These test results are sure to cause some controversy. Just six tools, so not an absolute conclusion.
The same 3/4" endmill, sticking out the same amount from six different toolholders (names are covered), machining slots in aluminum at the same feed rate (0.008 IPT or 10% of the worst measured runout) in the same CNC machining center. We measured the runout with a test indicator. Each tool assembly was tap-tested and then run at the maximum stable depth of cut and speed determined by each's unique stability lobe diagram. This was deemed a roughing cut, so the slot width accuracy and surface finish were not considered.
The productivity, as measured in metal remove rate (cubic inches per minute), did not correlate to the tool's concentricity or lack thereof. This reinforces the fact that the tool deflects at the first tooth impact with the workpiece and seems to imply that its dynamic characteristics (its vibration frequency + tooth impact frequency) may dominate its static ones.
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