My experience is to use Geometric Tolerancing if your design requires it. It
is generally not required on all designs. Also, most board shops do not
understand the tolerancing, and you end up with a board only as good as the
accuracy of the drilling and routing machine are capable of producing.

> ----------
> From:         Ross A. Eskite
> Sent:         Monday, April 13, 1998 4:36 PM
> To:   [log in to unmask]
> Subject:      [TN] Geometric dimensioning & tolerancing
>
> Greetings-
>
> We are currently in the midst of a lively discussion
> in our CAD department over the pros and cons of
> geometric dimensioning and tolerancing (GDT) when
> used on PWB fabrication drawings.  From what I've seen:
>
> Pros:
>   More accurate (potentially)
>   Provides maximum producibility in achievement of
>     desired fit (when competently applied)
>   "Encouraged" by IPC
>
> Cons:
>   Poorly understood by many draftsmen
>   Poorly understood by some board shops (this bothers me)
>   Takes longer to produce a drawing
>   Many consider it "overkill"
>
> I'd like some feedback from other designers, board shops,
> ME's, etc., on this issue.  Has anyone had any compellingly
> positive or negative experiences with GDT?  Would you write
> it into *your* PWB CAD process?
>
> TIA,
> --
> Ross Eskite
> "Though I fervently recite the Mass in perfect Latin to the cannibals,
> somehow I always end up in the big black pot with the carrots" - me
>
> ################################################################
> TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
> ################################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in the body:
> To subscribe:   SUBSCRIBE TechNet <your full name>
> To unsubscribe:   SIGNOFF TechNet
> ################################################################
> Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional
> information.
> For the technical support contact Dmitriy Sklyar at [log in to unmask] or
> 847-509-9700 ext.311
> ################################################################
>

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
################################################################