Thread gages -using the NOGO end correctly.

  • Thread starter jane_ackerman - 2010
  • Start date

ScottK

Not out of the crisis
Staff member
Super Moderator
#11
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

Who changed my thread subject name?
I didn't include the last part that states "No-Go end is allowed to enter the part up to 1.5 turns"
I'd appreciate that being removed, as it is not a true statement and I didn't include it in my original post.
Thank you in advance.
mods tend to do that to give as much info as possible in the title.
Don't take it personally, but don't be afraid to question authority either :)
 
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CarolX

Super Moderator
Super Moderator
#12
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

Who changed my thread subject name?
I didn't include the last part that states "No-Go end is allowed to enter the part up to 1.5 turns"
I'd appreciate that being removed, as it is not a true statement and I didn't include it in my original post.
Thank you in advance.
Jane,

We frequently rename thread titles to aid in the search function. If a user comes in looking for no-go gaging on threads and 1.5 turns , they will be directed to this excellent thread.

My appologies if you were offended.

I do thank you for an excellent thread. A lot of great information in your original post.
 

Jim Wynne

Staff member
Admin
#13
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

Jane,

We frequently rename thread titles to aid in the search function. If a user comes in looking for no-go gaging on threads and 1.5 turns , they will be directed to this excellent thread.
But if such a search would still find this thread, even if the title hadn't been changed, no?
 
J

jane_ackerman - 2010

#14
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

Perhaps it could be changed to reflect that the "no-go end may enter based on the thread type"?
Just a thought... to make it more of a true statement.
Thanks.
 
Last edited by a moderator:

Jim Wynne

Staff member
Admin
#15
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

Perhaps it could be changed to reflect that the "no-go end may enter based thread type"?
Just a thought... to make it more of a true statement.
Thanks.
I think perhaps a question mark at the end might clear it up.
 

Wes Bucey

Quite Involved in Discussions
#16
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

Get me a consensus of what you want the thread title to be and I will change it to reflect the consensus opinion.

How about "ANSI Unified thread plug gage - How many turns allowed for no-go end?" (Confirm we refer to ANSI Unified thread?) There is a Standard ANSI B 1.2.

My 23rd edition of Machinery's Handbook says (p1642) "NOT GO (H1) Thread Plug Gages. NOT GO (H1) thread plug gages when applied to the product thread may engage only the end threads (which may not be representative of the complete thread.) [deleted for space] . . . acceptable when the NOT GO (H1) thread plug gage applied to the product internal thread does not enter more than three complete turns. The gage should not be forced. Special requirements such as exceptionally thin or ductile material, small number of threads, etc., may necessitate modification of this practice."
 
H

H. Majhenich

#17
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

We make precision parts in our plant. Some of our parts have threads only 1-3 turns long. The 'Nogo' must not go in at all. I would think that it is all a matter of common sense, w/ the max of 3 turns on larger parts.
 

Wayne

Gage Crib Worldwide
#18
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

... I've always contended that "industry standards" that aren't officially codified and controlled, (A) can't be referenced on a drawing and (B) are generally useless. ...
Jim, I assume that when you speak of “industry standards” not being officially codified and controlled, you are speaking of the unofficial rule-of-thumb, not the ANSI/ASME/ISO/SAE standards. These are codified, can be controlled and are referenced on drawings.
 

Jim Wynne

Staff member
Admin
#19
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

Jim, I assume that when you speak of “industry standards” not being officially codified and controlled, you are speaking of the unofficial rule-of-thumb, not the ANSI/ASME/ISO/SAE standards. These are codified, can be controlled and are referenced on drawings.
I understand, hence the scare quotes around "industry standards."
 

Wayne

Gage Crib Worldwide
#20
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

Get me a consensus of what you want the thread title to be... How about "ANSI Unified thread plug gage - How many turns allowed for no-go end?" (Confirm we refer to ANSI Unified thread?) There is a Standard ANSI B 1.2. My 23rd edition of Machinery's Handbook says...
The current edition of the Machinery’s Handbook is the 27th. How old is that 23rd edition?

As for the standard being discussed, yes, one gaging requirement for the Unified Thread is specified in ANSI B1.2, but the gaging requirement is also specified in BS 919; JIS B 0255; JIS B 0256; SAA AS 3635; and an ISO standard that I can not identify at the moment. Then there is a similar list of requirements for NPT, NPTF, ANPT, BSPP, BSPT, ACME, Buttress, Metric, Whitworth, Trapezoidal and other threads.

Use requirements for thread gages vary based on the standard that defines them. When a part is designed, the standard requirements for the threads should be stated on the print. Gray areas in the standard, if critical, need to be further defined on the print. I believe that, if you check the wording in the ANSI B1.2, for example, you will find wording defining the use of the NOGO gage which states something to the effect of: Shall not enter the part not more than 1-1/2 to 3 turns, unless otherwise specified by the customer. This wording covers short parts or long parts or specific product requirements not obvious to the maker of the component part, as long as engineers fully define the component requirements, and quality professionals review the standards for their specific idiosyncrasies.
 
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