Software&Measurement kinematics. This higher level of verification, known as machine simulation, proves out machining strategies in a virtual five-axis environment that ensures part geometries, tools, fixtures and machine components will not interfere with each other during the cutting process. There are two varieties of machine simulation. The first takes the intermediate code (APT, NCI, CLS) generated by the CAM system prior to post-processing into G code for the machine’s control, and uses that code to drive a virtual replica of the specific five-axis machine. A small number of CAM developers have taken this approach, with some even refining it to the point where a separate, simplified stream of code is generated to drive the five-axis machine simulation process.
T h e s e c o n d , e v e n m o re meticulous approach drives a precise virtual replica via the G code generated by a CAM system’s post-processor. This program allows the user to choose from a variety of machine and control options and effectively simulates any G code language. The good news is that either of these approaches will accurately simulate machine behaviour if an accurate model of the machine has been created and the simulation program has been properly configured. Correctly configuring a virtual replica and the simulation process requires an in-depth knowledge of the specific five-axis machine, simulation software and postprocessor. Setting up an effective machine simulation program can be time consuming and expensive, but
it will protect a five-axis CNC machine investment and improve the manufacturing process. The alternative is to labouriously step through first-piece manufacturing operations sequentially at the machine, and wasting machine time and labour — unacceptable i n t o d a y ’s m a n u f a c t u r i n g environment. Simulation also provides a s a f e , re l a t i v e l y l o w - c o s t virtual environment for testing competing ‘what if’ scenarios, so simulation-derived, five-axis machining strategies can become a competitive advantage. For those who have purchased, or are about to purchase the fiveaxis CNC equipment, simulation is or will soon, become a core competency. It is not a question of if, but when. Enquiry No. 7201 Turn to page 80a or log on to www.equipment-news.com to enquire
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October 2013 asia pacific metalworking equipment news
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