The Long and Short of It

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Gear Talk With Chuck

The Long and Short of It

One of the problems with “tribal knowledge” is that the terminology can confuse those who are not fully immersed in that community. I have lost count of the number of

Gear Talk With Chuck

Hunting for a Solution

Most of you are excused for missing the attempted humor in the above headline. So, I will violate the first rule of comedy and explain the joke. And like most

Gear Talk With Chuck

How Many Teeth Do You Want?

Designing gears is somewhat of a mathematical puzzle. You have lots of interconnected factors to play with in hopes of finding the “best” overall solution to the problem. Among the

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