Model for 3D printing of a block instrument base with interlocking box, as used in standardized mechanical interlocking (type Einheit) on German and Polish railways. The model contains parts to build a base for 16 interlocking sliders and 12 interlocking (block) shafts.
Parts are optimized for 3D printing in FFF technique (fused PLA or PETG filament). Recommended basic parameters of the printout:
- layer height: 0.2 mm,
- infill density: 20% (e.g. grid fill pattern),
- selected parts may require printing with additional supports.
The model may require additional drilling patterns available as a separate download.
Attention!
Some parts might be slightly longer than a print area of typical 3D printer. In such case, parts can be rotated in the slicing software to be printed e.g. along the diagonal of the print area.
Longer parts may contract during printing (approx. 1 mm for 250 mm for PETG) – it is advised to print a test part, check the key dimensions with values provided in the manual and, if required, adjust the print size in the slicing software.
Based on:
- Album rysunków konstrukcyjnych urządzeń zabezpieczenia ruchu pociągów, vol. 2, Wydawnictwo Komunikacyjne, Warsaw 1961. Scans of the blueprints available at plany.zonk.pl (last access: 11th January 2025);
- Górecki, H.: Podręcznik montera ręcznych i elektromechanicznych urządzeń zabezpieczenia ruchu kolejowego, vol. 1 i 2, WKŁ, Warsaw 1967, 1969;
- Mikulski, A.: Mechaniczne urządzenia zabezpieczenia ruchu kolejowego, WKŁ, Warsaw 1965;
- Mikulski, A.: Mechaniczne urządzenia zabezpieczenia ruchu kolejowego, 4th edition, WKŁ, Warsaw 1979;
- Erläuterungen zu den Einheitszeichnungen für Stellwerksteile (STELL ERL), Deutsche Reichsbahn, F. Ullmann GmbH, Zwickau 1941 (collection by A. Zieliński);
- Einheitszeichnungen für Stellwerksteile, VES, Reichsbahn – Zentralamt, Berlin 1935 – 1943 (collection by P. Mierosławski);
- photos and measurements of interlocking from the collection of Polish Association of Railway Enthusiasts.