FINDING LIMITS FOR TEST RADIUS OF STANDARD GEARS 2

[CAGWU]

GREETINGS,

IF I HAVE A STANDARD SPUR, HOW DO I FIND THE LIMITS FOR THE TEST RADIUS?, WHICH IS 1/2 THE PITCH DIA., AND CAN I USE THE SAME METHOD TO FIND THE LIMITS FOR A STANDARD HELICAL?

 

[Bribyk]

Machinery's Handbook probably has what you're looking for.

Also, all CAPS comes across as yelling.

 

[CAGWU]

Machinery's is coming up a bit short. I know it's related to the backlash and the pitch, just not finding the connection/formula readily available.

(sorry for yelling)

 

[DesignerGuy16]

http://gltrs.grc.nasa.gov/reports/1985/RP-1152.pdf

Try that, it might have what you're looking for.

James Spisich
Design Engineer, CSWP

 

[israelkk]

See AGMA 370.01 handbook page 28 which gives example how to calculate testing radius limits of a standard gear. A long and short addendum gears (corrected gears or profile shifted gears or rack/hob shifted gears as sometimes are called) are not included in this handbook and you need to figure it yourself but be patient, it take time to fully grasp this issue and correctly apply testing radius limits to corrected gears.

You have to understand the double flank rolling test procedures against master gears, tooth thinning, tooth thickness tolerances, AGMA accuracy system, etc.

AGMA 370.01 relates to AGMA 390.03 and AGMA 2000-A88 accuracy system (which is the same as AGMA 390.03 except the addition of metric gears). These standards are no longer the current AGMA accuracy system (which is basically an adaptation of ISO 1328) but you can still purchase them from AGMA and they are much simpler and easier to understand and study.

In time when you will gain more knowledge, understanding, experience and confidense you may consider to move to the current AGMA newer system.

I use AGMA 2000-A88 accuracy system with great success for the last 20 years and I still prefer to use it unless there is a specific demand for the newer AGMA system or the ISO system.

 

[CAGWU]

Thank you both for your post, especially yours, israelkk. I purchased the ANSI B92.1-1996 for an in-depth study on splines. I was hoping to not have to go through the same process, but I can see that I will need to appeal to AGMA to gain a full understanding of the limits and the tooth thickness variance allowed etc. Thanks again to all replies!