Mirage MM305i Operation & Maintenance Manual page 38

Table 1 (Use FPT number in feed rate calculation to obtain cutting edge constant C)
Feed in C
0.002 1.40
0.004 1.25
0.006 1.15
0.008 1.08
0.010 1.04
0.012 1.00
0.014 0.97
0.016 0.94
Table 2 (Determine the type of operation to obtain constant W)
Type of operation
Turning – finishing cuts
Turning – roughing cuts
Milling – finishing cuts
Milling – Heavy metal removal face milling
Drilling – normal to hard to drill materials
Table 3 (Determine material to obtain constant PC )
Material Type
Plain carbon steels
Free machining and stainless
steels
Alloy steels
High alloy steels and
castings
Aluminium
Cast iron
Stainless steel
Heat resistant super alloys
Mirage Machines Ltd ∙ 8-10 Enterprise Way ∙ Derby ∙ DE21 4BB ∙ UK ∙ t: +44 (0)1332 291767
f: +44 (0)1332 370356 ∙ sales@miragemachines.com ∙ www.miragemachines.com
Feed in C
0.018 0.94
0.020 0.90
0.025 0.86
0.030 0.83
0.035 0.80
0.040 0.78
0.050 0.75
0.060 0.72
Hardness -
HB
<200
< 260
< 340
< 450
< 300
< 340
Doc: MML265 Issue: 004
Feed C Feed
mm mm
0.02 1.40 0.45
0.10 1.25 0.50
0.15 1.15 0.60
0.20 1.08 0.75
0.25 1.04 0.90
0.30 1.00 1.00
0.35 0.97 1.25
0.40 0.94 1.50
Tensile PC
Strength – (inch)
n/mm²
< 700 0.51 –
0.62
< 850 0.74 –
0.92
< 1200 0.80 –
1.00
< 1500 1.00 -
1.20
< 300 0.25 –
0.33
0.63 –
0.86
< 1200 0.80 –
1.00
< 1250 1.00 –
1.10
Issue Date: 13.06.2013
C
0.94
0.90
0.86
0.83
0.80
0.78
0.75
0.72
W
1.00 – 1.10
1.60 – 2.0
1.10 – 1.25
1.30 – 1.60
1.30 – 1.50
PC
(metric)
1.39 – 1.69
2.02 – 2.51
2.18 – 2.73
2.73 – 3.28
0.68 – 0.90
1.72 – 2.35
2.02 – 2.51
2.73 – 3.00
Page 38 of 39