Electronics Forum | Tue Feb 16 12:44:05 EST 2010 | esoderberg
95%+ of my boards are small and therefore are panelized using the V-score technique. Getting a lot of resistor cracking even though the resistor is layed out to be perpendicular to the long board edge. What dimension should be used from the board e
Electronics Forum | Wed Nov 13 15:00:57 EST 2019 | stephendo
I have seen resistors cracked during placement. The part was programmed incorrectly and the nozzle pushed down on the part too hard. I do not remember seeing any cracked during depanelization. Nibblers can cause damage if they are on the bottom and
Electronics Forum | Thu Nov 14 21:53:04 EST 2019 | sssamw
I've seen crack on resistor also.The crack on ICs mainly is on the solder joint due to very high strain.
Electronics Forum | Thu Mar 02 13:20:26 EST 2006 | inds
jagman, take a hard look at a capacitor under the high mag microscope before you start assembling it.. I remembering seeing cracks even before the assembly. apparently all chip capacitors have crack at the intersection between the capacitor head and
Electronics Forum | Fri Jul 12 22:15:56 EDT 2013 | ericrr
Sorry to build up your hopes. The latest thing to hit the air ways at work, I was accessed of fiddling with the oven settings, because there were reports of "cracked joints" there was no mention of where the cracks were, cracked at the pcb or cracke
Electronics Forum | Wed Jun 23 08:47:32 EDT 2010 | mun4o
Hi, about location - components are in the diferent location on PCB.In the one PCB have 7 cap 560pF 0603 , and some of thenm are cracked, another are OK. When I look at 20x microscope , I can't see defect, but ICT measure from 200 to 350pf.When hea
Electronics Forum | Tue Feb 23 09:48:26 EST 2010 | dyoungquist
How are you sepatating your boards out of the panel? If you are flexing them to break the V-score, this could be what is causing the resistors to crack.
Electronics Forum | Tue Feb 23 11:05:46 EST 2010 | kjs123p
We had this same problem several years ago. The caps and resistors were cracking when we snapped the boards apart. We now use a pizza cutter style depanelizer. A couple of manufacturers that I know of are CAB and Fancort. I hope this helps.
Electronics Forum | Tue Aug 30 09:49:24 EDT 2011 | blnorman
Guess the better question is why are the resistors and FETs heating to the degree that they discolored the coating? If the coating is discolored, I'd be concerned with the possibility of cracking as dave mentioned. Cracks defeat the purpose of the
Electronics Forum | Wed Nov 13 02:28:27 EST 2019 | trino
Hello, I am a Japanese engineer. I am sorry for my unskillful English. Have you ever encountered cracks in chip resistors or IC components due to board mechanical stress? Especially, I'm looking for a case in the PCBs Depaneling process(pizza cutte
