The process for calibration is the same as for oboe (see video), except that the Gauge Block for Bassoon Radius Dial Indicator is 25 mm in diameter.
Figure Machine
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General Comments
The purpose of this radius dial indicator is to determine the diameter of your cane for bassoon, historical bassoon, contrabassoon, clarinet, and pipe precisely and quickly. This allows you to sort through cane and find pieces which match your needs, or the diameter of your Gouging Machine. Suitable for diameters from 15 to 38 mm.
A precise pre-selection and determination of the cane diameter is an important prerequisite for repeatable good gouging results.
Using the Radius Dial Indicator
To use the Radius Dial Indicator, simply place the piece of cane you wish to measure in the cane receiver and press down. The dial will show the diameter of the piece of cane you are measuring.
The Radius Dial Indicator can also be used on tube cane to find the ideal part of the cane to use. Press the tube cane against the cane receiver and rotate the tube cane. Once you have found the section of cane with the diameter you desire you can now mark the cane, knowing that the section of cane closest to the dial is the section with the shown diameter.