Welcome to Involute Gear and Machine Company. In late 2009, Nachi Machining Technology Company (formerly known as National Broach & Machine) announced that it was ceasing the manufacturer of all gear hone tools. Involute Gear and Machine purchased all equipment, machines, supplies, materials, gages, and engineering drawings for the manufacturing of all types of Red Ring Hone Tools and Honing Compounds. Experienced in gear applications and gear inspection services. We can also recommend a repair shop and a gear repair process. Equipment includes: gear cutting hobs, gear cutting machine, gear cutting machines, honing tools, gear checkers, gear deburring machines, gear finishing equipment, gear hobbers, gear hobbing machines, Kashifuji gear hobs, gear hones, gear honing machine, gear inspection services, gear metrology service, gear checkers, gear measuring equipment, gear roll testers. Authorized Distributors: Kashifuji CNC Gear Hobbing Machines , Osaka Seimitsu Kikai CNC Gear Inspection Machines