Saturday, November 17, 2018

Tooth Tips

Dealing with Parts Rejection

You got the call or the email, or maybe the box just showed up. One of your customers rejected some parts. The box winds...

Executing a Quality Product

As a former owner of a mid-sized gear manufacturing facility, I understand the pressures that owners and their staffs endure to satisfy their customers....

Preliminary Results of Testing of Low-Tooth-Count Bevel Gears of a Novel Design, Part III

For the manufacturing purpose, a simplified approach can be used for the development of the CAD models of the gear and the pinion in...

Preliminary Results of Testing of Low-Tooth-Count Bevel Gears of a Novel Design, Part II

In the proposed approach, the tooth flanks of the gear, G, and the pinion, P, are generated by means of a desirable line of...

Preliminary Results of Testing of Low-Tooth-Count Bevel Gears of a Novel Design, Part I

In a general sense, LTC bevel gears feature the start-of-active-profile cone angle, ϒl, smaller than the base cone angle, ϒb, of the gear.  For...

Tool Coatings and Dry Cutting

There has been a movement in recent years to dispense with the use of coolants in gear cutting. This has been normal practice in...

The Pressed Blank: A Closer Look

Carbide Carbide is the basis for most cutting tools used today in non-gear cutting applications. It has been in use approximately 50 years. It cannot...

High-Speed Steel

To be effective in cutting a gear, a cutting tool material must have a combination of the following qualities: • Durability: The ability to withstand—to...

Controlling Profile, Lead, and Spacing

This column marks the end of a three-part discussion on control of the three basic elements: profile, lead, and spacing. Figure 1 depicts three...

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...
X