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| From: | "John Luciani (jluciani AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> |
| Date: | Sat, 1 Apr 2017 13:12:30 -0400 |
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| Subject: | Re: [geda-user] No support for solder paste in pcb file format ? |
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--f403045f74b807bddb054c1e08dd Content-Type: text/plain; charset=UTF-8 On Fri, Mar 31, 2017 at 10:40 AM, Nicklas Karlsson ( nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] < geda-user AT delorie DOT com> wrote: > I used other software before and there it was possible to draw in paste > layer but I also heard files where modified before production. It is more a > question about if paste layer is bettery generated from a template like > clearance is around objects or by manually adding objects to the layer? > I would not manually add any objects. When you run a command or script to generate a paste layer (or export a stencil) I would look at each footprint. If the footprint has an sfp file use it. If not then automatically generate a pattern with a set of rules. John L > > 2017-03-31 1:50 GMT+02:00 John Luciani (jluciani AT gmail DOT com) [via > geda-user AT delorie DOT com] <geda-user AT delorie DOT com>: > >> >> >> On Thu, Mar 30, 2017 at 12:26 PM, Nicklas Karlsson ( >> nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] < >> geda-user AT delorie DOT com> wrote: >> >>> > > > > >> John Luciani: >>> > > > > >> > I create stencil footprints with the same basename as >>> > > > > >> > the component footprint and a ".sfp" extension. I have >>> > > > > >> > a script that parses the pcb and identifies all components >>> > > > > >> > that have a stencil footprint. >>> > > > > >>> > > > > I couldn't find this script on your page. Could you please post >>> or >>> > > link? >>> > > > > >>> > > > >>> > > > The script isn't quite ready for prime-time. >>> > > >>> > > But you tell why these scipts are good? >>> > > >>> > > >>> > The current script identifies the footprints that should be changed >>> when >>> > generating gerbers for a stencil. The completed script will perform the >>> > replacement. >>> >>> To put it another way. Is it better to generate paste layer from a >>> script than manually editing each footprint? >>> >> >> I do not manually edit anything. If a part requires a stencil footprint it >> is generated with a script along with the footprint. >> >> For the other parts I do not bother. Future versions of the script will >> accommodate parts >> without sfp files by generating slightly reduced stencil openings for >> each pad. >> >> >>> >>> > > > > >> as thin line silk for checking or write the pads to the sfp >>> file. >>> > > > > >> >>> > > > > >> Do you have any specific file format for your sfp files ? >>> > > > > >> >>> > > > > > >>> > > > > > I just make them as normal footprints. For example - the >>> stencil >>> > > > > footprint >>> > > > > > below is for a Cree XP-G LED -- >>> > > > > > >>> > > > > > Element[0x0 "LED" "" "" 0 0 9996 2996 0 100 0x0] >>> > > > > > ( >>> > > > > > Pad[-5511 -5511 -5511 5511 1968 2000 2968 "" "1" 0x0100] >>> > > > > > Pad[5511 -5511 5511 5511 1968 2000 2968 "" "2" 0x0100] >>> > > > > > Pad[-492 -3937 492 -3937 2952 2000 3952 "" "3" 0x0100] >>> > > > > > Pad[-492 0 492 0 2952 2000 3952 "" "3" 0x0100] >>> > > > > > Pad[-492 3937 492 3937 2952 2000 3952 "" "3" 0x0100] >>> > > > > > ElementLine[7996 -2484 7996 -7996 1000] >>> > > > > > ElementLine[7996 -7996 -7996 -7996 1000] >>> > > > > > ElementLine[-7996 -7996 -7996 -2484 1000] >>> > > > > > ElementLine[7996 2484 7996 7996 1000] >>> > > > > > ElementLine[7996 7996 -7996 7996 1000] >>> > > > > > ElementLine[-7996 7996 -7996 2484 1000] >>> > > > > > ElementArc[-7996 -10496 500 500 0 360 1000] >>> > > > > > ) >>> > > >>> > > The *.sfp files are used to define shapes for solder paste? >>> > > >>> > >>> > The shapes define openings in a stencil. >>> >>> Then the shapes end up on the "stencil" layer, I think "paste" layer is >>> a common name for this layer. >>> >>> >>> > > > For thermal pads I always use the grid. I have seen a lot of >>> production >>> > > > problems. Bridging and misalignments. On these large pads I use a >>> grid >>> > > > which reduces the coverage to between 50 - 60%. >>> > > >>> > > You use a grid because there will be production problems for a solid >>> shape? >>> > > >>> > >>> > Yes. I have seen bridging and misalignments. All of the components that >>> > I have used (with thermal pads) have recommended stencil openings >>> > as well as footprints. I either follow the datasheet recommendation or >>> > the manufacturer application notes. >>> >>> I do not perfectly understand this, do you have an example for example >>> datasheet or application note? >>> >> >> >> The datasheet for the Cree XPG is at >> >> www.cree.com/led-components/media/documents/XLampXPG-15B.pdf >> >> Near the end of the file are the footprint and stencil >> recommendations. >> >> >> >>> >>> >>> Regards Nicklas Karlsson >>> >> >> >> >> -- >> http://www.wiblocks.com >> > > -- http://www.wiblocks.com --f403045f74b807bddb054c1e08dd Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">= On Fri, Mar 31, 2017 at 10:40 AM, Nicklas Karlsson (<a href=3D"mailto:nickl= as DOT karlsson17 AT gmail DOT com">nicklas DOT karlsson17 AT gmail DOT com</a>) [via <a href=3D"= mailto:geda-user AT delorie DOT com">geda-user AT delorie DOT com</a>] <span dir=3D"ltr">= <<a href=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank">geda-user AT de= lorie.com</a>></span> wrote:<br><blockquote class=3D"gmail_quote" style= =3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir= =3D"ltr">I used other software before and there it was possible to draw in = paste layer but I also heard files where modified before production. It is = more a question about if paste layer is bettery generated from a template l= ike clearance is around objects or by manually adding objects to the layer?= </div></blockquote><div><br></div><div>I would not manually add any objects= .<br><br></div><div>When you run a command or script to generate a paste la= yer (or export a stencil) I would<br></div><div>look at each footprint. If = the footprint has an sfp file use it. If not then automatically <br>generat= e a pattern with a set of rules. <br></div><div></div><div><br></div><div>J= ohn L<br></div><div><br><br>=C2=A0</div><blockquote class=3D"gmail_quote" s= tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div= class=3D"HOEnZb"><div class=3D"h5"><div class=3D"gmail_extra"><br><div cla= ss=3D"gmail_quote">2017-03-31 1:50 GMT+02:00 John Luciani (<a href=3D"mailt= o:jluciani AT gmail DOT com" target=3D"_blank">jluciani AT gmail DOT com</a>) [via <a hre= f=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank">geda-user AT delorie DOT com<= /a>] <span dir=3D"ltr"><<a href=3D"mailto:geda-user AT delorie DOT com" target= =3D"_blank">geda-user AT delorie DOT com</a>></span>:<br><blockquote class=3D"g= mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l= eft:1ex"><div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"= gmail_quote"><span>On Thu, Mar 30, 2017 at 12:26 PM, Nicklas Karlsson (<a h= ref=3D"mailto:nicklas DOT karlsson17 AT gmail DOT com" target=3D"_blank">nicklas.karls= son17 AT gmail DOT com</a>) [via <a href=3D"mailto:geda-user AT delorie DOT com" target= =3D"_blank">geda-user AT delorie DOT com</a>] <span dir=3D"ltr"><<a href=3D"mai= lto:geda-user AT delorie DOT com" target=3D"_blank">geda-user AT delorie DOT com</a>><= /span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px = 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span cl= ass=3D"m_-1026557647217627642m_-3346816896407057893gmail-">> > > &= gt; >> John Luciani:<br> > > > > >> > I create stencil footprints with the same= basename as<br> > > > > >> > the component footprint and a ".sfp&= quot; extension. I have<br> > > > > >> > a script that parses the pcb and identifi= es all components<br> > > > > >> > that have a stencil footprint.<br> > > > ><br> > > > > I couldn't find this script on your page.=C2=A0 Cou= ld you please post or<br> > > link?<br> > > > ><br> > > ><br> > > > The script isn't quite ready for prime-time.<br> > ><br> > > But you tell why these scipts are good?<br> > ><br> > ><br> > The current script identifies the footprints that should be changed wh= en<br> > generating gerbers for a stencil. The completed script will perform th= e<br> > replacement.<br> <br> </span>To put it another way. Is it better to generate paste layer from a s= cript than manually editing each footprint?<br></blockquote><div><br></div>= </span><div>I do not manually edit anything. If a part requires a stencil f= ootprint it<br></div><div>is generated with a script along with the footpri= nt.<br><br></div><div>For the other parts I do not bother. Future versions = of the script will accommodate parts<br>without sfp files by generating sli= ghtly reduced stencil openings for each pad. <br><br></div><div><div class= =3D"m_-1026557647217627642h5"><blockquote class=3D"gmail_quote" style=3D"ma= rgin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:= 1ex"> <span class=3D"m_-1026557647217627642m_-3346816896407057893gmail-"><br> <br> > > > > >> as thin line silk for checking or write the pa= ds to the sfp file.<br> > > > > >><br> > > > > >> Do you have any specific file format for your = sfp files ?<br> > > > > >><br> > > > > ><br> > > > > > I just make them as normal footprints. For example= - the stencil<br> > > > > footprint<br> > > > > > below is for a Cree XP-G LED --<br> > > > > ><br> > > > > > Element[0x0 "LED" "" "&qu= ot; 0 0 9996 2996 0 100 0x0]<br> > > > > > (<br> > > > > >=C2=A0 =C2=A0 Pad[-5511 -5511 -5511 5511 1968 2000 = 2968 "" "1" 0x0100]<br> > > > > >=C2=A0 =C2=A0 Pad[5511 -5511 5511 5511 1968 2000 29= 68 "" "2" 0x0100]<br> > > > > >=C2=A0 =C2=A0 Pad[-492 -3937 492 -3937 2952 2000 39= 52 "" "3" 0x0100]<br> > > > > >=C2=A0 =C2=A0 Pad[-492 0 492 0 2952 2000 3952 "= ;" "3" 0x0100]<br> > > > > >=C2=A0 =C2=A0 Pad[-492 3937 492 3937 2952 2000 3952= "" "3" 0x0100]<br> > > > > >=C2=A0 =C2=A0 ElementLine[7996 -2484 7996 -7996 100= 0]<br> > > > > >=C2=A0 =C2=A0 ElementLine[7996 -7996 -7996 -7996 10= 00]<br> > > > > >=C2=A0 =C2=A0 ElementLine[-7996 -7996 -7996 -2484 1= 000]<br> > > > > >=C2=A0 =C2=A0 ElementLine[7996 2484 7996 7996 1000]= <br> > > > > >=C2=A0 =C2=A0 ElementLine[7996 7996 -7996 7996 1000= ]<br> > > > > >=C2=A0 =C2=A0 ElementLine[-7996 7996 -7996 2484 100= 0]<br> > > > > >=C2=A0 =C2=A0 ElementArc[-7996 -10496 500 500 0 360= 1000]<br> > > > > > )<br> > ><br> > > The *.sfp files are used to define shapes for solder paste?<br> > ><br> ><br> > The shapes define openings in a stencil.<br> <br> </span>Then the shapes end up on the "stencil" layer, I think &qu= ot;paste" layer is a common name for this layer.<br> <span class=3D"m_-1026557647217627642m_-3346816896407057893gmail-"><br> <br> > > > For thermal pads I always use the grid. I have seen a lot of= production<br> > > > problems. Bridging and misalignments. On these large pads I = use a grid<br> > > > which reduces the coverage to between 50 - 60%.<br> > ><br> > > You use a grid because there will be production problems for a so= lid shape?<br> > ><br> ><br> > Yes. I have seen bridging and misalignments. All of the components tha= t<br> > I have used (with thermal pads) have recommended stencil openings<br> > as well as footprints. I either follow the datasheet recommendation or= <br> > the manufacturer application notes.<br> <br> </span>I do not perfectly understand this, do you have an example for examp= le datasheet or application note?<br></blockquote><div><br><br></div></div>= </div><div>The datasheet for the Cree XPG is at <br><br><cite class=3D"m_-1= 026557647217627642m_-3346816896407057893gmail-_Rm"><a href=3D"http://www.cr= ee.com/led-components/media/documents/XLampXPG-15B.pdf" target=3D"_blank">w= ww.cree.com/led-components/me<wbr>dia/documents/XLampXPG-15B.pdf</a><br><br= ></cite></div><div><cite class=3D"m_-1026557647217627642m_-3346816896407057= 893gmail-_Rm">Near the end of the file are the footprint and stencil </cite= ><br><cite class=3D"m_-1026557647217627642m_-3346816896407057893gmail-_Rm">= recommendations. </cite></div><div><br>=C2=A0</div><blockquote class=3D"gma= il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2= 04,204);padding-left:1ex"> <br> <br> Regards Nicklas Karlsson<span class=3D"m_-1026557647217627642HOEnZb"><font = color=3D"#888888"><br> </font></span></blockquote></div><span class=3D"m_-1026557647217627642HOEnZ= b"><font color=3D"#888888"><br><br clear=3D"all"><br>-- <br><div class=3D"m= _-1026557647217627642m_-3346816896407057893gmail_signature"><a href=3D"http= ://www.wiblocks.com" target=3D"_blank">http://www.wiblocks.com</a> =C2=A0</= div> </font></span></div></div> </blockquote></div><br></div> </div></div></blockquote></div><br><br clear=3D"all"><br>-- <br><div class= =3D"gmail_signature" data-smartmail=3D"gmail_signature"><a href=3D"http://w= ww.wiblocks.com" target=3D"_blank">http://www.wiblocks.com</a> =C2=A0</div> </div></div> --f403045f74b807bddb054c1e08dd--
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