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What you need to know before buying your AOI solution
Cycle Time Less Equipment Lower Escapes Less Component Less WIP
Reduction Scrap and Costs
Reducing false call Verification time
10:1 reduced equip- Reduction in errors Reduction in the You will see a 10:1
rates by a factor of 10 reduced by a ratio
ment requirement made by operators. errors made by the decrease of WIP in
of 10:1
for verification operators. the repair loop.
Increased qual-
ity into your next In many cases, we
process. have seen a greater
than 5% reduction
in repairs.
Figure 3. The benefits of low false-call rates.
parative systems may be adequate. If you process monitoring and SPC are well realistic versus how you will be using the
are looking at understanding the process known, and if these techniques are to be system in your manufacturing process.
and correcting issues, access to parametric implemented in your process, the ability of It’s important to look at programming
measurement data will allow for complete the AOI system to measure placement and (initial programming) and program
process control. solder amounts will again increase the value support (program debug on new batches of
Figure 4 shows a simple example of a of the AOI system. products) times for the overall usage of the
placement head going out of calibration. system and try not focus on the first demo
The top part of the graph shows the 3. programming time program.
measurement information from a rules- How fast is fast enough? This is a question When using a template/comparative-
based AOI system and the control limits the user of the AOI system will have to an- based system ask the questions:
for the process. The lower part of the chart swer, but there are two factors to consider:
• Is the program inspecting all defect
shows the attribute data from a non- first program development time and ongo-
types including solder?
measurement based AOI platform. The ing program support.
• What is the false call rate or on-
measurement system can provide data in When having a demo of an AOI
going program debug required for
real time that can highlight the components system, most companies will have a
the next batch of boards?
placement going out of control far before program running in one to two hours, or
• How will this affect fault coverage?
a pass fail limit is met. The benefits of even less. However, check to see of this is
When looking at rules-based systems
• Is the system library-based—if so,
how much does the use of the
library decrease programming times
over the lifespan of the AOI system?
• If we use rules-based systems, false
fails will be lower and will require
less program support over time.
4. stability, support and MTBF
Will the AOI company be there to support
you? Where does the company have sup-
port staff? Has the system been designed to
provide high mean time between failures
(MTBF) and reliability?
We have seen the exit of multiple major
players from the AOI market that many
would have described as stable entities—
businesses that were but one arm of larger
corporations. Some have left multiple
times, returning under new ownership.
These events have left many customers with
unsupported products, no path forward,
and little value left in their investment.
There are a few companies, however,
whose sole business is AOI. Success in
this industry directly affects the success of
their entire business. These companies are
generally focused on providing best-in-class
solutions and supporting their customers.
Figure 4. The benefits of parametric data from a rules-based AOI system.
Applications and hardware support
12 – Global SMT & Packaging – October 2009
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