Abstract
Reverse engineering was done on a direct injection piston compressing natural gas. Reverse engineering is a way to redesign a product to create a new product which has similar functions and improvement in the ability of the original product. The objectives of this research are to get the piston point cloud to be used in CAD three dimension modeling, to obtain the accuracy between existing designed pistons and reverse engineered designed piston, to calculate the accuracy of the prototype after CNC machining process. Piston was digitized using Advanced Topometric scanner (ATOS), a three dimension scanner to get the point cloud for usage in CAD three dimension modelling using Catia V5 R12 software. Accuracy tests were also done by manual calculation to determine the accuracy difference between reverse engineered piston and existing piston. To create the piston prototype, simulation of the piston was done using I-DEAS software and machining was done using CNC Robodrill alpha-T14iA machine. Simulation using I-DEAS software was used to find the suitable parameters to be used in the CNC machining process. The final prototype was measured for accuracy to determine the accuracy of the CNC machining process. It was calculated by manual calculation by comparing the dimensions of the actual prototype to the design dimensions on paper. The accuracy of the prototype was revealed to be 87.00% to 99,996% accurate to the desired dimensions except for angle and curve areas.