We had been using a system with ~600 psi and also had issues with 
     debris left in holes (14.5 - 10).
     Now we are running at ~1000 psi successfully. However, the system also 
     employs the use of ultra-sonics, which in my opinion has more of an 
     affect than the high pressure spray.
     
     Dan Buxton
     Mfg. Engineer    _____                                                
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______________________________ Reply Separator _________________________________
Subject: Deburring
Author:  [log in to unmask] at INTERNET
Date:    04/29/96 7:04 


Can anyone shed some light on the necessary water pressure required 
in the rinse section of a PWB deburring machine to clear drilling 
debris from small vias.  We are drilling 13.5 mil holes and some 10 
mil holes.  Occasionally, we experience some particles of drill  (or 
back-up material) debris left in a few holes.  My calculations show 
that for the nozzle I selected, a 600 psig nozzle pressure results in 
0.068 grams of force in a 13.5 mil hole.  Is that enough?  What does 
it take to get the debris out?  The vendor is offering options for 
600, 1500, & 2000 psig.  The price rises considerably with each 
option.  What do i need?