ok
> ----------
> From: Edward Brunker[SMTP:[log in to unmask]]
> Sent: Friday, February 19, 1999 4:32 AM
> To: [log in to unmask]
> Subject: Re: [TN] TechNet: confirmation required (6F2282)
>
> ok
>
> ______________________________ Reply Separator
> _________________________________
> Subject: TechNet: confirmation required (6F2282)
> Author: "L-Soft list server at IPC (1.8c)" <[log in to unmask]> at
> INTERNET
> Date: 19/02/99 04:21
>
>
> The TechNet list has been configured to request explicit confirmation of
> all
> messages posted to the list, for security reasons. You must now confirm
> that
> the message enclosed below did originate from you. To do so, simply reply
> to
> the present message and type "OK" (without the quotes) in the text of
> your
> message. If this does not work, or if the message did NOT originate from
> you,
> contact the list owner for assistance.
>
> ------------------ Original message (ID=6F2282) (91 lines)
> --------------------
> Received: from simon.ipc.org by jefry.ipc.org (LSMTP for Windows NT v1.1a)
> with
> TP id <[log in to unmask]>; Fri, 19 Feb 1999 4:21:24 -0600
> Received: from mailgate.psion.com by simon.ipc.org via ESMTP
> (951211.SGI.8.6.12.
> TCH1502/940406.SGI)
> for <[log in to unmask]> id EAA01676; Fri, 19 Feb 1999 04:10:17 -0800
> Received: from smtpgate.psion.com (smtpgate.psion.com [194.129.2.239])
> by mailgate.psion.com (2.5 Build 2640 (Berkeley 8.8.6)/8.8.4)
> with
> SMTP id KAA00291 for <[log in to unmask]>; Fri, 19 Feb 1999
> 10:10:54 GMT
> Received: from ccMail by smtpgate.psion.com (ccMail Link to SMTP
> R8.20.00.25)
> id AA919420092; Fri, 19 Feb 1999 10:28:17 GMT
> Message-Id: <[log in to unmask]>
> X-Mailer: ccMail Link to SMTP R8.20.00.25
> Date: Fri, 19 Feb 1999 10:19:56 GMT
> From: "Edward Brunker"<[log in to unmask]>
> To: <[log in to unmask]>
> Subject: Re[2]: [TN] Squeegee Speed
> MIME-Version: 1.0
> Content-Type: text/plain; charset=US-ASCII
> Content-Transfer-Encoding: 7bit
> Content-Description: "cc:Mail Note Part"
>
>
>
> >The factorinfluencing this effect is how stencil gaskets to the board and
> >you may need to look as points such as : Board finish
>
> >Regards
> >Edward Hale
>
>
> I find this aspect intersting. Resist height is always more than the
> plated copper height. For all alternative finishes with LPI, in my
> experience. The resist over traces leading to pads brings the resist
> up even more. The dome on HASL boards will protrude above, but only
> for a portion of the pad, the edges still remain lower.
> Does anyone spec the resist height to be less than the pads?
> So stencils rest on the resist leaving 10 - 30 microns of free space
> underneath.
>
>
> Regards
> Edward Brunker
>
>
> >Evenin' all!
> >
> > My question is this: My stencil printer operator has said that
> he
> >has to
> >wipe our 6-mil stencil each pass to get the paste in the 20-mill pitch
> >aperatures for a QFP to release well. We are using Amtech NC-559 type 3
> >paste with 89.5% metal. The paste is not old. I considered using type 4
> >paste, which has a much finer powder in it. I was told by Amtech that
> this
> >finer powder paste will pack more densly into the aperatures and I could
> get
> >some bridging, unless I order a new stencil with aperature reductions.
> Our
> >squeegee speed is 0.6 inches/s, or 15mm/s. Is this too slow? Amtech
> >suggested that at this slow speed, the paste could be rising out of the
> >aperature, as if someone pressed on a wet sponge and it rose back to its
> >original shape. What is a good squeegee speed for 20 mil pitch parts?
> >Thanks all!
> >
> >Ryan Jennens
> >TelGen Corp.
> >
> >################################################################
> >TechNet E-Mail Forum provided as a free service by IPC using LISTSERV
> 1.8c
> >################################################################
> >To subscribe/unsubscribe, send a message to [log in to unmask] with
> >following text in the body:
> >To subscribe: SUBSCRIBE TechNet <your full name>
> >To unsubscribe: SIGNOFF TechNet
> >################################################################
> >Please visit IPC's web site (http://www.ipc.org) "On-Line Services"
> >section for additional information.
> >For technical support contact Hugo Scaramuzza at [log in to unmask] or
> >847-509-9700 ext.312
> >################################################################
>
> ################################################################
> TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
> ################################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text
> n the body:
> To subscribe: SUBSCRIBE TechNet <your full name>
> To unsubscribe: SIGNOFF TechNet
> ################################################################
> Please visit IPC's web site (http://www.ipc.org) "On-Line Services"
> section for
> ditional information.
> For technical support contact Hugo Scaramuzza at [log in to unmask] or
> 847-509-9700
> t.312
> ################################################################
>
> ################################################################
> TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
> ################################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in the body:
> To subscribe: SUBSCRIBE TechNet <your full name>
> To unsubscribe: SIGNOFF TechNet
> ################################################################
> Please visit IPC's web site (http://www.ipc.org) "On-Line Services"
> section for additional information.
> For technical support contact Hugo Scaramuzza at [log in to unmask] or
> 847-509-9700 ext.312
> ################################################################
>
################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe: SUBSCRIBE TechNet <your full name>
To unsubscribe: SIGNOFF TechNet
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################
|
