Electronics Forum | Tue Jun 27 11:16:33 EDT 2000 | Christopher Lampron
Hello Bill, Ioan's idea's are good. One more thing that you may want to consider is using a "Home Plate" aperture on your stencil for the aforementioned caps. The idea is to put a smaller amount of solder paste directly underneath the component. This
Electronics Forum | Wed Feb 23 16:38:41 EST 2000 | Michael Parker
I have experienced tombstone with one brand of 0603 capacitor. Swapping in another brand (actually two different brands to date) has stopped the tombstone. I have measured the parts (length, width and height). There does not appear to be any apprecia
Electronics Forum | Mon Jul 20 17:40:48 EDT 1998 | socheat khun
| Does anyone know why this typically occurs. We have seen capacitors crack due to stressing. Any good solutions? | Regards, | | Steve. Hi steve! Did you check component date-code, reflow profile and component placement height. it has happen to me
Electronics Forum | Mon Dec 02 21:32:34 EST 2002 | davef
Sounds like you're killing the poor little critters. Tell us about: * Placement force. * Reflow method. * Where and how you are measuring your reflow recipe. * Cooling rate of the reflow recipe. * How the solder connection to the metalization appear
Electronics Forum | Mon Mar 08 15:37:41 EST 2004 | pdeuel
What type of P&P machine? Useing any Placement force? Ramp speed in reflow? PCB thickness properly defined? Tooling supports too high? Any doubble stacking of parts? Occuring with only one part manufacturer? Start with processes where problem is note
Electronics Forum | Tue Aug 30 17:02:16 EDT 2005 | stepheniii
Check them before the oven for cracks. (after placement) Don't just look at them, take them off the board and check. I"ve seen resisters that were broken by the machine but you couldn't tell untill you took them off. If they are cracked check the co
Electronics Forum | Tue Oct 02 10:30:10 EDT 2012 | eniac
Difference in pick height from paper and embossed reel (typically) is 0.2 mm. Try to change your pick height and place height (different type of capacitors have a different height: for 100 nF 0603 and for 4.7 uF 0603 it's a big difference!). Can you
Electronics Forum | Sun May 26 02:06:39 EDT 2019 | jlawson
Placement force can cause chip cracking-micro cracks also. As machines are getting faster they tend to not control force other than spring pressures and z displacements. There are some machines that have full closed loop place pressure control , but
Electronics Forum | Tue Nov 03 03:29:20 EST 2020 | astarotf
Hello everyone. I would like to know opinions about which is the best SMT machine (pick and place) on the market, for smd electronic manufacturing, to put 0201 chip-type components up to large packages, such as coils, capacitors, soic16-, QFN, BGA et
Electronics Forum | Tue Aug 24 15:15:43 EDT 1999 | John Thorup
| Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? | | Any help would be appreciated. Thanks. | Most common reason is uneven heating where one side of the component ach
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