Rush Gears published a complete design guide that identifies 120,000 pre-engineered English and Western metric gears, gear formulas, horsepower formulas, and hardness conversion charts. Also included is dimensional formulas for spur, helical, worm and bevel gears. The guide is designed to be a tool for designing new machinery or identifying existing parts. The guide is available in a hardcopy version or online and includes online horsepower and ratio-center distance calculators and can be found on the company’s website. Rush Gears offers services related to spur gears, helical gears, worm gears, gear racks, internal gears, bevel and miter gears, spiral bevels, pinion shafts, timing pulleys, sprockets, couplings, involute splines (internal and external), special tooth forms and reverse engineering.