Posts From Charles D. Schultz

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Gear Talk With Chuck

Moderation Instead of Modification

Few designers would feel comfortable with a face to pinion pitch diameter ratio of 2.00 anymore. Some still prefer to select face width by face contact ratios, often aiming for

Gear Talk With Chuck

What About Face Width?

The second component in that face contact ratio equation is the face width. There are almost as many “rules of thumb” for determining the “proper” face width as there are

Gear Talk With Chuck

In Search of True Helical Action

I was trained in the cult of the integer face contact ratio. A few adherents to this belief are still above ground, but the introduction of personal computers has made

Gear Talk With Chuck

How Much Helix Angle?

The most obvious difference between a spur gear and a helical gear is the presence of that “helix” angle. Civilians will call them “straight-cut” and “crooked-cut” — like those are

Gear Talk With Chuck

Back to Basics: Helical Gears

Most of the gearboxes I have been involved with use single helical gears. Its excellent power capacity per mesh makes it the default system for many designers. Every aspect of

Gear Talk With Chuck

Filling in the Gaps

A few weeks ago, I admitted to not knowing much about the Klingelnberg system of bevels. Terry Edwards, chief designer at Pacific Star Marine in British Columbia, was kind enough

Gear Talk With Chuck

Worm Basics – Part 2

Continuing our discussion of the “least you need to know” about worm gearing: 5. Efficiency is highly variable for worms. If it is critical to your application, you have to

Gear Talk With Chuck

Minimal Worm Expertise

Worm gearing has long been a big part of the mechanical world. If you work in the gear trade, “civilians” will rightly expect you to know things about it. Very

Gear Talk With Chuck

What About Worms?

It is difficult to know where to start when writing about worm gears, because this market segment has defied “standardization” within the United States. The rest of the world has

Gear Talk With Chuck

Bevel Buzzwords

Does technical lingo confuse you? If so, welcome to the bevel gear sector and its special kind of hell. The same “system” that benefited from standard geometry books for “straight”