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 _____ /____/\ _______|___ \/| /________ /_| |< Continental Circuits Corp. / ______||_ </| 3502 E.Roeser Rd. | / | /___| |/ Phoenix, AZ 85040 | | |___|_____/ Voice(602) 232-9133 Fax(602) 268-7386 | \/_____ /| E-Mail [log in to unmask] \_________|/ ______________________________ 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?