Plug Gauge design to check 115.92?0.127 mm bore

F

FabianTorres

#11
Re: Plug Gauge design to check 115.92±0.127 mm bore

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,
 
Elsmar Forum Sponsor

Wayne

Gage Crib Worldwide
#12
Re: Plug Gauge design to check 115.92±0.127 mm bore

...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.
 
A

abcauto

#13
Calibration OF NEW PURCHASE PLUG GAUGES?

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
 

Wayne

Gage Crib Worldwide
#14
Re: Calibration OF NEW PURCHASE PLUG GAUGES?

... 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:
 
C

cpbraun

#15
Re: Plug Gauge design to check 115.92±0.127 mm bore

I have a question regarding gage acceptance to "standard gage makers tolerance for plain plug and ring gages". In my facility we order nominal sizes to be used as setting masters for snap and bore gages. When looking over the standard tolerances by class, are they intended to be maximum deviation from nominal or a total tolerance band? In other words, Is the statement of tolerance for a CL-XX ring of 2.500" at 0.00004 meant to be ±0.00004 or ±0.00002 (0.00004 total tolerance band)? Any clarification or elucidation would be welcomed! Thanks!
C Braun
 

Wayne

Gage Crib Worldwide
#16
Gagemaker's Tolerance and it's applied direction

I have a question regarding gage acceptance to "standard gage makers tolerance for plain plug and ring gages". In my facility we order nominal sizes to be used as setting masters for snap and bore gages. When looking over the standard tolerances by class, are they intended to be maximum deviation from nominal or a total tolerance band? In other words, Is the statement of tolerance for a CL-XX ring of 2.500" at 0.00004 meant to be ±0.00004 or ±0.00002 (0.00004 total tolerance band)? Any clarification or elucidation would be welcomed! Thanks!
C Braun;

The direction of tolerance works this way:
XX Master Ring or Master Plug = +/-0.00002"
XX GO Ring Gage = +0.0"/-0.00004"
XX NOTO Ring Gage = +0.00004"/-0.0"
XX GO Plug Gage = +0.00004"/-0.0"
XX NOGO Plug Gage = +0.0"/-0.00004"

NOTE: The value of XX changes as the size changes. See the free-to-use Cylindrical Gage Tolerance Calculator for a detailed chart displaying the tolerance values as they relate to various size diameters.

I hope that this clears up your question.:agree1:
 
Last edited by a moderator:

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#17
Re: Gagemaker's Tolerance and it's applied direction

<snip> The direction of tolerance works this way:
XX Master Ring or Master Plug = +/-0.00002"
XX GO Ring Gage = +0.0"/-0.00004"
XX NOTO Ring Gage = +0.00004"/-0.0"
XX GO Plug Gage = +0.00004"/-0.0"
XX NOGO Plug Gage = +0.0"/-0.00004" <snip>
NOTE: This has been corrected at Wayne's request.
 
G

george22

#18
Re: Plug Gauge design

Please help if you can, I’m sure you might have argued over the “right gage pin method use” not the 10% product tolerance rule. The question is there a standardized method for pin gages on “how to use them”. I have found old reference material from MIL-STD-120.


Thank you,
 

Wayne

Gage Crib Worldwide
#19
Re: Plug Gauge design

Please help if you can, I’m sure you might have argued over the “right gage pin method use” not the 10% product tolerance rule. The question is there a standardized method for pin gages on “how to use them”. I have found old reference material from MIL-STD-120.
George;

:confused: I am a bit confused by your question, so I may state the obvious and just remove these topics from the conversation.

:nope: You are not talking about:
Gage Size (how the gage size is determined)
Gage Tolerance (which gage tolerance paradigm is selected)
Gage Function (I assume you are speaking specifically about GO/NOGO functions)

MIL-STD-120 seems to deal with basic data related to the various styles of gages, including plain plug gages, but not how to use them. The standard is 216 pages long; :read: which paragraph has gotten your attention?

What you are asking about is:
How do you use the gage?
How much force is needed to insert a GO gage?
How far should a NOGO enter?
Should you twist it to make it go in?
Should a Diamond Style NOGO be used?
How often should a gage be used?
How many parts in a lot need to be checked?
Is there a published procedure for using a plain plug gage?

:confused: Are these the type of question you have?
Can you be more specific as to your exact question?
 
G

george22

#20
Re: Plug Gauge design to check 115.92±0.127 mm bore

Yes thats correct: How do you use the gage? Is that standerized somewhere?
 
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