TECHNET Archives

December 2003

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Lakshmi Dwivedula <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 4 Dec 2003 20:16:09 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (100 lines)
I have seen self tapping screws used extensively:

a. to affix thin aluminum name plates onto deliverable units.
b. to assemble covers to sheet-metal chassis. 

In both cases, no flat washers were used. As a matter of fact, in the second
case, the screw is supposed to bite into both the metal bodies to achieve
valid grounding - in RF applications.

Regards,
Lakshmi

-----Original Message-----
From: Crepeau, Phil [mailto:[log in to unmask]]
Sent: Thursday, December 04, 2003 8:03 PM
To: [log in to unmask]
Subject: Re: [TN] Taptite and washers


hi,

ipc 610 covers all fasteners in the sense that you use whatever the drawing
tells you to use.  about the only thing it's specific about is that a flat
washer needs to be against the laminate that is exposed to a rotating
surface on the fastener to prevent the laminate from being damaged.  i
imagine that the minimum no. of threads that extend beyond the 'tapped'
surface could still be used.

phil

-----Original Message-----
From: Torben S. Taustrup [mailto:[log in to unmask]]
Sent: Wednesday, December 03, 2003 1:28 AM
To: [log in to unmask]
Subject: [TN] Taptite and washers


Our company has adapted the IPC-A-610C standard. We often use self tapping
screws like taptites when mounting PCB's in boxes.
In the above mentioned standard this type of screws are not mentioned - only
screws with "regular" thread. When using these one or two washers are
mandaory depending on the material.

My question is, does the IPC standard include self tapping screws?

Is it necessary to use washers in connection with self tapping screws?

The automobile industry uses a variety of self tapping screws and in most
instances no washer is used - and this seems to work fine.

Regards

Torben Taustrup

----------------------------------------------------------------------------
Torben Taustrup - [log in to unmask]
PTA, Technical Assistant / Radio Mechanic
Vestas Wind Systems A/S
Paludan-Müllers Vej 82, 8200 Århus N
Tlf: +45 97 30 40 31   Telefax: +45 97 30 40 01
----------------------------------------------------------------------------

---------------------------------------------------
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
847-509-9700 ext.5315
-----------------------------------------------------

---------------------------------------------------
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
847-509-9700 ext.5315
-----------------------------------------------------

---------------------------------------------------
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 847-509-9700 ext.5315
-----------------------------------------------------

ATOM RSS1 RSS2