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,...
Electric Discharge Method, Electro Chemical Machining, and laser and abrasive water jet machining among...
The Electric Discharge Method (EDM) is based on an electrically conductive material being eroded by a continuous spark discharge to its surface. Using special...
Research and development into nanotechnology and molecular engineering are resulting in gear types and...
The Bell Corporation identified five characteristics of what they termed the post-industrial society. They are: 1) the majority of the labor force is in...
Estimates say more than 30 basic forms have been produced, and this number continues...
Gear design and manufacture was simplified with the introduction of hobbing more than a century and a half ago. The hob’s cutting edge represented...
Steel weldments can meet requirements for rigidity and strength, while offering economies in weight...
Gears must have the rigidity and strength to resist a complex network of stresses. Steel weldments can meet these requirements and offer the designer...
Gear blanks are subject to numerous forces during the manufacturing process, all of which...
The universal demand for gears necessitates that they be produced in many geometric forms, numerous materials, and a wide range of quality levels that...
Conclusion: The growing use of powder metal in gear manufacturing, exploring the applications as...
Manufacturers are increasing the number of P/M gears in their designs thanks to new alloys and powder metal processing methods. Market expansion lies in...
Part 1: Powder metallurgy, in use since 3,000 B.C., gains additional prominence in gear manufacturing...
Powder metal technology is older than that of cast iron. Although the use of powder metals has been in existence since 3,000 B.C., and...
Wide variety of inspection techniques available depending on what you’re checking, checking for
Chemical etch inspection is a standardized procedure for the detection and classification of localized overheating on ground surfaces. Damage may commence with the partial...
What is the true definition of “surface finish” — and how can the extremes...
The term “surface texture” is used to describe the deviations from what is considered as a nominally perfectly smooth surface. The term can be...
Despite excellent design and manufacture, if a gear’s hardness doesn’t meet the requirements of...
Critical to a gear’s performance are the flank hardness its depth and the tooth’s core hardness. The tooth flank hardness can be defined as...
Depending on the material being tested, attributes and qualities to be determined, there are...
Material tests should be representative of the complete gear. For example, a test on a separately cast bar of the same material can differ...
Quality gears, other components are the product of many different factors. But it all...
Probably the most critical aspect of inspection is making sure the part has been produced as specified and is flawless. The detail of this...
Any gear manufacturer understands the need to inspect the end product, but there are...
The one essential requirement in the operation of every gear is reliability, and that can only be achieved with systematic inspection methods. Inspections confirm...
