Thread gages -using the NOGO end correctly.

  • Thread starter jane_ackerman - 2010
  • Start date

Wes Bucey

Quite Involved in Discussions
#21
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

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 idiosyncrasy.
Absolutely, Wayne! I'm old, semi-retired and rarely have need for a more recent version when many things are available via internet. I think I may have some editions in boxes in the garage which go back to the 60's and 70's! Hence my mention of WHICH edition!

The operative phrasing throughout the years has always been some version of "use common sense! If you have only 2 threads in a thin sheet metal panel, reference to three threads is invalid."
 
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Wayne

Gage Crib Worldwide
#22
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

Jim & Wes,
What are you guys doing up so late. I thought it would be hours before you caught my remarks.:D You guys are fast!:applause: I don't intend to offend, I just have never learned how to be socially appropriate.:eek:
 
J

jane_ackerman - 2010

#23
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

WOW! This has turned into an awesome discussion!!!
Thanks so much to all of you who have done some research and provided the quotes and sources.

Wes,
Since there are various standards based on thread type, how about simply:
"Thread Gages - How many turns allowed for no-go end?"

Again, a huge thanks to all who have provide input.
Jane
 

Charles Harvey

Inactive Registered Visitor
#24
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

I looked this up in my copy of the ANSI/ASME B1.2-1983 std. It appears that Wes's quote from the Machinery Handbook of several days ago is a direct quote of section 4.2.1 (page 13) of B1.2-1983. The wording is identical.
 

Wes Bucey

Quite Involved in Discussions
#25
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

WOW! This has turned into an awesome discussion!!!
Thanks so much to all of you who have done some research and provided the quotes and sources.

Wes,
Since there are various standards based on thread type, how about simply:
"Thread Gages - How many turns allowed for no-go end?"

Again, a huge thanks to all who have provide input.
Jane
How about
"Thread gages - using the no-go end correctly"?
 
J

jane_ackerman - 2010

#26
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

That works for me.
Thanks
 
M

M Greenaway

#27
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

Just to add to the confusion.....

I recall being taught that all the stress in a thread is handled by the first 3 pitches, hence allowing this to go oversize one would imagine would weaken the strength of the fastener ??

Maybe ??
 
J

jeremyridley

#28
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

New to this forum...My company just got me a Pratt & Whitney Super Mic to bring our calibration back in house. I have procedures for just about every thing I need except NPTF plugs. I know I have to measure pitch diameter at the gaging notch, and major at the small end. I have a 3/4 TPF master and flat tapered probes. Is there anything fundamentally wrong with what I have so far? What is the Measure Over Wire formula? What else is needed to be able to certify this gage? I already have the pipe thread standards. I would greatly appreciate the help with this.
 

Stijloor

Staff member
Super Moderator
#29
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

New to this forum...My company just got me a Pratt & Whitney Super Mic to bring our calibration back in house. I have procedures for just about every thing I need except NPTF plugs. I know I have to measure pitch diameter at the gaging notch, and major at the small end. I have a 3/4 TPF master and flat tapered probes. Is there anything fundamentally wrong with what I have so far? What is the Measure Over Wire formula? What else is needed to be able to certify this gage? I already have the pipe thread standards. I would greatly appreciate the help with this.
Hello Jeremy! Welcome to The Cove Forums. :bigwave: :bigwave:

It is weekend and I am sure that the Metrology/Calibration experts here at The Cove will respond next week.

Look at this thread: "How to properly check (British Standard) threads?"

This thread has some good posts and other links to topics that may be of interest to you.

I hope this helps you to get started.

Stijloor.
 

Wayne

Gage Crib Worldwide
#30
Re: Thread Gage - No-Go end - No-Go end is allowed to enter the part up to 1.5 turns

How about
"Thread gages - using the no-go end correctly"?
Wes, I see that the name of this thread has not been changed. :agree1:Your suggestion: "Thread gages -using the NOGO end correctly." is good for the preceding discussion; however; the discussion of pipe gage calibration really needs its own thread.
 
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