machining surface finish chart, conversion, comparator, method, degree, ra, rz, rms
DESCRIPTION
Comparator Machining Surface FinishTRANSCRIPT
2/12/2015 Machining surface finish chart, conversion, comparator, method, degree, Ra, Rz, RMS
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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 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
1 50 200 50.0 2000 2200The most coarse machining or good rough casting
surfaces
2 25 100 25.0 1000 1100Machining marks very obvious.
Rough turning, boring, planning, drilling.
3 12.5 50 12.5 500 550Machining marks obvious.
Rough turning, planning, milling, drilling.
4 6.3 258.00 320 352 Machining marks visible.
Normal turning, boring, planning, drilling, grinding.6.30 250 275
5 3.2 12.5
5.00 200 220Machining 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 27.5Machining 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 13.75Machining marks direction invisible.
Grinding, super machining.10 11
8 8.8
10 0.1 0.8 0.10 4 4.4Surface dark gloss.
Super machining.
The photos of surface finish comparator for milling, turning, reaming and grinding
2/12/2015 Machining surface finish chart, conversion, comparator, method, degree, Ra, Rz, RMS
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