Rolling. The dimensions of each piece must be followed when
assembling the spiral and suction tube in order to shape each part
correspondingly, using a roller press (Fig. 10 and 11), and preferably
using templates as a guide. The templates need to be for each of the
two sections corresponding to each segment. These sections of the
spiral are circular in form up until section 13. From section 14 to section
21 they are elliptical. Section 23 is the transition section, and sections
23 and 24 correspond to the nose (see plan 01-2 in the set of plans). On
the suction tube the sections are indicated in plan number 04. As with
the spiral, each section of the suction tube requires either a cardboard
or tin template.
Figure 10: Portable roller press
Figure 11: Rolling process