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Charmille Surface Finish Chart

 

Q. Is there a chart showing the difference between Charmilles surface finish and that of RMS or SPI or any other? Thanks! Hope to here from someone.

Gale Tdeleted
Omaha, Nebraska


++++++

Q. I would like to know the VDI equivalent for a (Ford) stipple 002 texture. We prefer to EDM our texture using a Charmilles sinker EDM. Can anyone help please? Thanks,

Kal Bdeleted
- Reading, Massachusetts


October 8, 2012

Q. Hello Kal,
Did you get an answer to the Ford 002 Stipple question? We have a customer asking for us to mold a part with this finish and we also have a Charmille sinker that I need a conversion to a Charmille finish for. If you have any info I would appreciate it. Thanks,

Vincent Giglio
- Toms River, New Jersey USA



Q. I am trying to get a surface finish comparison chart from a Charmille EDM finish to an Ra. If anyone can lead me in the right direction, I would appreciate the help.

Hank Walton
- Lafayette, Louisiana



A. How nice of Charmilles to have their own surface finish standard...
Look at their "technology sheets"; which list different material types, thickness of material, wire type, amperage, etc. If yours are the same as mine they have a translation of at least a few of their numbers. XS25A.TEC lists:

CH 29 = 112 Ra
CH 27 = 88 Ra
CH 25 = 72 Ra
CH 21 = 44.8 Ra
CH 15 = 22.4 Ra.

Or you may try contacting Charmilles...

John Muldowney
- Hamel, Minnesota


July 2, 2009

A. If the Ra value in the above list is in µin then the Charmille number is the same as the VDI number.
That's good to know. Thanks for the info.

VDI

Ra(µm)

Rz(µm)

Ra(µin)

ISO 1302

Rt (µm)

0

0,10

4

N3

1

0,11

4.4

2

0,12

4.8

3

0,14

5.6

4

0,16

6.4

5

0,18

7.2

N4

6

0,20

8

7

0,22

8.8

8

0,25

10

9

0,28

11.2

10

0,32

12.8

11

0,35

14

N5

12

0,40

1,5

16

1,6

13

0,45

18

14

0,50

20

15

0,56

2,4

22.4

3,2

16

0,63

25.2

17

0,70

28

18

0,80

3,3

32

N6

5,0

19

0,90

36

20

1,00

40

21

1,12

4,7

44.8

7,5

22

1,26

50.4

23

1,40

56

24

1,62

6,5

63

12,0

25

1,8

72

N7

26

2,0

80

27

2,24

10,5

88

16,0

28

2,5

100

29

2,8

112

30

3,15

12,5

125

N8

20,0

31

3,5

140

32

4,0

160

33

4,5

17,5

180

25,0

34

5,0

200

35

5,6

224

36

6,3

24,0

250

N9

37,0

37

7,0

280

38

8,0

320

39

9,0

34,0

360

46,0

40

10,0

400

41

11,2

448

42

12,6

48,0

500

N10

60,0

43

14,0

560

44

16,0

640

45

18,0

69,0

760

85,0

John McSwiggen
- Ramsey, Minnesota


October 22, 2009

A. You can download an EDM surface finish chart at:
highperformancemachinery.com/yahoo_site_admin/assets/docs/Surface_Finish_Charts.270113339.pdf

john griffiths
- Orange, Massachusetts

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