Well now you have answered this makes you expert so can I ask a
supplementary?
This is not my field, but are polymer substrate materials that stable?
So even if the boards were cut that p/m how would receiver measure?

Regards

Mike



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Eric Christison
Sent: Wednesday, February 19, 2003 9:31 AM
To: [log in to unmask]
Subject: Re: [TN] Tolerances


Hi Lorraine,

Didn't see any other replies so I thought I'd give you my opinion.

0.05 is, in my opinion, barely achievable in a production environment. You
may
or may not be lucky. I would suggest +/-0.10mm is a more realistic tolerance
for routing. If you need better than that then you'll have to buy a punch.

Regards,



> [log in to unmask] wrote:
>
> Can anyone please advise if it is possible to rout a bare PCB (fab) to a
> tolerance of +/- 0.05 mm?  The board is 0.8mm thick.
>
> One of our vendors is telling us that they can't manufacture to this and
> that they don't believe it is possible.  A second vendor has led us to
> believe that they can do but experience tells us that they aren't making
> it!  For info the boards are designed to fit snugly into a plastic housing
> with no other means of fixing - hence the tight tolerance.
>
> Thanks in advance for any feedback received.
>
> Lorraine Reid
>
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--
Eric Christison
Mechanical Engineer
STMicroelectronics
33 Pinkhill
Edinburgh
EH12 7BF

tel:    +44 (0)131 336 6165
fax:    +44 (0)131 336 6001

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