Doublereed - 2008 02 000081

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Doublereed Archive - Posting 000081.txt from 2008/02

From: Dennis Thiel <dathiel@-----.au>
Subj: Re: [DR-L] Micrometer question
Date: Thu, 14 Feb 2008 18:20:55 -0500

Forgive the question, but I must ask this fundamental ... when their
anvils are lightly closed, are both micrometers absolutely zeroed? If
not, their sleeves may be rotated either way, using a supplied tool to
achieve zero. Otherwise, visit an engineering supplier and use them on
known thicknesses of feeler gauge. However, the closed test should be
proof enough. Zero is zero. Most unlikely their screw thread pitches
would differ over such a small dimension, no matter where they are made
or how cheap.

Dennis.
------------------------------------------------------------------------

David Lurie wrote:
> I own 2 different micrometers. When I measure gouged cane with the
> expensive Rieger, it shows a thickness of 0.6 mm. When I measure with
> the other one (a cheapie gift that a friend gave me) I get 0.50.
> Other thicknesses show a similar difference of about 0.10mm.
>
> So the question I have is which one is right? Also, how can I tell the
> accuracy of either? A friend suggested using feeler gauges.
>
> Any ideas, anyone?
>
> David
>
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