Principles of Cycle Time
Reduction
Copyright 2000
1
2
There are two common definitions:
The interval that passes from a given event in
one cycle to the same event in the next cycle
Cycle
Start
Cycle
Start
3
There are two common definitions:
The interval that passes from a given event in
one cycle to the same event in the next cycle
But this definition is too simplistic…
…it doesn’t take into account events that do
not happen in every cycle
If you have a two minute button-to-button
time and 1,000 parts to run…
…would you complete the production
run in 2,000 minutes?
4
There are two common definitions:
The interval that passes from a given event in
one cycle to the same event in the next cycle
Tool Maintenance
5
There are two common definitions:
The interval that passes from a given event in
one cycle to the same event in the next cycle
Bar Loading
6
There are two common definitions:
The interval that passes from a given event in
one cycle to the same event in the next cycle
Sampling Inspections
1
2
7
8
13
14
3
4
5
6
9
10
11
12
15
16
17
18
7
There are two common definitions:
The interval that passes from a given event in
one cycle to the same event in the next cycle
Personal Time
8
There are two common definitions:
The interval that passes from a given event in
one cycle to the same event in the next cycle
Machine Down Time
Production
9
There are two common definitions:
A more realistic definition…
The overall length of time required to complete
a production run divided by the number of
good workpieces produced
We’ll also call this “through-put time”
10
There are two common definitions:
A more realistic definition…
The overall length of time required to complete
a production run divided by the number of
good workpieces produced
Admittedly, calculating cycle time is more
difficult…
…but there is much greater potential to reduce
cycle time!
11
There are two common definitions:
A more realistic definition…
The overall length of time required to complete
a production run divided by the number of
good workpieces produced
Anything that adds to the length of time it
takes to complete a production run will be fair
game for your cycle time reduction program!
12
There are two common definitions:
By the way…
An important comparison
Button to button time:
2 minutes
Compare to:
Throughput time: 3 min, 45 sec
13