
148 Fundamentals of Machining Processes
where h is the chip thickness to be removed by each cutting edge:
z
For a cutting edge angle χ, the chip area A
c
is
cz
where b is the undeformed chip length that is equal to the length of the active
part of the cutting edge:
b
==
sin
χ
χ
o
2
where
t is the depth of cut
d
o
is the diameter of the predrilled hole
t
=
o
Generally t = 0.005 d + 0.1 mm.
The depth of cut t in nish reaming is taken, according to Table 5.8, from
0.05 to 0.25 mm depending on the reamer diameter.
5.4.3 Forces, Torque, and Power in Reaming
Force, torque, and power in reaming can be calculated as in the case of drill