Drawing
Ice bending
Expanding

Drawing

As in the bell formation process, in this step the inner diameter of a straight brass pipe is widened and constricted to obtain a roughly tapered pipe, which is then drawn through a template to achieve a precise taper.

Ice bending

Similar to the the stem body formation process, water is put in the drawn tapered pipe and frozen. The tapered pipe is then bent as it is pressed against a form.

Expanding

In this step a precision water-pressure mold is used to obtain the final shape.


Ice bending
Ball sizing

Ice bending

As in the tapered pipe formation process, water is put in the drawn straight pipe and frozen. The straight pipe is then bent as it is pressed against a form.

Ball sizing

In this step, a metal ball is passed through the pressing pipe to make the interior round and uniform.


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