Nelson Precision Drilling can hone holes from .125” up to 20” in diameter in all materials, shapes and sizes. We can hold diameter tolerances to .0002” and generate surface finishes down to 4 Ra. We have honed tubes as long as 14’ in length. Nelson Precision Drilling has (3) automated horizontal honing centers, (3) automated vertical 2M2125A 2M2135A Deep Hole Honing Machine, CW-H Series Heavy Duty Horizontal Lathe Machine 20Tons Load, Double Column Vertical Lathe Cnc Deep Hole Drilling Machine - Manufacturers, Factory, Suppliers from China. We rely upon strategic thinking, constant modernisation in all segments, technological advances and of course upon our employees that directly participate in our success for Cnc Deep Hole Drilling Machine, China Drilling Bit, China Gundrill, Multifunction Cnc May 30, 2008 · May 2008 - Sunnen's new SV-310 vertical CNC honing systembines multi-spindle machine configurations with wide tooling choices and 762mm/30" stroke for bore sizing of small and medium-sized gas/diesel engine blocks, large gears, airpressors, aerospace parts, refrigerationpressors and similar small or large multi-bore parts.