Abstract of

GFPDI  System Manual


GITA Flat Pattern Development (GFPD) is a resultant of automating one of the activities of Sheet Metal Components (SMC) manufacturing. The need for indigeneous FPD activity was felt since the existing packages CAFPAD/CIFPAC are to be replaced due to the phasing out of CADDS4X/CADDS5.


ADA's CAD tool G1TA was considered as a candidate for developing FPD software. Suitability of GITA for this objective was examined through the development of sample soflwure modules as a pilot study. CAD capabilities were also probed. For expediting the FP development without concurrent development speed in CAD augmentation parallel process of IGES route for model imports were utilized. A number of GlTA functions (56) were utilized and some of them were modified to suit the needs of GFPD. Additional functions / routines totaling 200 have been successfully developed and a few more are contemplated.


GFPD is developed over GIT A CAD. utilizing SDK lools and 'C' language in Windows environment. GUI is designed such lhal it is user friendly. Still. certain aspects of GUI have to be redesigned to minimize user interaction time.


Overall system is. designed with an intent. to improvise on the scope of earlier CAFPAD/CIFPAC systems. A simple but effective additional development process of a FPD module is' included here utilizing ana1ytical methods for regular geometric shapes.


GFPD system is designed such that the USER can work in Automatic, Semi-automatic and Interactive modes of FP development. Additional features such auto-mould line generation, auto joggle recognition, douhle joggle processing, application of joggle pull allowance, special processing for convex-/concave flanges etc. are 3dded to the system. Pioneering effort related to FP development of specific aircraft component geometry features like axi-symmetry, apex edge processor and edge processor carried out earlier in CIFPAC have now been implemented completely in GFPD. These are being tested to ensure that they are suitable.


A host of post processing facilities envisaged in earlier systems are also included in GFPD. Suitable acceptance test plans are developed and utilized for the preparation of test reports.


It is good beginning for the indigenisation of FPD activities.





Abstract of

GFPDI  User Manual



This document comprises of eleven chapters, provides an introduction to the use of GITA FLAT PATTERN DEVELOPMENT (GFPD) SOFTWARE, which could be utilized for the Flat Pattern Development of Sheet Metal Components. This software has been designed to handle simple, medium and complex aircraft components. It runs on PC in WINDOWS environment.


The First section of the document provides an introduction to the software and the CAD package on which the software has been built.


Second section gives an overview of the surface geometries, which could be either directly modeled in GIT A environment or brought onto this through translators. It also contains the nomenclatures of the terminologies.


The next three sections contain tools and software language used for developing GFPD package. It also provides an insight into the highly us~ friendly Graphical User Interface. The preprocessing required for the model before ~tarting the process of development, also has been illustrated.


Sixth section brings out the basic definitions of material and geometric parameters required to be supplied by the user for the development process.


The seventh section contains the model preprocessing routines, which are part of FP development.


Eighth section illustrates the Analytical development of some regular geometric shapes along with the FP to understand the features.


The ninth section provides the step-by-step development of the component using different methods of FP process in automatic mode. It also gives the allowances required for the geometry automatically and also some of the checks required before processing any model.


The last two sections summarizes the steps required for post processing features, which are an integral part of FLAT PATTERN. It provides insight into complex processes like Edge Process and FP development of Apex Edge components.