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Siemen 828 versus 840


Feb 24, 2009
Midwestern MN/Wi USA
Boss asked a question I couldnt answer. He is looking at a 5 axis machines and the salesman asked him if he would like to upgrade to 840D siemens for 50k. Salesman states the 840D will allow full 5 axis contouring at high speed where as the 828 will not. I find no proof to this. And considering it is all CAM'd toolpaths and not using Sinumerick as the program builder is the 828 a good choice?
828D is only 4+1 control. Sales guy is right. The $50k I'm sure includes other necessary machine options to make it full 5 axis.