Older machine designs can be given new life by retrofitting new motion control systems. Such is the case for Sunnen Products Co., St. Louis, and its latest generation of heavy-duty tube honing system, the HTG. Honing is done on the inner walls of oil drilling pipe, hydraulic cylinders, nuclear fuel rods, and other pipe segments to achieve a precision size while reducing metallurgical stress and creating a cross-hatched surface finish.
The HTG machine can hone tubes from 2 to 24 in. in