Re: [CAD_CAM_EDM_DRO] Conversion

Terry,

The correct metric to imperial conversion is 1 inch is EXACTLY
25.4000000000000 mm. This is not a rounded off number and has a
theoretically infinite number of significant digits. The 1.609 km per mile
has only 4 sig-fig and is an approximation which is why it changes depending
on the precision to which the source reports this value. Use 25.4 mm per
inch as the exact value and you cannot go wrong.

Finally something I know about to respond to on this list, ;-).

Daniel J. Statman, Statman Designs
www.statmandesigns.com

----- Original Message -----
From: "James Owens" <wotisname@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, June 21, 2002 6:45 AM
Subject: [CAD_CAM_EDM_DRO] Conversion


> Hi,
>
> I'm working on a DRO and am having some confusion over the conversion of
> metric units to inches and back again. The device should be able to read
> glass scales down to 0.001mm or 1 micron so it is important to get this
> right.
>
> I have always used 1" = 25.4 mm but on trying to work it out with a little
> more accuracy I find that an English mile = 1.609 kilometres or 1" =
> 25.39457071 mm. but this figure changes depending on who it is coming
from.
>
> Does the list have any opinions on this.
>
> Regards,
>
> Terry
>
>
>
>
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