There are four standardized AGMA systems of bevel gear tooth proportions: 20° straight bevel,...
In this month’s edition of Tooth Tips, let’s take a look at bevel gears at angles other than 90º.
When the sine of the angle...
The choice of straight bevel tooth forms limited to those forms that can be...
Continuing our discussion of bevel gears, let's take a look at the design of the straight bevel tooth. In Figure 1, it can be...
Accurate thickness, taper, gear blanks, proportions, other specifications necessary for maximum gear performance
Gear Blanks
Bevel gears are almost always produced from shaped blanks. Therefore, more care and attention has to be taken in the selection of the...
Bevel gears, pressure angles and their relationship
In this edition of “Tooth Tips,” I’d like to examine straight-tooth bevels, the oldest form of a true bevel gear. It is one of...
Exploring bevel gears and techniques for producing gears to exact specification
For some hundreds of years angled gearing has been used to transmit power between non-parallel shafts. In those olden days the power sources were...
Even environment and location are important to determine application stresses on gears
It was once a simple matter to select a gear reducer from a catalog. In order to allow for the application and the inaccuracy...
An increasing demand for minimal backlash has been created by the precision required for...
In the present day a precision reducer's backlash is typically three to six arc minutes, and on an eight-inch pitch diameter that is a...
When considering the gear mesh, backlash is high on the list of misunderstandings
Among the many considerations when considering the gear mesh, backlash is high on the list of misunderstandings. Backlash has a cyclically fluctuating value between...
Proper lubrication reduces frictional resistance and heat, improves the gear efficiency
Critical to a gear's operation is the lubrication type and method of application. Lubrication is a science and for new applications consulting with the...
Worm gear tooth forms, including the five standardized forms produced by milling or grinding...
There is a wide choice in tooth forms, each form with its own share of merits and demerits depending on the application. Several forms...
Requirements for more-intricate gear designs call for a knowledge of the best manufacturing processes...
The gear blank design is frequently influenced by the cost. The ideal blank is finished with the final bore perpendicular to the face and...
As gear requirements grow more intricate, a knowledge of the best processes for different...
The universal demand for gears necessitates that they be produced in many geometric forms, numerous materials, and in a wide range of quality levels...
Wrapping up a discussion of the different types of worm gears and the wide...
In the early part of the 1920s the automobile reached high production rates using rear axle drives with worm gear ratios of 4:1 and...
Part two of a discussion on the different types of worm gears and the...
This month we will discuss threads, effective length, and tooth thickness: The worm may be designed with any number of threads, or as they...
Part one of the different types of worm gears and how useful they are...
Principle: A machine’s practical mechanical advantage is defined as the ratio of the force expended by the machine to overcome a resistance to the...
Concluding the discussion of the history, applications, and attributes of different types of castings...
Continuing our conversation on different types of castings and related treatments, let’s turn our attention to bronze treatments. The heat treatment of a gear...
The casting process, Part 2: Die casting, vacuum casting, and the various properties of...
Die casting is a large production method for castings that weigh less than 100 pounds. The two most popular methods are gravity-die and pressure-die....
Hobs and hobbing, Part 3: The results of research into materials and processes that...
Hobs have continued to develop over the last 150 years, but it was not until the 1980s that major advances in design and materials...
Part 2 of an outline of the evolution and continued development of hobs
Tangential feed hobs are in three basic designs: pancake, multiple-spiral cylindrical, and pineapple. The former are low in cost with a narrow face and...
Hobs have developed over the 150 years, but it was in the 1980s that...
An essential part of the gear art is in selecting the correct hob for the required gear. The hob diameter, length, number of gashes,...
