Saturday, October 19, 2019

Tooth Tips

Accuracy of Profile, Lead, and Spacing

Noise The primary cause of gear noise is the number of teeth in the gear and the contact ratio of the given set. These are...

Modifications in Pre-Finished Gears

Profile: These modifications are made to accommodate the characteristics of the finishing process. (Figure 1a) Chamfer: The Chamfer is meant to protect the tip of...

Proper Spur and Helical Gear Inspection

In last month's Tooth Tips, we studied finished and pre-finished gears, along with their profiles. Let's move on to some more definitions useful in...

Principles of Gear Inspection

Over the next few editions of this column, I’d like to provide an understanding of the principles of gear inspection as they apply to...

Pitch and Pressure-Angle Changes

The engineer has the responsibility for the design of an involute gear set, and the tools that are used to cut the teeth in...

Using the Proper Computational Tool

As a practical matter, audible gear noise is subject to a tortuous path from the gear mesh to the ear. From a meshing gear...

All-Steel Hypoid Gears

In comparison, worm gear drives use softer, bronze gearing, which shortens service life, and they operate at efficiencies that decline as ratio increases. Hypoid-gearing...

Right-Angle Gearboxes Using Hypoid Gears

Still using a worm gear and trying to improve the overall efficiency of your system? Purchasing a high efficiency NEMA premium motor may improve...

Gear Accuracy Vs. Manufacturing Costs

The required gear accuracy is directly related to the costs of manufacture. The highest accuracy available by current processes is considered to be AGMA...

Pay Attention to the Teeth During Sequence of Operations

When the face width exceeds 24 inches, a minimum of three supporting ribs or webs is required. The rim thickness must provide full support...

Properly Designed Blanks

When a gear is produced by machining it must begin with a blank that is properly designed and produced in full accordance with the...

Cycloidal teeth must not only be accurately spaced and shaped; their wheel centers must...

In 1900, Wilfred Lewis discussed gear tooth forms at an ASME meeting: "About 30 years ago, when I first began to study the subject,...

The spiral tooth form, as with the helical gear, provides a smoother and higher...

An analogy can be drawn between a spur and helical gear and the straight and spiral bevel gear. The pitch surfaces and the conjugate...

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...
X