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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