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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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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 T [last name deleted for privacy by Editor]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 B [last name deleted for privacy by Editor]- Reading, Massachusetts
2006
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,
- Toms River, New Jersey USA
October 8, 2012
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 |
- Ramsey, Minnesota
A. You can download an EDM surface finish chart at:
highperformancemachinery.com/yahoo_site_admin/assets/docs/Surface_Finish_Charts.270113339.pdf
- Orange, Massachusetts
October 22, 2009
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