Page 275 - Fanar
P. 275
Technical Information i
10.4. Formulas to calculate technological parameters for drilling and tapping
Relationships of peripherial speed andd rotational speed andd tool diameter
Cutting speed Vc [m/min] Cutting force per one tooth F [N]
c
Spindle rotation speed [RPM] Power P [kW]
Feeding speed Vf [mm/min] Key:
d - nominal diameter of tool [mm]
1
when tapping
v - cutting speed [m/min]
c
n - spindle rotation speed [RPM]
when drilling
p - thread pitch [mm]
P - power [kW]
v - feeding speed [m/min]
f
f - feed per revolution [RPM]
Torque when tapping M [Nm] o
d
k - specific resistance of workpiece material [MPa]
c
M - torque when tapping [Nm]
d
Torque when drilling Mc [Nm] z - cutting edges
11
271
