Nov 10, 2016 | Processes
An introduction to the hard finishing of gears. In Part 1 of the Hard Finishing of Gears, we introduced the concept and a brief history of processes used to achieve non-hardened finished parts. Continuing, consider a gear that has been pre- or semi-finished, meaning...
Jun 22, 2016 | Processes
An introduction to the hard finishing of gears. Generally, many “hardened” gears in the United States before the 1970s were a through-hardened part, but this changed to contemporary case-hardening processes that were considered relatively new technology at the time....
Sep 29, 2015 | Processes
The benefits and use of automation during the hobbing process. For this discussion, we will categorize parts into three groups: large, medium, and small. Large parts above 400 mm (~16 in) are typically not automated. As a general rule, parts that are 200–400 mm (~8–16...
Dec 22, 2014 | Processes
Carbide rehobbing. Quieter, more compact gear boxes with improved power transmission remains an important goal for all gear manufacturers. One critical way to achieving these qualities is through the heat treatment and hardening of gears to the range of 50 to 62 Rc....
Oct 9, 2014 | Processes
A look at hobbing machines, hobs, and the hobbing process. In our last issue, we introduced basic information about hobbing machines and the hobbing process. A hob is a worm-like cutter that makes successive generating cuts to produce gear teeth. This is achieved by a...
Jul 8, 2014 | Processes
A look at hobbing machines, hobs, and the hobbing process. Hobbing machines provide gear manufacturers a fast and accurate method for cutting parts. This is because of the generating nature of this particular cutting process. Gear hobbing is not a form cutting...
