Compressive Stress on Crowned Splines 2

[redjesta]

I've just been working through the equation for the compressive stress on crowned spline teeth on p. 2174 of the Machinery's Handbook (29th Edition).

When you put the units in, the results come back as SQRT(psi).

Can this output be directly compared to the stress allowables in Table 11 on page 2172, or do you have to square the result to correct the units?

 

[israelkk]

How do you know that 2290 number is unitless?
This is why I do not trust cooked formulas where there is lack of information.

 

[redjesta]

Absolutely agree - there isn't any justification behind this number.

I'm wary of using the formulas in the machinery's handbook too but don't have any other references to go on for the design of splines. Could you recommend any?

 

[gearcutter]

Couplings And Joints (design, selection, application) - J. Mancuso (Marcel Dekker, 1995)

Flexible Couplings (their design, selection and use) – Michael M. Calistrat (Caroline Publishing, 1994)

 

[tbuelna]

Here is the original source of the analysis approach for crowned involute spline shown in Machinery's:

http://www.scribd.com/doc/217858249/When-Splines-Need-Stress-Control-Dudley#scribd

 

[gearcutter]

Wow!
Someone took the images that I uploaded to my Flickr account of that article by Dudley and are now charging people to view it..............go figure.

You can still download for free from my Flickr page -

https://www.flickr.com/photos/94603494@N06/albums/72157641276534515