# Re: [PEDA] [PROTEL EDA USERS]: Confused Newbie on Footprints

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Using 2/3 of an inch or .67 of an inch, its obvious which one is the more
accurate. Maybe
fractions rather than rounded decimals used in conversions would allow better
accuracy.

_______________________________________________________________

Clive Broome
IDT Sydney Design Centre        Ph:         +61 2 9763 3513
8 Bayswater Dr, Homebush        Fax:        +61 2 9763 3409
Sydney,  NSW, 2127              Email:[EMAIL PROTECTED]
Australia

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Abd ul-Rahman Lomax <[EMAIL PROTECTED]> on 03/07/2001 10:27:18 AM

To:   Multiple recipients of list proteledausers
<[EMAIL PROTECTED]>
cc:    (bcc: Clive Broome/sdc)

Subject:  Re: [PROTEL EDA USERS]: Confused Newbie on Footprints

At 08:50 AM 3/7/01 +1000, [EMAIL PROTECTED] wrote:

>Point taken if it is in the decimal form but 0.1 inch is 1/10 of an inch
>and if you think of it as a fraction rather than a decimal, the fraction
>has got to be a more acurate measurment than a rounded decimal.

No, there is no difference between 0.1 inch and 1 1/10th of an inch. Both
are one digit of significance.

And 1.0 tenths and .010 inch would likewise be two digits of significance.

I would think this topic not worthy of discussion were it not for all the
bad drawings I have seen, and as we have heard in this thread, sometimes

Mr. Harland has pointed out in the past that the relation between mils and
mm in the Protel database should be founded on the exact relationship, and
he has discussed how to accomplish that. If the database were kept in the
proper units, a dimension could be converted back and forth between
imperial and metric without being changed. I think most of us have seen
objects that have a dimension of, for example, 1.5001 mm or something like
that, when they were originally entered as 1.5 mm exactly. That should not
happen. Among other things it can mess up our ability to globally select
objects based on dimensions.

[EMAIL PROTECTED]
Abdulrahman Lomax
P.O. Box 690
El Verano, CA 95433

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