Hi Stuart
as you correctly point out resolution and accuracy are not the same thing. Digital devices in particular even if they were 100% accurate can only resolve to the smallest digit they can display and you have no way of knowing if the displayed 0.0005 is 0.0005,6,7,8 or 9 before it gets to the next 0.001
In a well made and marked mechanical gauge you can interpolate the position of the pointer between markings
Gerry W
Leeds UK
To: 7x12minilathe@yahoogroups.com
From: 7x12minilathe@yahoogroups.com
Date: Thu, 28 May 2015 10:52:35 +0100
Subject: Re: [7x12minilathe] End of my "test" of digital calipers
as you correctly point out resolution and accuracy are not the same thing. Digital devices in particular even if they were 100% accurate can only resolve to the smallest digit they can display and you have no way of knowing if the displayed 0.0005 is 0.0005,6,7,8 or 9 before it gets to the next 0.001
In a well made and marked mechanical gauge you can interpolate the position of the pointer between markings
Gerry W
Leeds UK
To: 7x12minilathe@yahoogroups.com
From: 7x12minilathe@yahoogroups.com
Date: Thu, 28 May 2015 10:52:35 +0100
Subject: Re: [7x12minilathe] End of my "test" of digital calipers
In article
<CAAv567yETsicQbwiVYhKsM=s2jg5CNGy6YVScR3ZbA194M8J9Q@mail.gmail.com>,
Mike T mctaglieri@gmail.com [7x12minilathe]
<7x12minilathe@yahoogroups.com> wrote:
> These calipers are also usefully more precise, reading to .0005" instead
> of .001"
Don't be fooled by the apparant resolution though, it doesn't mean they
are any more accurate.
Even Mitutoyo, who's digimatic calipers read to 0.01mm, only claim an
accuracy of +/-0.02mm
http://www.mitutoyo.co.uk/small-tool-instruments-and-data-management/calipers/573-734
--
Stuart
http://www.torrens.org.uk/ZFC/gallery/winsor.html
<CAAv567yETsicQbwiVYhKsM=s2jg5CNGy6YVScR3ZbA194M8J9Q@mail.gmail.com>,
Mike T mctaglieri@gmail.com [7x12minilathe]
<7x12minilathe@yahoogroups.com> wrote:
> These calipers are also usefully more precise, reading to .0005" instead
> of .001"
Don't be fooled by the apparant resolution though, it doesn't mean they
are any more accurate.
Even Mitutoyo, who's digimatic calipers read to 0.01mm, only claim an
accuracy of +/-0.02mm
http://www.mitutoyo.co.uk/small-tool-instruments-and-data-management/calipers/573-734
--
Stuart
http://www.torrens.org.uk/ZFC/gallery/winsor.html
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Posted by: gerry waclawiak <gerrywac@hotmail.co.uk>
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