Placing tabs to the flex portion is not a good practice, it can lead to torn
flex cables!

Marc Strickland
Technical Sales Engineer
Tyco Printed Circuit Group
29703 Niguel Rd. #H
Laguna Niguel, California 92677
(tel and fax) 949-495-6602
[log in to unmask]
http://www.tycoint.com

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Roy M Keen
Sent: Sunday, August 16, 1998 9:39 AM
To: [log in to unmask]
Subject: Re: [TN] Separating Flex Circuits


At Rockwell Collins, we typically put tabs on the rigid portion of the
printed boards only.  Tabs on rigid boards are milled off with a router.
Tabs, if they occur on a flex portion of a rigid-flex are cut manually with
an exacto knife.

Regards,
Roy Keen, Application Engineering
Telephone:   319-295-3305
FAX:   319-295-3177
Email:  [log in to unmask]





"Russell W. Furumasu" <[log in to unmask]> on 08/12/98 07:48:25 AM

Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
      to [log in to unmask]

To:   [log in to unmask]
cc:
Subject:  [TN] Separating Flex Circuits




Just a general question for the Forum.

When individual rigid flex circuits are fabricated in arrays or panelized,
what are some of the techniques (manual vs machine) used for separating
them following assembly to prevent tearing of the flex sections?  Are any
particular "breakaway" tab configuratons, or designs, recommended?  Any
recommendations on positioning such tabs?  Flex core would be either FR-4
or polyimide; hardboard sections would be four-layer, 0,062in thick.  Any
guidance would be appreciated.
Thanks

Russ Furumasu
Rockwell Automation

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