Re: [PEDA] closing pads on paste mask
That's for sure. The exception where I see (and have) the need for avoiding solder paste is where I have designed for several assembly variants with intersecting component patterns due to constraints in available board area. There it is required to avoid solder paste for example underneath any IC package. Emanuel Brad Velander wrote: Good suggestion Dennis, a reflow soldered pad will be much easier to solder a component into at any later point in time, especially after the board has possibly gone through several heat or reflow cycles. This would not be such an issue if the board was plated with tin/lead and reflowed during fabrication. For OSP, organic silver, organic tin and even some gold flash treatments this could be critical to possible future soldering of those pads. Sincerely, Brad Velander. Lead PCB Designer Norsat International Inc. #300 - 4401 Still Creek Drive, Burnaby, B.C., Canada, V5C 6G9. Tel (604) 292-9089 (direct line) Fax (604) 292-9010 Website: www.norsat.com -Original Message- From: Dennis Saputelli [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 9:22 AM To: Protel EDA Forum Subject: Re: [PEDA] closing pads on paste mask more than one assembler has advised me to let unpopulated parts be solder pasted and reflowed as if there were parts on them the reason given was that the pads if not pasted get tarnished and crummy looking (it's also easier!) Dennis Saputelli -- MPL AG www.mpl.ch Emanuel Zimmermann [EMAIL PROTECTED] Manager RD Phone: +41 (0)56 483 34 34 Taefernstrasse 20 Fax: +41 (0)56 493 30 20 CH-5405 Daettwil * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] closing pads on paste mask
more than one assembler has advised me to let unpopulated parts be solder pasted and reflowed as if there were parts on them the reason given was that the pads if not pasted get tarnished and crummy looking (it's also easier!) Dennis Saputelli Emanuel Zimmermann wrote: Our production people do that sort of things with very thin tapes. This has the advantage of avoiding separate paste masks for every assembly variant for small production lot quantities. However, if your production lots are quite big you could set the paste mask enlargment for the parts in question to negative values. This is done in the advanced tab of the properties dialog box when double clicking the component in the PCB editor. Emanuel Georg Beckmann wrote: some boards are party assembled and some places for components left free. For this purpose the production wants a paste mask with closed pads for this parts. Has anybody an idea how this is done clever. Georg -- MPL AG www.mpl.ch Emanuel Zimmermann [EMAIL PROTECTED] Manager RD Phone: +41 (0)56 483 34 34 Taefernstrasse 20 Fax: +41 (0)56 493 30 20 CH-5405 Daettwil -- ___ www.integratedcontrolsinc.comIntegrated Controls, Inc. tel: 415-647-04802851 21st Street fax: 415-647-3003San Francisco, CA 94110 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] closing pads on paste mask
Good suggestion Dennis, a reflow soldered pad will be much easier to solder a component into at any later point in time, especially after the board has possibly gone through several heat or reflow cycles. This would not be such an issue if the board was plated with tin/lead and reflowed during fabrication. For OSP, organic silver, organic tin and even some gold flash treatments this could be critical to possible future soldering of those pads. Sincerely, Brad Velander. Lead PCB Designer Norsat International Inc. #300 - 4401 Still Creek Drive, Burnaby, B.C., Canada, V5C 6G9. Tel (604) 292-9089 (direct line) Fax (604) 292-9010 Website: www.norsat.com -Original Message- From: Dennis Saputelli [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 9:22 AM To: Protel EDA Forum Subject: Re: [PEDA] closing pads on paste mask more than one assembler has advised me to let unpopulated parts be solder pasted and reflowed as if there were parts on them the reason given was that the pads if not pasted get tarnished and crummy looking (it's also easier!) Dennis Saputelli * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] closing pads on paste mask
Some boards are party assembled and some places for components left free. For this purpose the production wants a paste mask with closed pads for this parts. Has anybody an idea how this is done clever. Georg Beckmann Define a (Paste Mask Expansion) Design Rule, and set an expansion value which is sufficiently negative to mask all of the pads concerned. I would suggest defining a Component Class, with a name like NoPasteMask (for instance), and add all appropriate components to that class. The Design Rule's selection criteria should then be that (component) class. Regards, Geoff Harland. - E-Mail Disclaimer The Information in this e-mail is confidential and may be legally privileged. It is intended solely for the addressee. Access to this e-mail by anyone else is unauthorised. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. Any opinions or advice contained in this e-mail are confidential and not for public display. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] closing pads on paste mask
Our production people do that sort of things with very thin tapes. This has the advantage of avoiding separate paste masks for every assembly variant for small production lot quantities. However, if your production lots are quite big you could set the paste mask enlargment for the parts in question to negative values. This is done in the advanced tab of the properties dialog box when double clicking the component in the PCB editor. Emanuel Georg Beckmann wrote: some boards are party assembled and some places for components left free. For this purpose the production wants a paste mask with closed pads for this parts. Has anybody an idea how this is done clever. Georg -- MPL AG www.mpl.ch Emanuel Zimmermann [EMAIL PROTECTED] Manager RD Phone: +41 (0)56 483 34 34 Taefernstrasse 20 Fax: +41 (0)56 493 30 20 CH-5405 Daettwil * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
