Re: Bar Feeder Issue
hi benjamneanos i have also encountered this sporadic thing on a iemca : sometimes it works, sometimes it pushes too much
in the end, i have no longer used to stop the material on the cutting insert, simply because it was pushing it with too much force; this is hard to see, because the impact is very short, and if there is oil on the window, etc, it makes it even harder to spot this thing; to detect it, i have put a comparator dial inside the machine, and sometimes the shock would move the dial with a couple of tents ( 0.2 - 0.7 ; longer inserts tend to bend more ) ... so i decided that i have to remove this shock from the machine, or at least to avoid bumping my insert, so i have rewritten the code, to push not on the insert, but on a toolholder as a result, cutting insert would last much longer, and the cutting edge would remain sharp, getting wear only from cutting, not also from bumping
there is a parameter that controls the push force of the feeder : if you reduce it, it will have imediat effect but, on the long term, there may be problems :
... a longer bar needs more push force, and a shorter bar needs less push force, so, as the bar gets shorter, the shocks will increase, thus there will be much more pressure on the cutting insert when the bar is near it's end
... in time, the intermediate sleeve may get loose, and tightening it is not exact science, so is not quantificable how big is the fraction of the servo that must overcome the force of the intermediate sleeve
the strange thing is i have this program on 2 other identical machines and they run without this issue
even if code is identical, there are some variables :
... feeder torque
... bar length / mass
... intermediate sleeve friction, etc
kindly
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