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Machining surface finish chart, comparator, method, degree, Ra, Rz,
RMS
As for machining to iron and steel
castings, the surface finish smooth degree is also an important
requirement. The following is the conversion chart is from dandong
foundry, for Ra (um), Ra
(micro inch), Rz (um), RMS and finish degree in China and USA,
including the related finish methods.
|
China
Finish Degree |
China
Ra (um) |
China
Rz (um) |
USA
Ra (um) |
USA Ra
(micro inch) |
USA RMS
(micro inch) |
Machining Finish
Method
refer to iron-foundry.com |
|
1 |
50 |
200 |
50.0 |
2000 |
2200 |
The most coarse
machining or good rough casting surfaces |
|
2 |
25 |
100 |
25.0 |
1000 |
1100 |
Machining marks
very obvious.
Rough turning, boring, planning, drilling. |
|
3 |
12.5 |
50 |
12.5 |
500 |
550 |
Machining marks
obvious.
Rough turning, planning, milling, drilling. |
|
4 |
6.3 |
25 |
8.00 |
320 |
352 |
Machining marks
visible.
Normal turning, boring, planning, drilling, grinding. |
|
6.30 |
250 |
275 |
|
5 |
3.2 |
12.5 |
5.00 |
200 |
220 |
Machining marks
not obvious, but still visible.
Normal turning, boring, planning, drilling, grinding. |
|
4.00 |
160 |
176 |
|
3.20 |
125 |
137.5 |
|
6 |
1.6 |
6.3 |
2.50 |
100 |
110 |
Machining marks
blur, but marks direction obvious.
Number controlled turning, boring, planning, drilling,
grinding. |
|
2.00 |
80 |
88 |
|
1.60 |
63 |
69.3 |
|
7 |
0.8 |
6.3 |
1.25 |
50 |
55 |
Machining marks
direction blur, but still visible.
Number controlled turning, boring, planning, drilling,
grinding. |
|
1.00 |
40 |
44 |
|
0.80 |
32 |
35.2 |
|
8 |
0.4 |
3.2 |
0.63 |
25 |
27.5 |
Machining marks
direction blur.
Reaming, grinding, boring, rolling. |
|
0.50 |
20 |
22 |
|
0.40 |
16 |
17.6 |
|
9 |
0.2 |
1.6 |
0.20 |
12.5 |
13.75 |
Machining marks
direction invisible.
Grinding, super machining. |
|
10 |
11 |
|
8 |
8.8 |
|
10 |
0.1 |
0.8 |
0.10 |
4 |
4.4 |
Surface dark
gloss.
Super machining. |
The photos of surface finish
comparator for milling, turning, reaming and grinding
 
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