.0 [.745]
19.0 [.750]
19.05 [.750]
19.1 [.751]
19.2 [.756]
19.25 [.758]
19.3 [.760]
19.4 [.765]
19.5 [.766]
19.5 [.768]
19.56 [.770]
19.6 [.770]
19.7 [.776]
19.8 [.780]
19.9 [.783]
19.94 [.785]
6-32
COPYRIGHT Association Connecting Electronics Industries
Licensed by Information Handling Services
COPYRIGHT Association Connecting Electronics Industries
Licensed by Information Handling Services
Januaw
1996
IPC-CM-770
20.0 [.785]
20.0 [.787]
20.0 [.790]
20.05 [.790]
20.1 [.791]
20.1 9 [.795]
20.2 [.795]
20.3 [.800]
20.32 [.800]
20.4 [.800]
20.5 [.81
O]
20.57 [.81 O]
20.6 [.811]
20.7 [.815]
20.8 [.819]
20.9 [.823]
21
.ao
mm
21
.O
[.825]
21
.O
[.830]
21.1 [.831]
21.2 [.835]
21.3 [.840]
21.4 [.840]
21.4 [.842]
21.5 [.845]
21.6 [.850]
21.7 [.854]
21.8 [.858]
21.9 [.862]
22.00
mm
22.0 [.865]
22.0 [.866]
22.0 [.868]
22.1 [.870]
22.2 [.874]
22.3 [.878]
22.4 [.880]
22.5 [.886]
22.6 [.890]
22.7 [.894]
22.8 [.898]
22.86 [.900]
22.9 [.900]
23.00
mm
23.0 [.905]
23.1 [.909]
23.1 2 [.91 O]
23.2 [.915]
23.3 [.917]
23.4 [.921]
23.5 [.925]
23.6 [.929]
23.7 [.933]
23.8 [.937]
23.88 [.940]
23.9 [.940]
24.00
mm
24.0 [.945]
24.1 [.950]
24.1 2 [.950]
24.2 [.950]
24.2 [.953]
24.3 [.957]
24.38 [.960]
24.4 [.960]
24.5 [.966]
24.6 [.970]
24.64 [.970]
24.7 [.972]
24.8 [.976]
24.9 [.980]
25.09
mm
25.0 [.980]
25.02 [.985]
25.1 [.988]
25.2 [.995]
25.27 [.995]
25.3 [.996]
25.4 [l .O001
25.5 [l .O041
25.6 [l .O081
25.65 [l .O1 O]
25.7 [l .O1 21
25.8 [l .O1 61
25.9 [l .O201
26.00
mm
26.0 [1.025]
26.1 [l .O281
26.2 [l .O311
26.3 [l .O351
26.4 [1.040]
26.5 [1.040]
26.5 [1.045]
26.6 [1.050]
26.65 [1.050]
26.7 [1.050]
26.8 [l .O551
26.9 [l .O591
27.00
mm
27.0 [1.060]
27.0 [l .O631
27.1 [1.065]
27.2 [1.070]
27.3 [l .O751
27.4 [1.080]
27.5 [l .O831
27.6 [l .O871
27.7 [1.090]
27.8 [l .O951
27.9 [l .O981
27.94 [1.100]
28.00
mm
28.0
[1.1
O51
28.1 [1.1 O61
28.2 [1.110]
28.3
[1.115]
28.4 [1.120]
28.5 [1.122]
28.6 [1.125]
28.7 [1.130]
28.8 [1.134]
28.9 [1.138]
28.91 [1.139]
29.00
mm
29.0 [1.140]
29.1 [1.145]
29.2 [1.150]
29.3
[1.155]
29.4 [1.158]
29.5 [1.162]
29.6 [1.165]
29.7 [1.170]
29.8 [1.173]
29.9 [1.177]
30.00
mm
30.0 [1.180]
30.1 [1.185]
30.2 [1.190]
30.3 [1.193]
30.35 [1.195]
30.4 [1.200]
30.48 [1.200]
30.5 [1.200]
30.6 [1.205]
30.7 [1.21
O]
30.75 [1.21 O]
30.8 [1.213]
30.9 [1.217]
al
.o0
mm
31
.O
[1.220]
31.1
[1.225]
31.2 [1.230]
31.3 [1.232]
31.4 [1.235]
31.5 [1.240]
31.6 [1.245]
31.7 [1.250]
31.75 [1.250]
31.8 [1.252]
31.9 [1.256]
32.00
mm
32.0 [1.260]
32.1 [1.264]
32.2 [1.265]
32.25 [1.270]
32.3 [1.270]
32.4 [1.275]
32.5 [1.280]
32.6 [1.285]
32.7 [1.287]
32.75 [1.290]
32.8 [1.290]
32.9 [1.295]
33.3
21.31 l]
38.00
mm
33.4 [1.315]
33.5
[1.320]
33.6 [1.323]
33.7 [1.325]
33.8 [1.330]
33.9 [1.335]
38.0 [1.496]
38'1
'5001
38'2
[l
'5051
38.3 [1.508]
38.4 [1.512]
38.5
[1.515]
34.0
[1.335]
38.7 [1.5251
34.02 [1.339]
38-8
-5281
34.00
mm
38.6 [1.520]
34.1 rl.3401
38.9 [1.530]
34.2 i1.3453
39.00
mm
34.3 [1.350]
34.4 [1.354]
34.5 [1.358]
34.56 [1.361]
34.6 [1.362]
34.7 [1.365]
34.8 [1.370]
34.9 [1.375]
'
39'0
'5351
39.1
[l
.5401
39.2
[l
.5401
39.3
[l
.5451
39.4
[l
.5501
39'5
'5551
39.6
[l
.5601
39.7 [1.563]
35.0 [1.378]
39.9
[l
.5701
35.1
[1.380]
49,90
mm
35-18 [lm3851 40.0
[I
,5751
35.2 [1.3851 40.1 [1.580]
35.3 [1-3901 40.15 [1.580]
35.4 [1.3951 40.2 [1.583]
35-43 [1-3951 40.3 [1.587]
35.5
[1.3981 40.4 [1.590]
35-6
m4021
40.5 [1.595]
35.7 [lm4051 40.6
[I
,6001
35-8
m41
O1
40.7 [1.602]
35.9 [1.4151 40.8 [1.605]
40.9 [1.61 O]
35,90
mm
39.8 [1.565]
36.09
mm
36.0 [1.415]
41
,O9
mm
36.1 [I .421]
41
.O
[1.615]
36.2 [1.425]
41.1 [1.620]
36.3 [1.430]
41.1 5 [1.620]
36.4 [1.435]
41.2 [1.622]
36.5 [1.440]
41.3 [1.625]
36.6 [1.440]
41.4 [1.630]
36.6 [1.441]
41.5 [1.635]
36.7 [I .445]
41.6 [1.638]
36.8 [1.450]
41.65 [1.640]
36.9 [I .453] 41.7 [1.640]
37*09
mm
41.9 [1.650]
41.8 [1.645]
37.0 [1.445]
37.1 [1.460]
42.00
mm
37.2 [1
42.0 [1.655]
37.3 [1.470]
42.1 [1.655]
37.35 [1 .470]
42.1 5 [1.660]
37.4 [1.473]
42.1 8 [1.661]
37.5 [1.476]
42.2 rl.6601
42.3 [1.665]
42.4 [1.670]
42.5 [1.675]
42.6 [1.677]
42.7 [1.680]
47.5 [1.870]
47.6 [1.875]
47.7 [1.878]
47.8 [1.880]
47.9 rl.8851
43.0 [1.695]
43.05 [1.695]
43.1 [1.697]
43.2 [1.700]
43.3 [1.705]
43.4 [1.71
O]
43.5 [1.713]
43.6 [1.715]
43.7 [1.720]
48.0 [1.890]
48.1 [1.895]
48.2 [1.900]
48.3 [1.900]
48.3 [1.902]
48.4 [1.905]
48.5 [1.91
O]
48.6 [1.915]
48.7 [1.917]
48.8 [1.920]
48.9 rl.9251
43.8 [1.725]
43.9 [1.728]
Ia
49-00
mm
44-00
mm
49.0 [1.930]
49.1 [1.933]
49.2 [1.935]
49.3 [1.940]
49.4 [1.945]
49.5 [1.950]
49.6 [1.953]
49.7 [1.955]
49.8 [1.960]
49.9 [1.965]
44'0
[l
'7321
44'1
[l
'7351
44'2
'7401
44'3
[l
'7451
44'4
'7481
44'5
[l
'7501
44'6
[l
'7551
44'7
'7601
44.8 [1.765]
44.9 [1.768]
50.00
mm
45,OQ
mm
50.0
[1.970]
45.0 [1.772]
50-1
[1-9721
45.1 [1.775]
50.2
[l
.9751
45.2 [1.780]
50-3
-9801
45.3 [1.783]
50.4
[l
.9851
45.4 [1.787]
50-5
45.5 [1.790]
50-6
[1-9921
45.6 [1.795]
50.7
[l
.9951
45.7 [1.800]
50-8
[2-ooo]
45.8 rl.8031
50.9 [2.004]
45.9 i1.807j
46,OQ
mm
46.0 [1.81
O]
46.1 [1.815]
46.2 [1.820]
46.3 [1.823]
46.4 [1.825]
46.5 [1.830]
46.6 [1.835]
46.7 [1.840]
46.8 [1.843]
46.9 [1.845]
43.06
mm
47.0 [1.850]
47.1
[
1.8551
47.2 [1.860]
47.3 [1.862]
47.4 [1.865]
51
.ao
mm
51.2 [2.015]
51.8 [2.039]
51.8 [2.040
52.34 [2.061]
53.2 [2.095]
54.3 [2.140]
6-33
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COPYRIGHT Association Connecting Electronics Industries
Licensed by Information Handling Services