CORRECTION FACTORS – TURNING
Correction factors for specific type of operation C VcO
M
FF
F
HR
R
x.v
a p
0.5
1.5
2.5
5.0
12.0
I III 0.05 0.08 0.10 0.10 0.15 0.20 0.20 0.30 0.40 0.40 0.60 0.80 0.80 1.00 1.30 II III I II III I II III I II III I II
f
Chip-breakers for fine finishing (FF, FF2…)
1.15 1.00 0.95 0.85 0.80 – – – – – – – – – –
Chip-breakers for finishing (NF, SF..)
– – 1.20 1.05 1.00 1.05 1.00 0.90 – – – – – – –
Chip-breakers for medium machining (FM, M, NM, NMR, SM…)
– – – – – 1.15 1.10 1.00 0.95 0.85 – – – – –
Chip-breakers for roughing (RM, NRM, NR, R…)
– – – – – – – – 1.25 1.10 1.00 0.95 0.65 – –
Chip-breakers for heavy roughing (HR, HR2, NR2, OR…) for 45 min durability
– – – – – – – – – 1.25 1.20 1.15 1.05 1.00 0.95
Correction factors for required durability C VcT
10
15
20
30
45
60
minutes
General machining operations (fine finishing up to roughing) Heavy machining operations (heavy roughing)
1.13
1.00
0.93
0.84
0.76
0.71
–
–
–
1.10
1.00
0.93
Additional correction factors C VcA
C VcA
Machining environment
Condition of the work-material (hard skin due to forging or casting) Internal turning Parting and grooving (radial) Face grooving Interrupted cut Unstable machining conditions Common machining conditions Stable machining conditions
0.70
0.75 0.88 0.80 0.80 0.85 1.00 1.20
Resulting corrected cutting speed vcc
vcc = v c × k vG × C VcO × C VcT × C VcA
– starting speed from catalogue page
v c
k vG – coefficient of used material
76
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