I agree
A lot of machines won't cope with the bow and twist permitted in the
standard.
Rex 


Rex Waygood
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: 05 September 2008 18:58
To: [log in to unmask]
Subject: Re: [TN] Bow and Twist Measrement

The tighter one.  Surface mt.
You need to gear it to the component most susceptible to damage from
Warp/Twist 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani
Sent: September 5, 2008 11:53 AM
To: [log in to unmask]
Subject: [TN] Bow and Twist Measrement

Hello All,

 

IPC-A-610 Rev. D, Section 10.2.7 allows 1.5% and 0.75% Bow and Twist for
Through-hole and surface mount assemblies accordingly. What percentage
should I be applying if the assembly has mixture of surface mount and
through-hole components?

 

Thank you in advance,

Paymon Sani


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