Tooth Tips: William Crosher
Over the past 100 years there has been a remarkable improvement in gear capacities. This increase in the density of a power transmission unit...
Tooth Tips: William Crosher
Bronze Bronze Forgings and Castings
Gear bronzes are designated according to their major alloying element. Only the aluminum and beryllium copper bronzes can improve their...
Tooth Tips: William Crosher
Popular practice is to mill the worm, heat treat, finish grind and, for best results, polish. Material for the worm requires a hard, smooth...
Tooth Tips: William Crosher
The first scale for comparing the hardness of materials was devised by the German mineralogist Friedrich Mohs in 1820. The scale is based on...
Tooth Tips: William Crosher
Continuing our conversation from the May issue, “Sigma” is a statistical measure of standard deviation. It is accomplished by a manufacturer’s close coordination with...
Tooth Tips: William Crosher
The gear industry faces a constant challenge in keeping abreast of regulations, standards, and customer requirements. Governments around the globe impose regulations, and our...
Tooth Tips: William Crosher
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...
Tooth Tips: William Crosher
Among the many considerations when considering the gear mesh, backlash is high on the list of misunderstandings. Backlash has a cyclically fluctuating value between...
Tooth Tips: Nick Sudzum
After a replacement set of gears have been properly manufactured and thoroughly inspected in a tester to insure that the proper contact pattern has...
Tooth Tips: Nick Sudzum
My last column covered the basics of the reverse/inverse engineering process, which is only the tip of the iceberg. Let's assume that everything went...
Tooth Tips: Nick Sudzum
Regardless of type or style, when bevel gears need to be replaced and manufacturing drawings are no longer available, your gear can still be...
Tooth Tips: Nick Sudzum
Bevel gears are predominantly manufactured using low carbon alloy materials and then carburized and hardened, or case hardened, with an effective case depth of...
Tooth Tips: Nick Sudzum
As described in last month's column, gear tooth problems are usually recognized at higher frequencies with exact multiples from your readings on your gearbox....
Tooth Tips: Nick Sudzum
Vibration can be defined as the repetitive periodic motion of a machine and/or its components such as gear trains, gear drives, gear boxes, drive...
Tooth Tips: Andy Milburn, P.E.
Just as a doctor uses blood tests to monitor our health, oil analysis can be a powerful tool to monitor the condition of both...
Tooth Tips: Andy Milburn, P.E.
This months' installment is the second of three on gearbox lubrication. This column will cover issues related to the selection of gear and bearing...
Tooth Tips: Andy Milburn, P.E.
Proper lubrication of gears and bearings is essential to their operation and to achieving long life. It is a very complicated subject, and an...
Tooth Tips: Andy Milburn, P.E.
The parameters that usually have to be examined are bearing deflections, shaft deflections, pinion torsional windup, housing deflections, and external forces on the input...
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...
