Tool runout causes uneven chip loading on multi-flute cutters. One flute takes a thicker chip while the opposite flute takes a thinner one, accelerating wear on the overloaded...
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Request a Proposal →Tool runout causes uneven chip loading on multi-flute cutters. One flute takes a thicker chip while the opposite flute takes a thinner one, accelerating wear on the overloaded edge.
For carbide end mills under 12 mm, aim for runout below 10 µm TIR. Over 20 µm significantly shortens tool life and degrades surface finish. High-precision hydraulic or shrink-fit holders typically achieve under 5 µm.
With 10 µm runout, the heaviest-loaded tooth can see 20% higher chip thickness than average. This disproportionate load can reduce tool life by 30-50% compared to a perfectly centred tool.
No. You need a dial test indicator (0.001 mm resolution) mounted on a magnetic base. Measure TIR on the tool shank near the holder, then at the tool tip to separate holder error from tool error.
Measure the total indicator reading (TIR) at the tool tip with a dial indicator. Enter that runout value in microns and your programmed feed per tooth. The calculator shows average and maximum chip thickness to help you determine if runout is within acceptable limits.
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CHASING RUNOUT? Runout that survives a good holder usually traces back to the tool's own shank tolerance. See how shank and concentricity claims are verified.
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