- Joined
- Dec 26, 2015
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- 2,155
As you move to smaller end mills, runout matters a LOT more. 0.001" for a 1/2" end mill is no big deal, but is enough to snap a 1/8" carbide end mill. So anything under 1/4" I mount in an ER32 R8 collet chuck and tap in the cutter to lower the runout to near zero. Watch this video starting at 10:35 in the timeline: