2.7. Manufacture of the seal
See plan 10 of the set of plans
A. Materials.
The main component is 90% brass (Cu 90% Zn 10%). This material is
used as a result of its high corrosion resistance, since these parts will be in
contact with water. Graphite tape will also be required. This can be bought
by the meter.
B. Method
The metal parts of the seal are manufactured in accordance with the
specified plans. First the models must be produced, before casting the
pieces, which are then finished off by machining in accordance with the
manufacturing plans.
2.8. Manufacture of the guide blades
See plans 01-4 and 01-5
A. Materials.
SAE 1020 quality cast steel. Grinding discs, files and fine and coarse
abrasive paper.
B. Method
The guide blades are cast, for which models must first be created. The
parts will be burred when they leave the foundry, and so will need grinding
down and finally polishing with files and abrasive paper, taking particular
care with the finishing process, as with the turbine blades, in order to
maintain the aerodynamic form. A separate structure has been produced
in order to fit them to the housing and make it easier to install the blades in
the correct position in accordance with the design angle. The blades are
welded to this structure.