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Smooth descent of milling bit

gstraccia
Mon, 31 Oct 2016 14:45:10 GMT

Hallo all! I've been using a conical milling bit tip diameter 0.1mm angle 20°, just after a few minutes the tip appeared bent. My spindle is a Kress running at 20000rpm. I've been thinking: a milling bit with a so tiny tip, should have an essentially low peripheral speed, what happen to it when the tip touches the copper descending vertically? Before penetrating the copper, the forces acting on it, might them be eccessive? Could be an improvement, to introduce some sort of climbing descent after the free movement of the milling bit? G.

jpcaram
Thu, 03 Nov 2016 17:31:17 GMT

Hi, I agree. I'm not familiar with the mechanics involved, but I will create a new issue for such a feature. In the meantime, I suggest you use a larger bit for the rough work and the 0.1mm one for finalizing the finer structures. This way you can make the tool reach cutting level at a location where there is no copper, therefore preventing vertical forces. JP