TECHNET Archives

May 2008

TechNet@IPC.ORG

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

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

Print Reply
Sender:
X-To:
TechNet E-Mail Forum <[log in to unmask]>, Dan Mathews <[log in to unmask]>
Date:
Tue, 20 May 2008 12:23:15 -0400
Reply-To:
TechNet E-Mail Forum <[log in to unmask]>, Bev Christian <[log in to unmask]>
Subject:
From:
Bev Christian <[log in to unmask]>
content-transfer-encoding:
quoted-printable
In-Reply-To:
Content-Type:
text/plain; charset="US-ASCII"
MIME-Version:
1.0
Parts/Attachments:
text/plain (96 lines)
It depends.

The smaller the aperture, the less paste left on the board.
The thicker the stencil the less paste left on the board.
And then you have your aperture ratio that combines the two.
And then there is which specific paste you are talking about.
Etc., etc.

I would say to be safe - between 0 and 100%.  But I think we can say it
is usually between 30 and 90%.  I am a lab rat, so process engineers may
be able to refine this a bit.

Bev
RIM

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dan Mathews
Sent: Tuesday, May 20, 2008 12:10 PM
To: [log in to unmask]
Subject: [TN] Average paste volume estimate

 Does anyone have an easy way to estimate how much paste is applied to a
smt pcb? I understand it varies on 

squeegee pressure, stencil thickness, and pitch of the components but I
was looking for an average. I would

assume that somewhere out there someone can estimate that "2 grams of
paste is used on a 2" x 2" smt pcb". 

 

 I will then use this information to determine how much lead is used on
non-RoHS products due to solder paste 

issues and not non-compliant components. 

 

Thank You in Advance,

Dan

 

Dan Mathews C.I.D.+

Engineering Support Supervisor

B&B Electronics

Ottawa, IL USA 61350

Phone: 815-433-5100 ext 217

Fax: 815-434-8831 (direct to my desk)

URL: http://www.bb-elec.com <http://www.bb-elec.com/> 

 

 

 


---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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
-----------------------------------------------------

---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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
-----------------------------------------------------

ATOM RSS1 RSS2