A two-spindle CNC internal grinder, the SNI features state-of-the-art Allen-Bradley drives and controls with customized software. Together with infinitely variable, high frequency Gamfor spindles, this arrangement provides process capability for grinding of bores (straight or taper), counterbores (with or without radii) and multiple faces. Positioning accuracies within .000004" are achieved via the Heidenhain glass scales. Rotational accuracy of .000050" or better is accomplished via a precision flange type spindle with anti-friction bearings. Rounding it off is a Micro-Centric workholding system capable of .0001 TIR maximum repeatability at 2,000 RPM.