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G E O 7

Design of Internal Geneva Drives

(C) Copyright 2018-2024 by HEXAGON Software, Berlin

Calculation and Design of Geneva mechanism

GEO7 calculates dimensions, operation angle, velocity and acceleration of internal Geneva drives. GEO7 generates drawings of Maltese wheel and driving crank as DXF or IGES files to be used with your CAD software. The component parts can be generated as STL files, then printed on a 3D printer and assembled as functioning model of a Geneva mechanism.


Number of slots in the Maltese wheel may be 4, but also any number between 3 and 100.

Size of the Geneva mechanism can be defined either by crank length or by center distance between crank and Maltese wheel. Then enter width of slots and driving crank diameter. Dimensions of arc segments used as locking device are calculated by GEO7, just enter minimum wall thickness and clearance between arc segments of Maltese wheel and driving wheel.


Angle of rotation of the Maltese wheel as function of the driving crank as well as velocity and acceleration over one revolution can be shown as diagram.


Rotation of Maltese wheel and driving crank can be simulated on screen as animation.

Text Output

Input data and calculation results may be printed, saved as text file or HTML file, or exported to MS Excel via OLE interface.

Graphics Output

Drawings and diagrams can be printed on any Windows printer, or exported to CAD.

CAD Interface

Drawing of Maltese wheel, driving crank, diagrams and tables can be exported as DXF- or IGES files, and opened in CAD. Layers, colours and text font can be configured in GEO7.

STL Interface

Maltese cross wheel, driving crank, bearing plate and spacer sleeve can be generated as STL file and produced with 3D printer. This way you can assemble a Geneva mechanism with the printed parts, just to be completed with metal bolt and shafts.

HEXAGON Help System

GEO7 provides help text and auxiliary images. Warnings and error messages occur if exceeding a limit. For every error message you can have a description and remedy suggestion.


Units can be switched between metric (mm) and imperial (inches).

System Requirements

GEO7 is available as 32-bit app or as 64-bit app for Windows 11, 10, 8, 7.

Scope of Delivery

Program with example applications and help images, user manual (pdf), license agreement for an indefinite period of time


HEXAGON gives a 24 month guarantee on full functionality of the software. We provide help and support by email and hotline without extra charge.

GEO7 is constantly being improved and updated. Registered users will be informed about news, and can get new versions at a reasonable update price.

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