Hello,
I happen to be trouble with screws and nuts on the PCBA recently. Can someone point to a site to show how mechanical hardware assembly installation is carried out on PCBA?
I have come across all sort of assembly configuration on just the screw, washers and nut on PCBA that I did not know which is correct. Different engineers used different method and even different screw or nuts on the same build PCBA. What should be correct hardware assembly configuration.
Thanks and regards,
Wee Mei
----- Original Message -----
From: "Stadem, Richard D." <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, October 13, 2006 3:02 AM
Subject: Re: [TN] Compression Limit on FR4?
> Hi, Jack
> I can tell you that typically the torque setting used for hardware on
> pwb assemblies is between 1 to 6 in/lbs. More than that tends to deform
> the fiberglass over time. Of course, it all depends on the type of board
> material, layer count, etc.
> It also depends on the application.
> Realize that a lot of relaxation occurs during any type of thermal
> excursion, and the hardware will loosen up. It is always a good idea to
> use a Bellville washer in conjunction with a serrated or star washer to
> continue to hold the torque. It is also a good idea to use Glyptol or
> some other threadlocker.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
> Sent: Thursday, October 12, 2006 1:54 PM
> To: [log in to unmask]
> Subject: [TN] Compression Limit on FR4?
>
> Does anyone know of any guidelines or recommendations that suggest a
> maximum limit on compressing board material?
>
> Can any damage occur by over-torque'n screws, for example?
>
> I've never heard anyone discuss that...
>
> Jack
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 1.8e To
> unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
> (re-start) delivery of Technet send e-mail to [log in to unmask]: SET
> Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the
> posts: send e-mail to [log in to unmask]: SET Technet Digest Search the
> archives of previous posts at: http://listserv.ipc.org/archives Please
> visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for
> additional information, or contact Keach Sasamori at [log in to unmask] or
> 847-615-7100 ext.2815
> -----------------------------------------------------
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 1.8e
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
> -----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
>
|
