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September 2005

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Subject:
Re: Okay, all you real smart guys.........
From:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bev Christian <[log in to unmask]>
Date:
Thu, 29 Sep 2005 16:34:12 -0400
Content-Type:
text/plain
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text/plain (169 lines) 
Clarification: I was using weight and mass interchangeable which is
technically wrong.

Dewey I see is in true form.

Bev
RIM

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: September 29, 2005 4:26 PM
To: [log in to unmask]
Subject: Re: [TN] Okay, all you real smart guys.........

Jason,
Richard is right.
You can:
 1) Run a board through the oven with paste only to get the weight of
the solder and the flux residue (ignoring any outgassing by the board).
2) Or less accurately, use your file for your stencil to determine the
volume of the apertures, assume a certain level (less than 100%) of
paste release, assume the solder is 50% of the volume of the paste,
ignore the flux residue, use the density of the solder and get the mass
of the solder laid down on the board.

Bev
RIM


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard
Sent: September 29, 2005 3:57 PM
To: [log in to unmask]
Subject: Re: [TN] Okay, all you real smart guys.........

You need to subtract the weight of the solder from the delta of the
assembly minus the pwb to get the true weight of the components.
May I ask why you are trying to determine this? 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ryan Grant
Sent: Thursday, September 29, 2005 2:51 PM
To: [log in to unmask]
Subject: Re: [TN] Okay, all you real smart guys.........

The weight of the populated PCB minus the weight of the bare PCB will
give you the total or combined weight of the components.  But if you
want the weight of individual components, you're going have to actually
measure each one...:( 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Gregory
Sent: Thursday, September 29, 2005 1:42 PM
To: [log in to unmask]
Subject: [TN] Okay, all you real smart guys.........

Can someone point me in the right direction on determining mass of
components of a PCB, knowing:

the weight of a bare PCB
the weight of a populated PCB
number of terminations
etc.

Who knows the formula?

TIA

Jason Gregory
Manufacturing Engineer
Innova Electronics
(281)653-5593
(281)653-5594 fax
(281)212-0844 cell
[log in to unmask]

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