Information Technology Reference
In-Depth Information
Lathe
CNC
SPM
Production data
Parts required per year (
D
)
1,500,000
1,500,000
1,500,000
Production cycle (
t
)
5 years
5 years
5 years
Interest rate (
r
)
6%
6%
6%
Max. working hours
per year (
H
)
3,600
3,600
3,600
Machine tool data
Parts per hour (
p
)
72
238.10
529.41
Machine availability (
a
)
90%
95%
90%
Effective parts per hour (
E
)
E
=
p
a
64.8
226.2
476.47
Working hours per year (
h
)
h
=
D
/
E
23148.15
6,637.17
3,148.15
Machines required (
M
)
M
=
h
/
H
6.43 => 7
1.84 => 2
0.87 => 1
Wage costs
Wage rate (
w
)
$45/h
$45/h
$45/h
Machinists required (
R
)
7
2
1
Wage per hour (
W
)
W
=
w
R
$315
$90
$45
Wage cost per part (
C
w
)
C
w
=
W
/
E
$4.4811
$0.3979
$0.0944
Cutting tool consumption
Tool cost per process (
T
)
$0.0168
$0.0168
$0.0168
Number of processes
per part (
n
)
3
3
3
Cutting tool cost per part (
C
t
)
C
t
=
n
T
$0.0504
$0.0504
$0.0504
Electricity consumption costs
Electricity cost per kWh (
k
)
$0.15
$0.15
$0.15
Machine electricity
consumption (
e
)
9 kW
11 kW
36 kW
Total consumption (
d
)
63 kW
22 kW
36 kW
d
=
e
R
Electricity cost per h (
c
)
c
=
k
d
$9.45
$3.30
$5.40
Electricity cost per part (
C
e
)
C
e
=
c
/
E
$0.1456
$0.0146
$0.0113
Machine depreciation costs
Machine investment cost
per unit (
u
)
$35,900
$124,800
$264,678
Total machine investment
cost (
U
)
U
=
M
u
$251,300
$249,600
$264,678
Machine depreciation
cost
per year (
f
)
f
=
U
/
t
$50,260
$49,920
$52,935.60
Depreciation cost/part (
C
m
)
C
m
=
f
/
D
$0.0335
$0.0333
$0.0353
