CNC Live Centers

A live center's bearing assembly lets the point spin with the part instead of dragging against it, cutting down friction at the contact point compared to a fixed dead center. Reducing deflection and vibration at the tailstock keeps dimensional accuracy and concentricity consistent across a production run, and TIR (total indicated runout) is the standard measure of how tightly a given center holds that accuracy. Running above a center's rated RPM or load capacity is the main way heat builds up at the point and shortens bearing life, so matching load rating and max RPM to the job matters as much as picking the right point style. Live centers also come in multiple bearing and point configurations, from spring-type to quad-bearing, to match different workpiece geometries and hold the workpiece steady against chatter during heavy cuts.