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Subject:	RE: Mixed Metric and Inch Components
From:	Greg Goodenbury <[log in to unmask]>
Date:	Wed, 7 Aug 1996 17:15:11 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (51 lines)


The most common problem I've seen in using footprints created with mixed units of measure is the way in which the CAD system handles them when automatically converting to a common unit of measure.  More specifically, when a CAD system converts from one unit of measure to another, there may be an accumulation of rounded-off dimensions during the process, that may result in footprint patterns with slightly distorted pad locations.

The problem is common to fine pitch components and components with unusual lead spacing dimensions.  Just be sure to dimensionally verify your footprints prior to starting the routing phase.


Greg Goodenbury

Conquest Technology, Inc.        email: [log in to unmask]
95 E. Mitchell Hammock Road        Tel: 407-359-1919
Oviedo, FL 32765-4705              Fax: 407-359-1918


--------------------------------------------------------------
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From: 	R.D. Munger[SMTP:[log in to unmask]]
Sent: 	Wednesday, August 07, 1996 6:54 AM
To: 	[log in to unmask]
Subject: 	Mixed Metric and Inch Components

We have a design using component footprints constructed of both inch and
metric dimensions and would like to know what problems this could cause
during routing.

And is this mixture a "normal" occurrence with many designs today?

Thanks.

Dan Munger
Fermilab
Batavia, IL USA
[log in to unmask]

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