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General Mach Discussion / Re: Mach 3 turn constant sfm?
« on: December 08, 2010, 09:41:53 PM »When I use this code CSS works fine meaning as the diameter decreases spindle speed increases. What is not working is the G95 or constant mm/rev feed rate. If I assign F=.2mm/rev this feed rate only takes place at the start of the cut when the RPM is still 1000RPM. As the RPM increases the feed rate in mm/rev decreases. Has anyone had experience with this behavior? My observation is that RPM x F(mm/rev) remains a constant value which suggests to me that the feed is remaing constant in mm/min and not in mm/rev as it should having set G95.
I ran into this a couple of days back. It seams as if mach had a mind of its own. The feeds were almost rapids. CSS still worked but the feeds were way off. It required restarting to solve the issue and then it did it again after a few passes. Good thing for me I was cutting air. I feel there is a bug. I haven't had any more time to test if it occurs only with CSS and feed per rev on the same program. Something tells me its gonna be a long time before it gets fixed if there is actually a bug.