Four double angle contact bearings.
Two bearings to handle the end load /thrust from drilling.
Two Double angle contact bearings at the spindle nose and two Ball bearings at the top end of the spindle.
This means there is only one bearing to handle the end load /thrust from drilling
-constant complains about wearing out
The largest complaint among our competitor was concerning accuracy is Squareness. This one is at 41% of the top 5 issues. Circularity is .0010”