Page 1029 - Tungaloy Catalog

Technical Reference
Milling Tools
Calculation formulas for milling

Cutting speed
Cutting speed (Calculated from number of revolutions)
n SFM: Surface feet per minute
31. 9 %JB
4'. RPM: Revolutions per minute
Dia: DIameter
Number of revolution (Calculated from cutting speed)
ap ae SFM: Surface feet per minute
4'. 9 RPM: Revolutions per minute
31.
v f
%JB Dia: DIameter

Feed speed and feed rate
vf : Table feed (in/min)
fz : Feed rate per tooth (ipt)
z : No. of teeth of the cutter
n : Number of revolutions
Rp
Feed speed is relative speed of cutter and work material and in the
normal milling machine, it is the table speed.
f z (Feed per tooth) In milling, the feed per tooth is very important. The recommended cutting
f f (Feed per revolution) condition is expressed by vc and fz and using the above equation
calculate n and vf and input in the machine.

Cutting time on face milling
T : Cutting time (min)
L : Total table feed length.
(R: Work pieces length (in) + øDc:
Effective cutter diameter (in))
vf : Table feed (in/min)

Depth of cut and cutting width

Depth of cut Technical Reference
Determine by required allowance for machining and capacity of the
machine. In case of TAC mill, there are cutting limits according to
shape and size of the insert. Please see details in section 9 of this
catalog. ap : Depth of cutting (in)

14

Center Cutting width and engagement angle
cutting
v c There is an appropriate engagement angle depending on the cutter
ae diameter, cutting position, work material, etc.use the values in the
øDc table below as a guide.
E
Shoulder Work material Appropriate E Cutter dia. and ae Dc : Cutter diameter (in)
cutting E : Engage angle
0°~ 20° 2
Steel (on small side for a e ≈ Dc
v c 3 ae : Cutting width (in)
ae shoulder cutting)

4
E øDc Cast iron under 40° a e ≈ Dc
5
14–11