I had ours after reflow for about a year. We decided that this was not
the best spot for our machines and moved them behind our PnP machines.
Like Richard said, you need it where ever you feel you need the
monitoring.
As far as evaluation goes, speed (both in programming and actual
running) of the machine was a issue to us. Number of false calls and
being able to have a central library were a couple of other issues.
Good Luck
Larry Koens
E.I. Microcircuits
Mankato, MN
-----Original Message-----
From: Richard Hamilton [mailto:[log in to unmask]]
Sent: Thursday, August 30, 2001 8:08 PM
To: [log in to unmask]
Subject: Re: [TN] AOI equipment
Praveen,
Good question. From my viewpoint it depends on the targeted results of
AOI.
In a past life we did post paste as well as post reflow. Of course the
theory of getting information earlier in the process being the best
course
of action can only be advisory when you ask either one or the other.
With what you have asked here, I would prefer the post reflow. My
thinking
is that you seem to already be OK with the paste process, and if you
have
the placement process pretty well nailed down the the latter of the two
locations would be a better bet because it allows you to validate a good
total process. Whereas if it is before reflow you don't get a good
'picture' of what is happening in reflow. Now if you put it post reflow
and
find a lot of problems, then you could always move it to pre reflow to
help
determine the real cause.
Of course the opposite is true also in that if you place it pre reflow
and
don't see problems but there seems to be problems later in the process,
then post reflow might help a bit.
Probably the best action is to decide on one place and see what you get.
Personally, if the paste printing, placement and any other process prior
to
reflow seem to be in check, I would prefer to look at the finished
product.
Good luck.
Richard Hamilton
At 12:18 AM 8/31/01 +0000, you wrote:
>Hi everyone,
>I just wanted to know where would it be preferable to postion an AOI
>equipment on a production line. I have known of people who prefer to
use it
>before reflow and some who have suggested after reflow.
>What would the implications be if this equipment is placed prior to and
>after reflow?
>Also, if one had to evaluate an AOI equipment (not solder paste
measuring
>equipments), then what factors would one have to consider to gage the
>capability of this equipment?
>Thanks
>Praveen
>
>
>
>__________
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