Though IPC 610D sections 10.2.7 mentioned acceptable for class 1, 2 and
3 as long it does not cause damage during post solder assembly
operations or end use. Consider "form, fit and function" and product
reliability.  Only IPC 600 (raw PCB) mentioned it is not acceptable.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rex Waygood
Sent: Monday, 8 September 2008 4:21 PM
To: [log in to unmask]
Subject: Re: [TN] Bow and Twist Measrement

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


Rex Waygood
Technical Manager
 
PartnerTech Poole Ltd 
Benson Road
Poole
Dorset BH17 0RY
United Kingdom
 
Tel: +44 (0)1202 674333
Fax: +44 (0)1202 678028
DDI: +44 (0)1202 338222
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[log in to unmask]
www.PartnerTech.co.uk

-----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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