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AGIECHARMILLES EDM SURFACE FINISH CROSS REFERENCE CHART

EDM Surface Finish Scale -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 RA

MICRO-METER

RA

MICRO INCHES

RMS 3.90 4.40 4.90 5.50 5.90 6.90 7.90 8.90 9.90 10.80 12.3 13.80 15.80 17.20 19.50 22.00 24.50 27.00 31.30 35.20 39.00 44.40 49.30 54.60 62.40 70.30 78.00 88.20 98.90 109.20 123.90 138.50 153.70 175.50 197.50 218.80 248.60 277.90 306.20

.08 .09 .10 .11 .12 .14 .16 .18 .20 .22 .25 .28 .32 .35 .40 .45 .50 .56 .64 .72 .80 .91 1.01 1.12 1.28 1.44 1.60 1.81 2.03 2.24 2.54 2.84 3.15 3.6 4.05 4.50 5.10 5.70 6.30

3.14 3.54 3.94 4.33 4.72 5.51 6.29 7.09 7.87 8.66 9.84 11.02 12.60 13.78 15.60 17.6 19.60 21.60 25.00 28.10 31.20 35.50 39.40 43.70 49.90 56.20 62.40 70.60 79.10 87.40 99.10 110.80 122.9 140.40 158.00 175.50 198.90 222.30 245.70

Call High Performance Machinery 978-544-6500 for more information

Surface Finishes

Measurement of surface finishes is done with instruments called profilometers. Experience proves that measurement of surface finishes by comparison using a surface finish gauge does not give an error above 2 CH classes. The criteria of roughness are the Ra (Europe) ­ CLA (UK) ­ AA (USA) To obtain a grading of roughness, Charmilles has defined a CH scale, which is however cross referenced with the standards that are in common use.

VDI 3400 AGIE CHARMILLES Ra = CLA = AA class

Definition of Roughness criteria No CH = 20 log (10 Ra) (µm) Some significant rules and figures

1 µm Ra = CH20 10 µm Ra = CH40 If Ra = Ra x 2 CH = CH+6 ex: 1 µm Ra = CH20 2 µm Ra = CH26 3 µm Ra = CH32 The ratio between 2 successive CH units is 1.12 The difference between 2 successive CH units is 12.2%

µm

µ inch

ISO 1302

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

0,10 0,11 0,12 0,14 0,16 0,18 0,20 0,22 0,25 0,28 0,32 0,35 0,40 0,45 0,50 0,56 0,63 0,70 0,80 0,90 1,00 1,12 1,26 1,40 1,62 1,80 2,00 2,20 2,50 2,80 3,20 3,50 4,00 4,50 5,00 5,60 6,30 7,00 8,00 9,00 10,00 11,20 12,60 14,00 16,00 18,00

4,0 4,4 4,8 5,0 6,4 7,2 8,0 8,8 10,0 11,2 12,8 14,0 16,0 18,0 20,0 22,4 25,2 28,0 32,0 36,0 40,0 44,8 50,4 56 63 72 80 88 100 112 125 140 160 180 200 224 250 280 320 360 400 448 500 560 640 760

N3

N4

N5

The MAX Rt: roughly equal to 8 x Ra The mean Rt: is the arithmetic mean of the 5 Max Rt recorded on the 5 sample lengths selected. (For establishing the technology: 0.8mm) Mean Rt = 5 x the Ra value

N6

Note: In surface finish measurements a tolerance of + 2 CH units is accepted. Further note: The American and English standards admit the following relationship between the values V(RMS) and V(Ra): V(RMS) = 1.11 V(Ra)

N7

N8

The French standard NF 05051 is tied in with the ISO 1302 standard concerning classes of surface finish. Call High Performance Machinery for all New and Used Machinery needs: · High Speed Milling · Wire EDM · Sinker EDM · Holepopper EDM Drill · Precision Grinding · Engraving machines · VTL's and HBM's · Saws John Griffiths at: 978-544-6500 or Ken Otzel at: 508-958-5565

N9

N10

Information

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