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Maid of the Mist
Regular Member
Joined: 19 May 2017
Posts: 20
Location: San Antonio Texas
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 Posted: Mon Sep 17, 2018 8:05 am Post subject: Mouthpiece Throat Alteration |
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Does anyone on the forum know which drill bit sizes (fractions of inches) correspond to two digit throat designations? Which bit size equals a 26 and which is a 25?
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mm55
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Joined: 01 Jul 2013
Posts: 1412
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| Posted: Mon Sep 17, 2018 8:18 am Post subject: |
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25 and 26 are drill bit gauge sizes, corresponding to 3.797 mm and 3.734 mm respectively. If you want to convert to other more quaint measurement systems, you're on your own.
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oxleyk
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Divitt Trumpets
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Joined: 11 Aug 2015
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Location: Toronto
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| Posted: Tue Sep 18, 2018 4:36 pm Post subject: |
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The drill set used is called a wire gauge drill set.
In the USA there are 3 main drill bit sets. Fractional, Letter, and Wire gauge.
Really, a wire gauge reamer should be used to ensure that the size is accurate. Drill bits are not terribly accurate, and if you need a hole to be perfectly accurate it is expected that you drill it and then ream to final dimension.
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