The best results in terms of accuracy and quality of surface finish are obtained using contact RE systems. Contact systems have several fundamental advantages over noncontact systems: treatment of surfaces to prevent reflections is not required,

vertical faces can be accurately scanned, data density is not fixed and is automatically controlled by the shape of the component, time-consuming manual editing of the data to remove stray points is not required, postprocessing for cutting can be faster as surface offsetting may not be required, and very tiny detail can be accurately replicated.5
The contact systems' touch-trigger probes can be used to digitize components when fitted to either a CNC machine tool or coordinate measuring machine. Analog probes operate at very high scanning speeds, with excellent accuracy and low contact force. This allows better machine finishing of parts and the ability to scan relatively soft materials. The scanning probes have been developed for the intricate scanning of objects such as coins, watermark dies and jewelry, where fine detail requires the use of very low contact force.

  Once the data has been captured, the scanning software packages are used to produce mold and die cavities, CAM profiles and templates. Model variants can be produced by mirroring, scaling, rotating, translating and inverting. Once the scan manipulation is complete, the software enables the user to manipulate data and then create a CNC program or export the data to any of several CAD output file types.                    

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