Dear Jos Aarninkhof, SPA networks Almelo, The Netherlands

Thanks for your reply. I have IPC_SM_782 spec (reva-aug1993). Chapter3 does 
tell about panels but does not clearly elaborate on the allowable min. 
distance between edge of v groove and nearest component. I am having a board 
with 0.095 thk, FR4 material,v goove 60 degrees, uncut is 0.024,, v groove 
is 0.040 wide at surface,  The nearest cap is 0.020 from the edge of groove 
before cut. We are using Cab Maestro 4M PCB cutter ,single pass blade angle 
10 degrees.We are sure whether problem is coming from cutter process or 
design of board itself.
I will appreciate technical advise on this. In case you find the old 
standard cover clear picture on the clearance issue, I will appreciate fax 
copy of that page.
If you can advise us on this we will appreciate technically very much.
email: [log in to unmask]
fax:204-257-9104
tel:204-257-9199(It is hard to find me at desk)

 ----------
From: Jos Aarninkhof
To: Dhawan, Ashok        CA-WINPO2
Cc: [log in to unmask]
Subject: Re: component breakage at panel separation station
Date: Thursday, May 01, 1997 7:15AM

Dhawan, Ashok CA-WINPO2 wrote:
>
> We are looking for some kind of guidelines/ specification for verifying 
that
> panel design is acceptable.                                      We are
> getting panelised boards of various kind and designs from others and many 
a
> times , we find that some components closer to the edges are breaking
> randomly. Most of the boards are 2 layers and double sided .
>
> Is there IPC spec or design guidelines which can be used to verify 
validity
> of design \land-pattern layout? please advise on net or directly.email.
>
> thanks.
>
> ashok
> email: [log in to unmask]
>
> 
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Dear Ashok,

IPC-SM-782 gives you an overview of the different design rules
concerning SMD but also gives an statement about clearance at the sides
to assure good boardhandling during production and breaking down of the
panel. In the old issue from march 1987(there is a revised issue from
august 1993) is on page 56, chapter 7.1 a detailed figure giving you the
data you need.

Best Regards

Jos Aarninkhof
SPA Nedworks Almelo
The Netherlands

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