A very good break-down, with explanation, of this transmission - https://youtu.be/dqM3YXEf1js
Check out the other videos on the guy's channel, well worth the effort.
Interesting summary of a yet-to-be-released report into the cause of an engine shut-down on an A330 while flying over Australia.
http://www.atsb.gov.au/publications/investigation_reports/2016/aair/ao-2016-101/
So far it appears like there's been an oil pump failure due to damage sustained to...
Here's an interesting problem that a gear cutter is sometimes faced with.
I'm doing a job which requires the use of a 13 module, 20deg PA hob.
Material is 4140 H/T to around 35-38HRC.
The type of material and the hardness is causing wear issues with the High Speed Steel hob.
Therefore I'd like...
Interesting gear profile on these gears, apparently part of the mechanism used to drive the steering system of the Olympic-Class liners such as the RMS Titanic.
I'm not sure what the profile would be called. Double Herringbone perhaps?
This reference refers to the gears as 'Wilson-Pirrie'...
Here's an interesting failure of a small splined shaft that I'm currently investigating.
The Engineer's (hired by the OEM) final report simply stated that the incorrect material and heat treatment had been used.
The end-user has asked for a more detailed report along with recommendations...
With help from Bob Errichello, these guys have put together an excellent on-line resource on gear failure modes & mechanisms.
http://gearboxfailure.com/
Fellows Gear Shaper ad from the early 1900s.
Talk about an offer-you-can't-refuse!
"Now we know just what this machine will do.
Unless you have used one, you don't.
We will tell you.
Send us drawings of your gears and we will make you a positive guarantee.
Then we will put a Gear Shaper into...
In case you've ever wondered what it might be like to have to design gears for this most-unique of operating environments, here's an interesting paper from the NASA archives.
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19750002094.pdf
Below is a link to a really neat little .exe file that'll calculate dimensions over pins/balls for gears, racks, worms, serrations & threads.
Developed by a guy in Germany by the name of Emil Meyer; the program used to be available for download for free-of-charge from his website.
Unfortunately...
In case you've ever wondered how a gear generating hob is 'backed-off' or 'form-relieved'; this video shows how it's done in a form-relieving lathe.
http://youtu.be/P91Wt4CwH4A
I'm in the middle of an investigation and thought I might share some of the issues that I'm coming across.
This image is the best example that I have which shows an adhesion phenomenon known as scuffing, sometimes incorrectly called scoring.
Shown is a tooth tip and a metric ruler for scale...
Spiral gashing a cone/pineapple/tapered gear cutting hob 'old school' with a double angle side & face cutter.
Cone hobs are generally used for generating teeth on worm gears by feeding the hob tangentially through the pitch circle.
Cone hob by ronvol, on Flickr
Ron Volmershausen
Brunkerville...
The AGMA has just released several new and updated standards.
The main one of interest is ANSI/AGMA 1010-F14 which is a revision of 1010-E95 'Appearance of Gear Teeth = Terminology of Wear & Failure'.
There are many excellent examples of the various failure modes that gear teeth are subjected...
The images below were taken from another gear related forum.
They are of a machine located at a gear shop in India somewhere.
A conventional milling machine is being used to do the job of a horizontal hobbing machine. Power is taken from the rear end of the horizontal tool spindle and then...
Occasionally there's discussion about winch drums in the forum so I thought this video might be of interest to the members.
The accident happened in Australia, 2008.
Watch in the lower right hand corner as the hoist mechanism of the M4600-based Transilift appears to explode as the operator tries...
Excellent article from Gear Technology magazine about predicting & modelling the load distribution of involute spline couplings.
http://www.geartechnology.com/issues/0610x/chase.pdf
Ron Volmershausen
Brunkerville Engineering
Newcastle Australia
http://www.aussieweb.com.au/email.aspx?id=1194181
Interesting video showing a 'ball screw' type worm & worm wheel drive.
I wonder what sort of loses there'd be and how smooth the engagement would be.
http://youtu.be/hvz9A0c_HeQ
Ron Volmershausen
Brunkerville Engineering
Newcastle Australia
http://www.aussieweb.com.au/email.aspx?id=1194181
Here's a link to another excellent thesis on the fretting fatigue phenomenon in splined couplings.
The work was conducted from an aerospace perspective.
REPRESENTATIVE FRETTING FATIGUE TESTING AND PREDICTION FOR SPLINED COUPLINGS.
By DEAN HOUGHTON, BEng, University of Nottingham...
Here's a link to a thesis from 2006 on the fretting phenomenon in aerospace applications.
The work concentrates on spline type applications using materials which have been case hardened using a nitriding process.
An excellent source of information for spline design, lubrication, material and...
