thanks for your reply .. But,I am not clear about the consideration that you mentioned regarding the hood/shell of the two cables and there not being enough space for both of them.
I plan to screw the two connectors together on opposite sides of the board and then each connector will act as a socket for a SCSI cable ... the SCSI cable will NOT be screwed to the connector OR to the board. It will simply be inserted into the corresponding socket and left ( hanging ). I assumed this is alright ,because there is a "very snug" fit between this cable and the connector. I hope I've been able to explain well ... One more concern : I plan to have 16 such connector-cable pairs on my board ... do you anticipate any problems with this arrangement ? please do reply , thanks very much best regards Anand Kulkarni -- On Thu, 19 Dec 2002 11:32:43 Bagotronix Tech Support wrote: >Anand: > >There is no such thing as "perfectly" aligned. PCBs are usually made with a >+/-0.005 in. tolerance on drill operations (hole drilling, etc.). You can >ask board shops for tighter tolerances, but it will cost you more. > >For what you are trying to do, the standard +/-0.005 in. tolerance should be >sufficient. The only difficulty I foresee with what you want to do is the >actual board assembly (component stuffing) process. Large SMT parts on both >sides is tricky - the one on the bottom will probably have to be hand placed >and manually reflowed. Then, after reflowing, screws and nuts are >installed. > >One other consideration: is there enough space between the connectors to >actually put mating cables on them? Separating them by only a PCB thickness >(0.062 in.) doesn't seem like enough room for the hood/shell of both cables. > >Best regards, >Ivan Baggett >Bagotronix Inc. >website: www.bagotronix.com > > >----- Original Message ----- >From: "Anand Kulkarni" <[EMAIL PROTECTED]> >To: "Protel EDA Forum" <[EMAIL PROTECTED]> >Sent: Thursday, December 19, 2002 11:17 AM >Subject: [PEDA] question about connectors and PCB manufacturers > > >> Hi everybody, >> I have a question about the capability of PCB manufacturers. >> >> I have a surface mount SCSI connector with 68 pads . >> >> 050 inch x .100 inch Center - SCSI 3 Compatible - Shrouded Straight - >Surface Mount Socket >> >> example : 2 identical connectors : >> _________________________________________ >> | _________________________ | >> | o / \ o | >> | --------------------------- | >> ----------------------------------------- >> Connector 1 >> >> _________________________________________ >> | _________________________ | >> | o / \ o | >> | --------------------------- | >> ----------------------------------------- >> >> Connector 2 >> >> >> Now this connector has got 2 holes , 1 on each end , apparently for >screwing to the board. >> >> Now, I want to place these connectors on opposite sides of the board. >> i.e, one connector on the top surface and the other connector on the >bottom surface ; >> and I want them be perfectly aligned to each other , as seen in the top >view. >> >> further ,I want to screw them "TOGETHER" through the board. >> i.e, nuts on both the top and bottom surface and the thread passing >through the vertically >> aligned holes. Again the holes have to be perfectly aligned. >> >> Also , the pads have to be prefectly aligned. >> >> Is this "alignment" something that I can expect the PCB manufacturer to >easily achieve ? >> >> Please do reply with your suggestions, >> >> thanks very much, >> >> regards >> >> Anand Kulkarni >> >> >> > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
