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Measuring Mouthpieces Internally

Author: JTJC
Date: 2026-09-11 18:08

Can people say which tools they find best for this?

If the interior could be moulded, it would make measuring much easier. Provided the substance used allowed the requisite level of accuracy when measured. Has anyone tried this, and if so which substance did they use.

Thanks

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Re: Measuring Mouthpieces Internally

Author: Mojo
Date: 2026-09-11 18:43
Attachment: IMG_5469.jpeg (925k)

Telescopic bore gauges and calipers do many internal measurements well. 2-part silicon can be used to mold a core you can pull out. Need to coat the inside with a release agent like petroleum jelly.

MojoMP.com
Mojo Mouthpiece Work LLC
MojoMouthpieceWork@yahoo.com

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Re: Measuring Mouthpieces Internally

Author: stevesklar
Date: 2026-09-15 21:57

as Mojo stated, the mold is the best method.

I show in a recent YT video measuring the throats of a few sax mpcs, AirFlow, S80 and Soloist with an inside caliper, if I recall correctly. As simple as it gets for measuring.

==========
Stephen Sklar
My YouTube Channel of Clarinet Information

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Re: Measuring Mouthpieces Internally

Author: JTJC
Date: 2026-09-17 01:23

Mojo and Stevesklar, thanks for the info.

Moulding the internals seems simplest. However, that seems to require using an appropriate material. It needs to fill all crevices of the chamber, flexible enough to remove yet firm enough to measure accurately. A mould also means the same caliper can be used for all measurements. As I'd be doing clarinet mouthpieces, the latitude for error is less than for larger mouthpieces like saxaphone.

Stevsklar, you mention calculating the volume ofva mouthpiece. I've heard that the internal volume of mouthpieces can be assessed by blocking off the lay and filling it with water and measuring the liquid. By doing this several times, collecting and measuring the total liquid and dividing by the number of times, the average volume provides a more accurate figure. I've never tried it, but there might well be issue measuring the liquid accurately.

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