The screen was usually made of a pleated or straight piece of heavy fabric, supported by crossed and sliding metallic supports.
2.
The upper extremity of the helix is fastened to a metallic support ( c ) and the lower extremity is connected to an index, which projects over a graduated circle ( b ).
3.
Metallic support structure removal and post processing of the part generated may be a time consuming process and require the use of machining, EDM and / or grinding machines having the same level of accuracy provided by the RP machine.
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