Page 1022 - Tungaloy Catalog

Technical Reference
Turning Tools
Calculation formulas for turning

Cutting speed When calculating cutting speed from number of revolutions:
SFM: Surface feet per minute
Turning 31. 9 %JB
n 4'. RPM: Revolutions per minute
øDm Dia: Diameter

When calculating required number
Boring
of revolutions from cutting speed:
SFM: Surface feet per minute
n 4'. 9
øDm 31. RPM: Revolutions per minute
%JB Dia: Diameter

Cutting time on external and internal turning
T : Cutting time (min)
External R R R : Cutting length (in)
turning T
(min) f n f : Feed (ipr)
n : RPM

Internal
turning

R

Cutting time on face turning
Vc : Cutting speed (SFM)
T f : Feed (ipr)
(min) T : Cutting Time (min)
Technical Reference

Theoretical surface finish
h : Surface finish (μm)
f
14 f : Feed (ipr)
h (µm) r ε : Nose radius (in)
r ε

Calculation of power consumption (kW) Pc : Power requirement (kW)
F : Cutting force (N)
V c : Cutting speed (SFM)

14–4