concavity of tooth profiles 1

[mfgenggear]

Question?

which if any, AGMA specification addresses concavity requirements
of gear tooth involute profiles?

Thanks

Mfgenggear

 

[gearcutter]

I know about concavity in relation to a wear phenomenon but I've never heard or seen of an actual specification for it.
What is it and what type of gearing does it relate to?
Is it a type of profile correction such as crowning?


Ron Volmershausen
Brunkerville Engineering
Newcastle Australia

http://www.aussieweb.com.au/email.aspx?id=1194181

 

[dinjin]

Are you asking about internal gear teeth?

 

[leisure17]

or involute tolerance ?

 

[mfgenggear]

Hi All

been very busy today so sorry for the late response.

This is about the profile tolerance. and such.
The only reference I can find is in the AGMA 2015-1-A01
I can not find any info in the AGMA 2000-A88

Profile deviation total
profile tolerance total

profile form deviation
profile form tolerance

profile slope deviation
profile slop tolerance

to my understanding
profile form = concavity
profile slop = error per deg of roll

is there a tolerance for each AGMA Quality class?
for the above profile attributes besides the profile tolerance total.

I could not find any ?

Thanks in Advance
Mfgenggear

 

[tbuelna]

mfgenggear,

The terms I'm familiar with used to describe overall convexity & concavity are fullness/crown & hollow. But these terms are usually related to face profile, and not involute profile. With face profile and lead tolerances it is usually not acceptable to have any hollow condition.

As for involute tooth flanks, the active profile surface naturally has pronounced convexity. The only concavity would be that occurring in the root fillet surface. AGMA 915-1-A02 gives a method for interpreting the involute profile form and slope measurements. The measured profile shape is defined in terms of +/- deviation from a design profile (no slope) and a measured profile mean line (sloped). AGMA 1328-1 gives total profile deviation tolerance limits from the mean for various ISO gear grades in table 3.

Hope that helps.
Terry

 

[mfgenggear]

Terry

I work with many customer drawings that In addition to lead & profile max tolerance do specify fullness tolerance & max error within a degree of roll for profile errors.

I do appreciate the leads & helpfull advice.
I will be ordering the above spec's for my review.

You are a bunch of great guy's & the best of the best.

Thanks

Mfgenggear