Общий каталог Tungaloy 2020 - 2021 - страница 1618

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Calculation formulas for turning

Cutting speed When calculating cutting speed from number of revolutions:

External π × øD × n V : Cutting speed (m/min)

V = c

turning c n : Number of revolution (min-1)

n 1000 øD : Diameter of workpiece (mm) π 5 3.14 Example : Calculating the cutting

When calculating required number Internal speed when turning a ø150 mmof revolutions from cutting speed:

turning V × diameter workpiece at 250 min-1

nn =c 1000
V3.14 × 150 × 250
π ×øDc == 117 m/min

1000

Cutting time on external and internal turning

R T : Cutting time (min)

External R T R : Cutting length (mm)

turning f n (min) f : Feed (mm/rev) n : Number of revolution (min-1)

Internal turning

R

Cutting time on face turning

V: Cutting speed (m/min)
øa 2−øb2c
Tf : Feed (mm/rev)
(min)T : Cutting Time (min)

Theoretical surface roughness

h : Surface roughness (µm) f f : Feed (mm/rev)

(μm) x r r : Nose radius (mm) RE

〔 〕The notation in the brackets is the one RE used in the catalog (ISO compliant)

Calculation of power consumption (kW) Pc : Power requirement (kW)

F x Vc F Cutting force (N)

V : Cutting speed (m/min)