Columbia Machine Works was contracted to fabricate two 11′ diameter rings. These rings were burned out on our CNC plasma table out of two pieces of 2″ A36 plate, then welded at the seams with 100% joint penetration. They were then put on the boring mill to receive 40 equally-spaced, drilled and counterbored holes around the full diameter. Then we faced off the weld seams for clean-up, then inspected the rings for quality. Since we not only have a large CNC machine shop but also a sizable fabrication shop under the same roof, the work flow for these rings was very smooth.