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September 2005

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Subject:
From:
"Stadem, Richard" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard
Date:
Fri, 16 Sep 2005 08:26:02 -0500
Content-Type:
text/plain
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text/plain (214 lines)
Ramon,
I am so glad to be of help. Perhaps I can provide more helpful
information on the scoring vs. routing for the rest of the forum?
Within IPC 7095A on page 65 and 66 is a description of different methods
of panelization. Look at figure 7-5 and understand each of the
dimensions and what it does. This drawing can be used directly on the
pwb fabrication print and dimensioned as appropriate. Make sure the pwb
company has input on the dimensions, as most fabricators have a lot of
experience with scoring. I am surprised at how many do not know very
much about this, but here in the Midwest I know of hundreds of companies
using it rather than routing/ratbites. The CAB machines for depaneling
work exceptionally well. I prefer the motorized version, however many
operators like the manual versions just as much. While they look
dangerous, they are not. I have never seen or heard of anybody getting
hurt on one. The are not sharp, as you noted, but work extremely well in
singulating the panels without applying any stress.
The information on 7095A pg 65 and 66 is somewhat limited in the amount
of "possibilities" of potential panelization schemes that can save so
many companies out there thousands of dollars in fabrication costs,
design simplification, reduced scrap costs, and evade the tooling costs
of automatic depaneling equipment. Remember, the dust is considered a
very hazardous by-product of these automatic milling machines. But there
is a niche for them in high-volume applications where the design does
not work well for scoring.
One key idea in considering a scheme for depaneling is to use routing
combined with score lines. Think outside of the box, ie, the route can
extend slightly past the score line to get a clean corner. You can run
the pizza cutter right through a route or other gap without any
problems. The bottom blade on the depaneling machine keeps the board
traveling in a straight line even when the upper wheel bumps through
gaps and routes.
Cost savings can be realized in the design process, as the designers
hate having to determine the route widths, the drill pattern
dimensioning, etc. that the route/ratbite method requires. What could be
easier than dimensioning a score line that defines the side of two
adjacent pwbs within the panel? 
Other things to watch: Keep the components at least .050" away from the
scored edge. If overhanging connectors are required, put them all on two
opposing sides of the pwb (routed) so that the score lines can run on
the other two sides, etc.
There are a lot of considerations and planning to come up with a good
panel format that provides the least cost of fabrication, cost of
de-paneling, cost for design, etc. But the possibilites for different
schemes are endless, and the potential cost savings are huge.
And happy Friday, all.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon
Sent: Friday, September 16, 2005 7:46 AM
To: [log in to unmask]
Subject: Re: [TN] Mouse Bites

 

        Hi Richard:
                        The under 4K that you are referring to is the
3E?. I talked with Joe Komus from CAB and he explained to me in detailed
the simple and at the same time effective method their equipment uses.
He said that 90% of their customers uses the groove paneling that is
broken by a pizza cutter type of blade that is not even sharp, no dust
nor smell. Thank you for enlighten me on this matter. No, I did not know
depaneling except the expensive routers that chew up boards and make a
lot of dust and stink. Once again have a great day and you made my day.
        Regards,
        Ramon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard
Sent: Thursday, September 15, 2005 12:19 PM
To: [log in to unmask]
Subject: Re: [TN] Mouse Bites

Ramon,
You may already be aware of this, but panelization using scored lines
and a depaneling machine ($4000 or less from CAB) works much better than
tabs/mousebites. The routing required to get the tabs, and the tiny
holes required to drill the mousebites into the tabs quickly drives up
the cost of the fab pwb.
I even use scored grooves in combination with some milling in order to
avoid the mousebite/tab method of panelization if the pwb has irregular
sides or curves. There are no expensive routers to buy, the skill level
required to depanel is greatly reduced, the cost of the fab is greatly
reduced, and the problems associated with depaneling mousebites is
eliminated (pulled soldermask, damaged boards, etc.). Also, no stress is
placed on the components when the depaneling is done with the CAB
machines, as they separate the pwbs in a lateral direction, as opposed
to the stress applied if the depaneling is done by "breaking" the
assembly out of the panel via the mousebite tabs.
However, I know there are some designs where you cannot depanel any
other way. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jerry Dengler
Sent: Thursday, September 15, 2005 1:49 PM
To: [log in to unmask]
Subject: Re: [TN] Mouse Bites

Ramon,

Mouse bites in the middle of the break away tabs are hard on operators
hands after de-panelization. 
They may interfere with board mounting.
They look bad on the finished board.

Other than these points they can work fine.

Jerry Dengler
Production Manager
Pergamon Corporation
PH:  610-239-0721
Fax: 610-239-0720
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon
Sent: Thursday, September 15, 2005 2:37 PM
To: [log in to unmask]
Subject: [TN] Mouse Bites

 
        Hi Technetters:
        Panelized boards are connected through mouse bites to the break
away tabs. It is my understanding and I see the reason for the mouse
bites to be close to the board. Does anybody out there have experience
with mouse bites placed in the middle, between the boards and the tabs,
or close to the break away tab? The material used is FR4.
        Regards,
        Ramon



        Note:  On a post a few weeks ago about dry boards. I found out
that there are two types of dry board markers regular and low odor
markers and two types of dry boards. Low odor markers are the new type
available and stay on the old type of dry boards( hard to erase). The
new type of boards are sleeker. The solution I found out was to go to
Home Depot and buy a 4' X 8' dry board sheet for $9.95 and replace the
old board with the new by using the old frame and it works.

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