This post caught my eye because it's implied that "around 400 to 600ppm" is 
considered a good solder defect rate coming directly off a wave solder machine.

I would like to know how others feel about this. What do you consider an 
acceptably "good" wave solder defect rate (before any touch-up, of course!) on 
mixed technology boards? With what minimum lead pitch?

I have read benchmarking studies which say that there are people out there 
getting very close to ZERO ppm.... if so, someone out there ought to have direct 
knowledge of this!


On Mon, 16 Jun 1997 11:28:57 -0700 Ron Hollandsworth wrote:

> From: Ron Hollandsworth <[log in to unmask]>
> Date: Mon, 16 Jun 1997 11:28:57 -0700
> Subject: Re: Hot Air Knife after solder pot?? Anyone use this?
> To: [log in to unmask]
> 
> 
>      Hi ED:
>      I have some experience with Hollis GBS machines with Hot Air Knives.  
>      The machines are good.  Let me say that right out of the gate.  The 
>      Hot Air Knife will work as well as you make it work.  I have used the 
>      HAKs and have redesigned the internal parts to the HAK for a more even 
>      air flow (Three have been redesigned).  Back in "93" we bought a used 
>      GBS machine and completely rebuilt the machine incorporating a 
>      separate control console using PID controllers, Hollis' high mass 
>      preheat system, with a chip wave, and the redesigned HAK.  This 
>      machine was built as a backup to Hollis One our main machine.  Hollis 
>      one was a GBS machine controlled by a GE FANUC computer.  Both 
>      machines One and Two could produce product of mixed technology (SMT & 
>      PTH).  Setup for the machine to operate well, around 400 to 600 PPM, 
>      takes experience in wave setup (solder pot).  Both machines were 
>      equipped with wave fluxers and conveyors that incorporate finger 
>      styles so fixtures could be used to process product.
>      
>      We are getting rid of the machines for a new Dover Soltec Delta 
>      System.  I worked and built those Hollis's machines.  We made a lot of 
>      changes so the machines would do what we wanted them to do quality 
>      wise with our product.  We are high mix semi-high volumn.
>      
>      If you have more questions I can be reached at:
>      
>      
>      [log in to unmask]   (home)
>      [log in to unmask]   (WORK)
>      
>      My name is Ron Hollandsworth, I am a IR&D Operations Task Leader for 
>      ITT Aerospace/Communication Division.
> 
> 
> ______________________________ Reply Separator 
_________________________________
> Subject: Hot Air Knife  after solder pot?? Anyone use this?
> Author:  <[log in to unmask]> at INTERNET
> Date:    6/16/97 12:23 PM
> 
> 
> Hi there Technetters!
>      
> Hollis used to make a machine called the GBS that utilized a hot 
> airknife after the solder pot. I believe they have a patent on it, 
> however, they were bought by Cookson (Electrovert) a few years ago and 
> might not be enforcing it nor building it.
>      
> The customers I've had contact with are split 50-50 (approx) as to it's 
> usefulness. It does a fine job debridging, however the parameters 
> (temp, angle, force, distance) are somewhat critical. There is a 
> significant drawback as well: If an assembly which would normally have 
> "a few" blowholes visible were to be processed using the hot air knife, 
> ALL blowholes (a majority of the holes on that assy) would be exposed. 
> Some people believe in touching up blowholes and this makes the process 
> counter productive. Those who feel blowholes are a fatal defect are 
> delighted at the revelation... I guess it's a matter of philosophy?
>      
> To Tony: (originator of the topic)
>      
> I'd lost your email addy in an unfortunate digital-snafu... I'd like to 
> discuss this further with you, including developing retrofits for your 
> equipment. Please contact me directly at this addy or by phone, if you 
> are interested.
>      
> Regards,
>      
> Ed Popielarski
> QTA Machine
> 714-364-6614
>      
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