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July 2001

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Subject:
From:
"Rougeux, Scott" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 11 Jul 2001 14:17:10 -0500
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Hello.........

Just a couple of questions: (anyone)

What is the width of your Optimizer?
What is the width of your wave solder machine?
How often is your Optimizer pallet cleaned?
How do you clean it?
Does anyone besides yourself perform the measurement runs?

> -----Original Message-----
> From: Alan Kreplick [SMTP:[log in to unmask]]
> Sent: Wednesday, July 11, 2001 1:44 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] WaveRider results on solder wave
> 
> Julien,
> I've been monitoring the wave using the Wave Solder Optimizer (very
> similar
> to the WaveRider).
> I monitor (once per shift) immersion depth, parallelism, dwell time,
> conveyor speed, and preheat using individual measurements SPC charts.
> For immersion depth, my target is .048", with UCL at .060" and LCL at
> .036"
> (the Optimizer measures in .012" increments, so I allow for one increment
> variation).
> For the rest of the process parameters, the control limits (three std.
> dev.) are set by historical data (fifty readings).  Here are the other
> control limits: parallelism and dwell time +/- .3  seconds, speed +/- .2
> ft/min, and preheat +/- 5 degrees F.
> Also, I have one 18" section on fingers that I run the Optimizer on in
> lieu
> of placing the unit on any part of the conveyor.  This eliminates the
> conveyor fingers as the cause for out of control conditions in the depth,
> length, or parallelism.  My rational is that I'm trying to monitor the
> wave
> solder pot, not the conveyor fingers (yeah, I know that my boards run on
> all of the conveyor, but it's easier to monitor the solder pot without the
> conveyor finger "noise" factor).
> 
> 
> 
> Good luck
> 
> 
> Al Kreplick
> Teradyne, Inc
> 500 Riverpark Drive
> North Reading, MA 01864
> 978-370-1726
> 
> 
>                                                                   
>  (Embedded                                                        
>  image moved   TechNet <[log in to unmask]>                          
>  to file:      07/11/2001 11:19 AM                                
>  pic28689.pcx)                                                    
>                                                                   
> 
> 
> 
> Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please
> respond
>       to Julien Bouchard <[log in to unmask]>
> 
> To:   [log in to unmask]
> cc:
> Subject:  [TN] WaveRider results on solder wave
> 
> 
> Hi everybody,
>         We start using a waverider for monitoring two wave soldering
> machine. We
> have made some pretest run during one month. Our main concern is about the
> parallelism and the immersion depth of the solder. The parallelism is
> between -0.2 sec et 0.4 sec ( main wave ) and the immersion depth is
> between
> 1.47 mm and 1.93 mm. Our main question is about the variation we see not
> the
> absolute value. We have a standards deviation of 0.2 sec for the
> parallelism
> and 0.12 mm for the immersion depth. Since we have no real point of
> comparaison, we are unable to say if this it's ok or too much.  We want to
> know if other person use the waverider and which variation do you read
> from
> the immersion depth and the parallism of the wave solder. Thank you.
> 
> 
> Julien Bouchard ing. stag.
> Matrox - Spécialiste de procédés
> 
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