Surface Roughness Comparator Block Set Ra 0.025–6.3μm for Metal Machining Inspection

As standardized in ISO2632/I-1985                                                  This set contains standards for the six most important maching methods in the prevalent "AA”values.    These Surface Roughness is used to compare and determine the degree of the surface finished by comparision method and eye estimation or magnifying glass.The surface rough contrast blocks is made of 45 super carbor steel except the GCr15 which is using to flat lapping the sample block.                                                                           All 30 speciments are calibrated in u＂AA(Arithmetical Average)and in the metric equivalents um Ra.Classify and rough degree parameter as table .                                                                                             

Notice of Operation and Maintenace:   when working the surface rough contrat block should be as plssible as under the same condition with the  checked  workpiece  (including Surfacecolour illuminating condition etc) and it is forbidden to contact the surface rough contrast block direct by hand. Antirust treatment should be strictly followed to avoid corrosion and strike and scrape should be avoided.

um

uin

um

uin

um

uin

um

uin

um

uin

12.5

500

12.5

500

12.5

500

1.6

63

1.6

63

6.3

250

6.3

250

6.3

250

0.8

32

0.8

32

3.2

125

3.2

125

3.2

125

0.4

16

0.4

16

1.6

63

1.6

63

1.6

63

0.2

8

0.2

8

0.8

32

0.8

32

0.8

32

0.1

4

0.1

4

0.4

16

0.4

16

0.4

16

0.05

2

0.05

2

HORIZONTAL   MILLING        

VERTICAL    MILLING

TURNING

PLAIN GRINGDING

EXTERNAL GRINDING

       FLAT LAPPING