Thank you very much for your valuable feedback. Just to make sure, this would be alright:
-------------------------------------- | SMALLER PCB | -------------------------------------- )¤¤¤( )¤¤¤( )¤¤¤( ---------------------------------------------- | LARGER PCB | ---------------------------------------------- the shorter PCB above the longer one connected by mouse bite tabs? Oh, and since I will be ordering a stencil along with the PCBs, while googling something related to it, I found this: https://learn.adafruit.com/smt-manufacturing/laser-cut-stencils The only thing I find interesting is where they suggest to make modifications to the gerbers in order to shrink the size of the SMD pads: "You'll now see that your pads are thinner. This prevents bridging since the laser is not perfectly precise and tends to 'go over' the boundaries by a few mils." Is it really needed? I have some QFN components with small pitch between pads, I will be ordering the electropolished stencil for added precision. Dana subota, 9. prosinca 2017. u 22:36:39 UTC+1, korisnik Allen Dutra napisao je: > > Hi Luka, > > You are correct. Everyone that I've ever talked to, looks at that mess of > board outlines you've circled and says "Mouse Bite". Ultimately any board > outline is provided to a CNC technician and *interpreted *to create tool > routing. Tool routing that is offset from the board outline by the drill > radius and concave acute angles rounded. Often a good PCB Fabricator (fab > shop) will point out areas that can't be CNC routed and work with the > customer on a solution. > > Take way: board outlines and mouse bites are always interpreted by a > technician to make sure the CNC routing works correctly. I've yet to see > mouse bites done incorrectly though I've have seen the drill size, spacing, > and count adjusted based on board thickness. If your building a thinner > than standard boards a fab shop may adjust the mouse bite specification for > reliability. Translation, make sure the mouse bite doesn't break in the > factory but can be snapped latter by the customer. > > Done correctly you shouldn't need cutting tools to snap mouse bites. > > Allen > > On Sat, Dec 9, 2017 at 5:26 AM, Luka C <[email protected] > <javascript:>> wrote: > >> @Allen I'm planning on assembling them "by hand", manually pick and place >> SMD components and bake them inside a reflow oven. I guess I'll try >> following the Dangerous Prototyping post today. >> The only thing I do not understand is the part I've marked in yellow on >> the picture here: https://i.imgur.com/HmpFPwv.jpg >> Those break tabs contain outlines of both the first and the second board >> as well as the arc. I suppose the technician at the fab house then alters >> this in a way that the machine only cuts the arcs and not the board outline >> directly around it as it would cut the two boards apart? >> >> @gregebert I'm was thinking about cutting them with something like that >> indeed, I'd just like to make it easier by having empty space between them >> and having mousebites to simplify cutting them apart. >> >> Dana subota, 9. prosinca 2017. u 04:17:25 UTC+1, korisnik Allen Dutra >> napisao je: >>> >>> Hi Luka, >>> >>> Allen Dutra, professional PCB designer currently working for Apple and >>> with a lot of first hand experience with PCB panels. >>> >>> In your case you want to use mouse bites to combine two different sized >>> rectangles. V-Scores won't work here. The mouse bite instructions from >>> dangerous prototypes will work well for standard 0.064" designs. Question, >>> are you soldering these boards by hand or having them built on an assembly >>> line? (I could guess your answer but no assumptions from me) Assembly lines >>> will want tooling rails >>> <https://www.pcbuniverse.com/articles/Tooling%20Rails,%20Holes%20and%20Fiducials.png> >>> >>> for best results but these are easily forgotten. >>> >>> I haven't use the PCB Panelizer tool that you linked to. Generally I >>> design my panel in the ECAD tool (Eagle CAD, Allegro, Altium etc.) I'm >>> already using to ensure Gerber accuracy. >>> >>> Let me know if you have other questions, >>> >>> Allen >>> >>> On Friday, December 8, 2017 at 5:07:06 PM UTC-8, Luka C wrote: >>> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "neonixie-l" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/neonixie-l/Y0gwQHuCzoE/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/67036d33-d5a0-465e-8f20-57f96a9acbe2%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/67036d33-d5a0-465e-8f20-57f96a9acbe2%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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