Two options:  
     (1) Ultra-high pressure from a distance
     (2) Lower pressure, higher impingement closer to work surface
     Pumps to accomplish #1 are expensive; #2 involves a little plumbing 
     but is more effective and efficient - hence IBM's development of the 
     'fluid head'.
     Don't worry about line pressure; you need impingement.  Minimize 
     nozzle distance and impact angle (perpendicular to panel surface is 
     ideal).  Spraying Systems Co. 'Flatjet' No. 3504 works well - it 
     passes 0.63 gpm at 100 psi.
     
     J.Felts
     PC World


______________________________ Reply Separator _________________________________
Subject: Deburring
Author:  [log in to unmask] at INET
Date:    4/29/96 9:48 PM


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?