How to calculate "Test Radius" for cylinder spur gear ?
How to calculate "Test Radius" for cylinder spur gear ?
(OP)
We need to define the 'test radius'on 2D prints to the supplier.I read the AGMA-2000-A88,It is define the 'maximum and minimum test distance, Cd.'But I still do not know how to calculate the 'test radius',Could you pls help me? Thanks.





RE: How to calculate "Test Radius" for cylinder spur gear ?
Is it a functional radius that must be maintained on the master pinion or cutter in order to check the tif diameter of the parts?
RE: How to calculate "Test Radius" for cylinder spur gear ?
measured gear testing radius = center distance - master gear pitch radius
RE: How to calculate "Test Radius" for cylinder spur gear ?
RE: How to calculate "Test Radius" for cylinder spur gear ?
test radius for
Z2 is 15.885 (0/-0.139)
base radius is 17.13999
Z1 is 3.356 (0/-0.131
base radius is 4.51052
RE: How to calculate "Test Radius" for cylinder spur gear ?
Thank you so much for your reply.from the quantitatively,I believe you are right.But could you pls do me a favour let me know the details of how to calculate it?I can find KissSoft has the function to calculate master gear,but I only have a limit kissSoft license,it is can not active. or maybe you can send email to me'vivific@163.com',thanks a lot.
RE: How to calculate "Test Radius" for cylinder spur gear ?
Maximum and minimum testing radius are measured with master gears in tight mesh on a double flank testing machine.
measured gear testing radius = center distance - master gear pitch radius
This makes sense to me.
Do you have a double flank testing machine or are you sending them out to be checked?
RE: How to calculate "Test Radius" for cylinder spur gear ?
Take a look at AGMA 2002-B88, Section 8.4 "Composite Test Action Measurement". Some of the information was previously in AGMA 370.01 [from 1973], but that spec shows how to calculate the maximum, but does some hand-waving to determine the minimum. AGMA 2002, however, shows how to calculate the maximum and the minimum (the latter of which takes into account tooth thickness tolerance and TCE).
RE: How to calculate "Test Radius" for cylinder spur gear ?
http://www.eng-tips.com/viewthread.cfm?qid=276367
Mfgenggear
RE: How to calculate "Test Radius" for cylinder spur gear ?
That way, the range on CTT should be reduced to compensate for the TCE. So a gear with the max CTT and max TCE would still pass TPR. (Precision Gearing by Michalec has a small section about the ambiguity in correlating MOW and TR measurements on page 567 thru 569). [Figure attached]
(On another note, when I used the numbers in that thread and the appropriate TCE [.0014] for AGMA 9 (i.e. from 390.02), I got the same CTT for the max and min... I don't think that gear has allowance for the tooth thickness to vary.)
RE: How to calculate "Test Radius" for cylinder spur gear ?
yes It was understood that the TCE & CTT are inclusive with the Test Diameter with a know master gear.
I do not have the AGMA 2002-B88 could you please post the formula
of the latest.
Thanks for pointing out the latest
Mfgenggear
RE: How to calculate "Test Radius" for cylinder spur gear ?
You keep coming on this forum asking for help with using KissSoft.
You talk about having a limited licence.
KISS soft's basic gear package will work all this out for you (as it has with other questions you've asked but you just haven't seen it) so I don't understand why you keep coming on here asking these questions.
The only thing that I can see is that you are using an illegal copy of the program and therefore are not able to receive any technical help from KissSoft.
If you are a professional in the gear industry and give advice to your customers, then I would highly recommend that you purchase a legal copy of the software and learn how to use it correctly with the program's designer's help rather than coming on this forum and cheating.
As a professional, the questions you are asking are basic and you should know the answers to them yourself.
If you are having difficulties then I would highly recommend that you engage the help of a professional gear design consultant.
Ron Volmershausen
Brunkerville Engineering
Newcastle Australia
http://www.aussieweb.com.au/email.aspx?id=1194181
RE: How to calculate "Test Radius" for cylinder spur gear ?
Here are the appropriate formulas from AGMA 2002. It also contains a 2nd formula theta_3, but I haven't used it yet. AGMA 2002 is a really good reference to have on your shelf -- it also covers the dimension over pins/MOW.