Pre-assembled Curta subassemblies (results dials and selector knobs)

thingiverse

Two procedures in assembling the Curta model seemed overly complicated and prone to errors. The screw that follows the selector shaft channel and protrudes through the selector knob is easily damaged when attempting to cut threads with the die, while the carry pins are vulnerable to damage when forced into tiny slots on the result dials. Both issues seem like components that could be manufactured as a single piece, eliminating the need for assembly. I therefore created some makeshift SCAD files to merge individual parts together. For accurate compilation, relevant files from contributing builds (the Curta calculator and debossed dials) are included in this archive. However, these files retain their respective copyrights and licenses. New files are prefixed with VARIANT. Assembled number rolls follow part-number and name conventions from original engineering diagrams (Type I + half carry = "Zahlenrolle I", part 10203; Type II + full carry = "Zahlenrolle IIa", part 10204; Type II + half carry = "Zahlenrolle IIb", part 10205). Variants are derived from both standard dials in the original Curta build and RestoredOlive's debossed dials, but type 2 debossed dials have caused issues due to a quirk in the original STL file.