Spindle The spindle is supported by 4 pieces of class 7 (p4) super precision angular contact ball bearings and directly coupled with low vibration class v3 spindle motor. Air purged spindle available upon request. Base an......Spindle The spindle is supported by 4 pieces of class 7 (p4) super precision angular contact ball bearings and directly coupled with low vibration class v3 spindle motor. Air purged spindle available upon request. Base and saddle Specially designed one-piece T-shaped base casting offers superior rigidity. Hand-scraped, Turcite-B Coated crossfeed guideways between base and saddle have double "V" design provides support for full table travel and prevents table overhangs.