Electronics Forum | Tue Nov 01 12:28:36 EDT 2016 | comatose
It depends. Are you hand breaking them, rotary knife or linear knife? Hand break you want to be about 5mm (and it isn't a great practice even then) with a rotart knife you want to keep parts probably 3mm, especially capacitors. With a linear knife we
Electronics Forum | Thu Aug 31 04:25:03 EDT 2000 | Chris May
Dougie, If you have square, rectangular etc; shaped PCB's maybe you could have routing between circuits. "V" shaped grooves top and bottom. I found this extremely good especially if the assemblies are wave soldered. No gaps for flowing up and over.
Electronics Forum | Mon Apr 03 09:25:59 EDT 2017 | Rob
Use a router with fiducial correction? in reality if you are putting a PCB in a plastic enclosure then the injection moulding is going to have far greater tolerances than a laser or router depanelised PCB is. Also, if our laser markers are anything
Electronics Forum | Fri May 15 19:20:47 EDT 2009 | jlawson
if you have a budget for new machine, laser depanelising is pretty good for flex PCB as no physical stress on PCB like mechanical routing, thus fixturing is easier and less prone to moving the flex while cutting. Laser systens can also cut FR4 standa
Electronics Forum | Wed Mar 26 16:12:46 EDT 2008 | jlawson
If you have jobs where you can not, there is a company in Japan that makes the best v-groove depanelers called TST, 'guru's in v-groove depanelising'. Their systems can be supplied to reduce stress on cutting to near zero compared to CAB and other lo
Electronics Forum | Thu Jan 07 14:19:07 EST 2016 | hegemon
What SWAG said. We use a PCB Router exclusively for rigid flex assemblies. On a side note, we have begun to save fixturing costs by using 3D print technology to produce many of the fixtures, for both rigid and rigid flex. We can design and print l
Electronics Forum | Fri Apr 18 16:53:25 EDT 2003 | takfire
DST, What was the crack signature? Was the crack parallel with the internal electrodes or 45� with the terminal electrode? It is also important to determine the orientation of the failed caps on the PCB (in regards to depaneling). Perhaps the cap
Electronics Forum | Wed May 25 21:03:30 EDT 2011 | thanhnguyen22
Hi All, I am new the PCBA process fabrication. I have found many cracks in the PCB after we have cross sections analysis. The cracking has same kind of pattern. It happens betwen the solder and the PCB, or between the solder and the part, BUT not be
Electronics Forum | Wed Sep 27 12:44:52 EDT 2000 | Ashok Dhawan
What could be possible resons for " Plating Crack on Barrel (tented via)" This tented via is in proximity to parts being hand soldered. The crack in barrel was detected on failure analysis - micro-section of via where barrel is having crack ( circul
Electronics Forum | Thu Oct 21 15:33:56 EDT 2004 | Indy
I have seens cracks from AVX capacitors too. The thing is they already have micro cracks that are not visible to naked eye. When the capacitor is stressed the crack expands. One way of mitigating this is by tweeking your process. See how your singula
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