I am working on Micro milling of Titanium alloy. I would like to know what percentage of tool edge radius (micron) should be selected for Feed (micron/tooth)?
If Tool edge radius is 3 microns then what could be the maximum and minimum feed (micron/tooth)?
In John Schey's textbook: Introduction to Manufacturing Processes, 3 rd edition, page 644 you will find the relationship between the feed and the tool nose radius. It is Average surface roughness = (feed)^2 / 32 R. Assuming that in your case the average surface roughness is 1.5 microns, for R=3 microns, feed works out to 12 microns. Hope this helps.
According to Saedon, Soo, Aspinwall, Barnacle and Saad (2012), for micromilling of hardened steel, using a 5-7 microns tool edge radius, the feed per tooth could be about 1.5 to 2 microns.
A principal rule for machining is that the feed per tooth may be higher than tool edge radius with the object to minimize the influence of tool radius.
In this sense I agree with Malur´s coment.
In cutting process a very important phenomenon is the minimum thickness of cut layer. It is a subsidiary of the radius of the cutting edge of the blade. It is assumed that it is around 0.1 radius. This can be applied to the feed but for the cutting angle of 90 degree edge. Thickness of cutting layer varies on the radius of the corner. It was presents in my paper "Modeling of Minimal Thickness Cutting layer Influence on Surface Roughness in Turning"
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