Hey Steve
is it you ? ; can't see any 'he'he's ; Sam wouldn't give you inferiority
complex,
would he ?
READ THE INSERTS BELOW
> ----------
> From:         Stephen R. Gregory[SMTP:[log in to unmask]]
> Sent:         Friday, 31 July 1998 9:48
> To:   [log in to unmask]
> Subject:      Re: [TN] Glenbrook x-ray??
>
> In a message dated 98-07-30 19:14:35 EDT, you write:
>
>  [log in to unmask] (Paul Klasek)
>  To:    [log in to unmask]
>
>  I concur with David ; have been watching this discussion for some
> time
>  and kept out as I thought perhaps I'm the odd one out in extreme as
>  usual ; but since Dave cracked the pot the way it is :
>  If the process is out of window to such a degree this kind of
> machinery
>  is needed ; I'd say $ much better spend would be in the process gear
> ; not
>  inspection gear . >>
>
> Hey there Paul!
>
> Well since you and Dave started this, I'm gonna jump on the bandwagon
> too. I
> asked the question that I'm about to ask on another web forum a while
> back,
> and the reponses were kind of guarded...(it was like they didn't want
> anybody
> to see them answer with what some may percieve the wrong response).
> But my
> question was; why does it seem that if you want to do BGA, the
> consensus is
> you need to have xray capability?
NO YOU DON'T ; IT IS NOT A CONSENSUS ; ONLY TROUBLE IS FEW OF US ARE
PREPARED TO SPEND TIME ON ANALYSIS OF THE PROCESS(PREVENTION) BEFORE WE
HIT IT .

> I know that xray is a tool that will allow you to see things that you
> normally
> can't see,
IT ACTUALLY ALLOWS YOU TO SEE VERY LITTLE
> but is it REALLY necessary? It would seem to me that if you can
> make sure that you lay enough paste down, put the part where it's
> supposed to
> go, and got your oven cranked-up with enough heat, you're in the BGA
> business...and you can do all that stuff without an xray machine.
YES, VERIFICATION OF PASTE AND BALLS AND PROFILE WILL GET YOU THROUGH

> "But you can't see the solder joints dross-breath, that's why you need
> an xray
> machine.." some may say. But I didn't see everybody getting spooled-up
> about
> having xray when we started putting decoupling capacitors beneath DRAM
> years
> ago...can't see those solder joints either. So, is it really
> necessary?
WELL ; PERSONALLY I THINK THEY DON'T ADDRESS THE ISSUE EVEN TO A LIMITED
EXTEND .
FROM THE COST SIDE THE INTEREST FROM MONEY SPEND WOULD PAY YOU AN
INSPECTOR .
IT IS A DIFFERENT PICTURE IF YOU ACTUALLY HAVE TO SPEND , OR LOOSE IT ON
TAXES .
THAN YOU PLAY DIFFERENT TUNE .

see you Steve                       Paul

> -Steve Gregory-
>
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