Thursday, November 14, 2019

Tooth Tips

Tooth Tips: Andy Milburn, P.E.

A frequently asked question is "How good does the alignment have to be?" This column and the next will attempt to answer that question....

Tooth Tips: Gear Accuracy Charts Pt. 3

Pitch measurements determine the accuracy of the tooth locations around the gear. These measurements are typically made with either a single or double probe...

Tooth Tips: Gear Accuracy Charts Pt. 2

Gear Accuracy Charts -- Part 2 As noted in my last Tooth Tips column, AGMA has made significant changes in the accuracy classification system....

Tooth Tips: Andy Milburn, P.E.: Gear Accuracy Charts Pt. 1

Gear Accuracy Charts -- Part 1 Gear accuracy charts can be confusing the first time you see one, so this is the first of three...

Tooth Tips: Andy Milburn, P.E.

When failures occur, especially on a piece of critical equipment, the first priority is usually to get the equipment operating again. Unfortunately this can...

Tooth Tips: Andy Milburn, P.E.

Most mechanics are familiar with the concept of checking gear contact on bevel gear sets to ensure that they are set up correctly, but...

Tooth Tips: Donald R. McVittie P.E.

What load can you expect a gear set to carry? An accurate answer would be too complicated for this column, and while a simple...

Tooth Tips: Donald R. McVittie P.E.

Everyone knows that a pair of gears needs some backlash so that the teeth aren't "pinched" (running with both flanks touching). Many people, though,...

Tooth Tips: Donald R. McVittie P.E.

A favorite gear engineer's saying is "if the input shaft turns and the output shaft doesn't, the gear drive has failed." That "definition" implies...

Tooth Tips: Donald R. McVittie P.E.

Sometimes there simply is no easy fix for a misalignment problem. Maybe the box is bored out of line, the gears weren't matched originally,...

Tooth Tips: Donald R. McVittie P.E.

When gears are worn, they lose their accuracy. Like an engine camshaft, gears need a smooth, accurate shape to carry their load. When the...

Tooth Tips: Donald R. McVittie P.E.

Most gear tooth failures provide clues that help us make replacement gears that outlast the originals. Sometimes it's simple, like "no oil," but more...

Tooth Tips: Donald R. McVittie P.E.

Misalignment of an overhung pinion is easy to understand, but sometimes we see signs of misalignment even though the gear and the pinion are...

Tooth Tips: Donald R. McVittie P.E.

Here's a checklist for "walking around" inspections of operating gear drives. It's intended to help you keep track of the health of your drives...
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