I want to check 115.92±0.127 mm bore with the help of plug gauge.

Anyone tell me What is dimension should be maintain in Go and NOGO plug gauges?

Tell me what is the tolerance for that?

If you have any standards for gauge design pls let me know.

Thanks in advance your support.

Regards,

Saravanan P.G

Welcome to The Cove Forums!:bigwave:

You may want to search this site for gage design information.

Please keep in mind that Standards are subject to copyright, and may not be requested, nor provided.

Stijloor.

fWIW:
The applicable Standard is probably ANSI B1.2.

Tolerances for each class for plain gages with diameters ranging from 4.510 inches to 6.510 inches are (in inches)
XX = 0.000065
X = 0.00013
Y = 0.00019
Z = 0.00025
ZZ = 0.00050

tolerances apply to actual diameter of plug or ring. The letter symbols are the Standard gage tolerance classes.

One important criterion: Producer and user should agree BEFORE making the product or device to measure the product.

Wayne posted an online calculator for tolerance in this post (http://elsmar.com/Forums/showpost.php?p=241393&postcount=10). Let's wait and see what our Go/Nogo man has to say.

10% Product Tolerance Rule ASME B89.1.5:1998 p 4.1
The 10% product tolerance rule is commonly used in the manufacturing industry. It is considered a "rule-of-thumb" which means that it is a suggestion or a starting point. You, as the engineer, may use the 10% product tolerance rule, or deviate from the 10% product tolerance rule, as long as you can justify your decision to your management.

To calculate the gage tolerance using the 10% product tolerance rule:
1. Calculate the full tolerance of the product feature.
2. Calculate 10% of the product feature tolerance to find the full gage tolerance.
3. Divide the full gage tolerance in half to find the gage member tolerance.
(Otherwise stated: Product Tolerance x 0.05 = Gage Member Tolerance)

Standards that relate to gage design decisions:
ASME B89.7.3.1 Guidelines for Decision Rules: Considering Measurement Uncertainty Determining Conformance to Specifications
ASME B89.1.5 Measurement of Plain External Diameters for use as Master Discs or Cylindrical Plug Gages
ASME B89.1.6 Measurement of Plain Internal Diameters for use as a Master Rings or Ring Gages
These standards are available for purchase from ASME

Cylindrical Gage Tolerance Calculator (http://www.ring-plug-thread-gages.com/ti-Gage-Makers-Tol-Calculator.htm)

Go to the Vermont Gage web site, they have also have a tolerance calculator available.

I want to check 115.92±0.127 mm bore with the help of plug gauge.

Anyone tell me What is dimension should be maintain in Go and NOGO plug gauges?

Tell me what is the tolerance for that?I assume that by now you have used one of the two suggested cylindrical gage tolerance calculators and have gotten your answer.

For those that are interested, the calculators are near identical. The difference between them only lies in that the Vermont Gage calculator needs to be downloaded and installed on your computer while the Gage Crib Worldwide calculator is web based. So depending on your freedom of access to the internet at work, or the strictness of your IT Department, one calculator may work better in your situation than the other.

Saravananpg,
From a GD&T perspective the "GO" device should be a "plug gage" for a hole-like fit... or a "ring" for a shaft-like fit... but the "NO-GO" device should be a "two point" measuring device to detect any discrepancies in the actual "least material condition".
Paul

Hi Saravananpg,

Here are the calculated values for ISO-Gauges.

This is very helpful information. Standard procedure to design ring and plug gage, wanted.

This is very helpful information. Standard procedure to design ring and plug gage, wanted.Hi Nishant;

Because this thread is about plain cylindrical gages, I assume that is your area of interest.

If your interest is in making accurate design drawings of your gages, which is not done very much, you can get the accurate standard sizes of the of the gage blanks and handles from this Gage Makers Supply Catalog (http://www.ring-plug-thread-gages.com/ti-GMS00-Gage-Makers-Supplies-Catalog-Index.htm).

The gage design used in USA is to take the minimum and maximum product limits and use them for your gage limits. Gage tolerances are then applied where the tolerances move toward the product mean.

Gage tolerances are selected by the product engineer to meet the specific requirements of the product. There are several paradigms of gage tolerance determination, but the 10% Tolerance Rule (http://www.ring-plug-thread-gages.com/ti-Gage-Makers-Tol-Calculator.htm#divTOL10) is the most commonly used. To keep the math easy, there is an on-line Gage Makers Tolerance Calculator (http://www.ring-plug-thread-gages.com/ti-Gage-Makers-Tol-Calculator.htm) available.

The GO gage always checks the maximum material condition. The NOGO thus then checks the minimum material condition.

Now let us put it all together for an external product size of: 0.9995"/0.9980", and an internal product size of: 1.0000"/1.0015", using the 10% tolerance rule the gage tolerance would be: X which is equal to 0.00006" (the tolerance value changes as the size changes, see the chart (http://www.ring-plug-thread-gages.com/ti-Gage-Makers-Tol-Calculator.htm)).

The GO ring gage size would be specified as 0.9995" X GO Ring Gage. The actual allowed size for the GO ring gage would be: 0.99950"/0.99944" or more commonly stated: 0.9995"-0.00006".

The NOGO ring gage size would be specified as 0.9980" X NOGO Ring Gage. The actual allowed size for the NOGO ring gage would be: 0.99800"/0.99806" or more commonly stated: 0.9980"+0.00006".

The GO plug gage size would be specified as 1.0000" X GO Plug Gage. The actual allowed size for the GO plug gage would be: 1.00000"/1.00006" or more commonly stated: 1.0000"+0.00006".

The NOGO plug gage size would be specified as 1.0015" X NOGO Plug Gage. The actual allowed size for the NOGO plug gage would be: 1.00150"/1.00144" or more commonly stated: 1.0015"-0.00006".

Is this the information for which you were looking?:)

Hi Wayne,

that you understand with the following question for a plug gage?

Did everyone check the attribute no-go member length on the gages?
Will they reach the part condition?

I appreciated your support

Best regards,

...that you understand with the following question for a plug gage? Did everyone check the attribute no-go member length on the gages? Will they reach the part condition?Fabian;

:confused:I believe that you are questioning the fact that the length of the NOGO gage member is much shorter than the length of the GO gage member. This is true regardless of ring gage or plug gage.

The operative philosophy here is that the GO needs to be of sufficient length to fit well onto/into the test piece while the NOGO is not expected to GO. If the NOGO fits onto/into the test piece beyond a small amount the part is reject. There is no need to fully engage the test piece with the NOGO to declare reject status, thus a shorter NOGO is acceptable and ecologically more acceptable (less use of resources to accomplish the task).

I am not sure that I have answered your question.

DEAR ALL,
PLEASE GUIDE ME WHETHER IT IS COMPULSARRY TO CALIBRATE THE NEW PURCHASE PLAIN PLUG GAUGES(OR ANY OTHER GAUGES) BY THIRD PARTY ? IF YES THEN TELL ME WHY? BECAUSE MANUFACTURER ALERADY PROVIDES CALIBRATION CERTIFICATE WITH NEW GAUGES.

THANKS & REGARDS
:agree:
ANAND

... IS COMPULSARRY TO CALIBRATE THE NEW PURCHASE PLAIN PLUG GAUGES(OR ANY OTHER GAUGES) BY THIRD PARTY? IF YES THEN TELL ME WHY? BECAUSE MANUFACTURER ALERADY PROVIDES CALIBRATION CERTIFICATE WITH NEW GAUGES....Anand;

I would not use the word: COMPULSORY in this situation; rather I would say that it is a darned good idea to double check the gage maker. While gage makers strive not to make mistakes, they too are human and do make them. To blindly trust a single calibration report is to ask for trouble. Someday you will find a gage that has an error and if you find it by inspection before it makes scrap parts, or by customer reject of your parts, is a cost/benefit analysis only you can compute.

I would say that third party inspection is the extreme condition. Review of the gage may be accomplished by your internal laboratory, or a spot check of some features of the gage. One nice thing about a gage maker error is that it is frequently a gross error. Gage makers are usually so focused on the finite that they miss the big picture by a large number, which is easier for you to see, if you look.

The word: COMPULSORY would point to a rule that you are bound to keep. This would be specified in your company quality standards, your customer's requirements, or by some higher level standards organization to which you have a professional/contractual relationship. You will need to look there to answer the question of COMPULSORY.

I hope this information helps.:bigwave: