For many of us, 2016 was a rough year - and the results of our annual State of the Gear Industry Survey show it. 40% of respondents indicated their companies
had cut staff, while only 27% indicated an increase in employment. Clearly, there have been widespread cutbacks.
Oil-out conditions, or conditions
in which an aircraft is
operating without any oil in its
gearbox or transmission, are
devastating for an aircraft's
hardware. Even the sturdiest gears
usually can't last 30 minutes under such
conditions before they catastrophically
fail, and the whole system usually follows shortly after. That doesn't leave pilots with a whole lot of time to find a suitable location to land in the case of an oil-out emergency.
It's the New Year, and with it
comes the opportunity to take
a fresh look at your business
objectives. Because business development
is such a vital part of running a
company, I'd like to present some guidelines I have found beneficial for securing new work and new customers.
Multiple possibilities are available to increase the transmissible power of girth gears. These solutions include: using a larger module, increasing of the gear diameter through the number of teeth, enlarging the face width, and increasing the hardness of the base material. The first three parameters are mostly limited by cutting machine capability. Module, outside diameter, and face width (for a cast gear) can theoretically be increased to infinity, but not the cutting machine dimensions. There are also practical limits with respect to the installation of very large diameter/large face width gears.
This paper presents a new approach to repair industrial gears by showing a case study where pressure angle modification is also considered, differently from the past repairing procedures that dealt only with the modification of the profile shift
coefficient. A computer program has been developed to automatically determine the repair alternatives under two goals: minimize the stock removal or maximize gear tooth strength.
When I first met the leaders of
the gearing industry in April 2016
at AGMA's 100th Anniversary
Celebration, I did my best imitation
of Joe Namath, who famously
predicted a Super Bowl victory for
his New York Jets: I guaranteed we
would reach our 101st year!
If you've got a gear performance problem, the Gear Research Institute (GRI) is here to help you. Since inception in 1982, GRI has been a primarily industry sponsored, experimentation driven research facility. Whether establishing the fatigue life of gears or evaluating
the impact of manufacturing processes
on the performance of gears, GRI
has pioneered methods and procedures
for characterizing such properties that
are accepted by the aerospace, vehicle
and other industry sectors.
What is the best tooling to use when hard milling a gear tooth on a 5-axis machining center? And what makes it the best? We have just bought a DMG Mori mono-block and are not getting the finishes at the cycle times we require.