Quite often you will hear a profession and wonder what does that person do? Well this was the same for "gear manufacturers", what did they do? Simply enough, as the name implies, gear manufacturers specialize in the manufacturing of custom gears, machined parts and assemblies. There are numerous companies all over the world that provide this service. It's huge and the need for gear manufacturers is as well. It seems to be one of those things that if you aren't aware of what it is or aren't in personal need of it you don't realize how big it is.
Literally manufacturers make many products. These are made generically as well specifically made to order as well. Some of the things a gear manufacturer will manufacture are precision ground gears, external/internal spur gears, helical gears, splines and serrations, sprockets and pulleys and crown gears. This is just to name a few and give an indication what a manufacturer does provide. So when you think about the things that were just mentioned it seems almost all machinery used today would rely on pieces supplied by a manufacturer.
This is for the most part true. Gear manufacturers provide product and service to almost every industry there is. Just to name a few, aerospace, aircraft, automotive, commercial, communications, defense and medical. Even the machines that are made to produce this gear for the manufacturers rely on product that they produce to be operational. This does well in giving a picture of how huge this industry in itself is. Gear manufacturing is huge and in big demand today as well.
You will also provide many local companies that will provide this service. You will need to look at the needs of your company and/or business and see what they are. Aside from places that provide this locally there is a huge selection of places on the internet that provide this service worldwide. It's a great place to check them out and see what they offer businesses like your own. They have the parts already made or almost all gear manufacturers will custom make orders as well. Their customer service can assist you in finding exactly what you may be looking for. They also may be able to provide advice and different options for you that may work. Either way checking the manufacturers out and seeing what they each offer is a great idea.