Torque specification for setting thread rings vs. "Finger Force" and "Snug"

Charles Harvey

Inactive Registered Visitor
#1
I have a QA tech. who wants to know actual torque specs to define "finger force" and "snug" when setting thread rings. Is anyone familiar with such a specification. I have been setting thread rings for 17 years and have been happily unaware of torque specs for setting thread rings.
 
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A

Al Dyer

#2
Me also, never heard of any spec. Common sense tells me that "finger force" and "snug" are extremely subjective terms that can't be quantified.

Al...
 

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#3
Sorry we missed this thread. Thanks for kicking it up, Al.

Any more takers on Torque specification for setting thread rings vs. "Finger Force" and "Snug"?
 
J

John Nabors - 2009

#4
Charles-

By any chance is this QA tech really green and really, really eager? Eager like a beagle pup going after his first rabbit?

I've always done it by touch. To my (possibly Stone Age) way of thinking, by the time there would be enough drag between the ring and the set plug to register on a torque meter you've already tightened the ring much too far. I'm attaching a pretty decent procedure for setting rings.

Tell your tech that there still are some things that cannot be conveyed by a degree or a certification, only by experience and hands-on training, and setting thread rings is one of them. If you want pure objectivity, buy a Johnson Gage.

Regards -John
 

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Involved In Discussions
#5
I understand the problems. We have 13 different people from 6'3" 285# to 5'3, 110#. Everyone has a different "feel" for what is snug and finger tight. The 3 finger rule doesn't seem to work too well under these conditions since tight is relative to finger strength. :confused:

I suggested a similar idea for torque using in-lbs to my thread supplier and was almost disowned - it doesn't meet the standard. In the mean time I am continually fighting the thread war - goes on this gage, doesn't go on that one. Clear out the inventory and have one person verify/set all of that size.

So, we are starting to look at electronic ID/pitch diameter gages for specific thread sizes as a training tool for setting gages correctly. Set the gage, measure it see how close it is. Repeat until you can hit the size correctly - both pitch diameter and minor diameter. This way we can establish a consistent feel across everyone. Since this is so subjective, the training is something we will have to refresh every couple of months just to ensure continued consistency.

My thread supplier still thinks I'm spitting in the wind,:lmao: but we will see.
 

Wayne

Gage Crib Worldwide
#6
Sorry all. This is not that critical of an issue. The setting of a thread ring gage is a feel thing. If one person has one feel and another has a different feel, it is OK because the actual difference between the two feels is minimal. By minimal. I mean less that the thread gage tolerance. For a 16-TPI thread, the gage tolerance is 0.0003".

Thread set plugs have a similar tolerance. A thread ring gage set with one thread set plug will not fit a different thread set plug, but both thread ring gages are considered to be properly set. The standard states that a part is considered good if a properly set thread ring gage passes the part. If checked with two properly set thread ring gages, and if either thread ring gage passes the part, the part is considered good, even if the other thread ring gage fails the part.

The standard gives lots of room here, because it is not that critical of an issue. Don't work at it so hard. Just meet the intent of the standard and be happy, regardless if you have Betty Boop or Brutus setting your gages.
 
J

John Nabors - 2009

#7
Once again, if your pitch diameter really is that critical, a Johnson Gage will give you objective, variable information.
 

Wayne

Gage Crib Worldwide
#8
Once again, if your pitch diameter really is that critical, a Johnson Gage will give you objective, variable information.
Agreed, a variable type thread comparator will give you some good objective data. There are several good brands of this type of gage: Johnson; Starrett; Southern; MTG; Gagemaker. These are not useful in setting your ring gages. They are only good for checking parts.
 
G

Grizz1345

#9
It amazes me that in our high tech society we depend on feel to set thread ring gage. It is the same when getting thread ring gages re-calibrated. I have found that sending to the original manufacturer means less reworked gages. It all sounds so archaic. Oh well in 5 months I will retire and not have to be concerned about this subject.

Have a great day.
 

Wayne

Gage Crib Worldwide
#10
It amazes me that in our high tech society we depend on feel to set thread ring gage...
Some measurements will require more precision than others. In our high tech society we have the ability to measure the width of a piece of wood with a CMM, but it is still usually measured with a tape rule. The same is true when setting thread ring gages. We have the technology to be more precise, but the level of precision required easily falls within the tolerance variation of feel. To put more effort into the process is wasted dollars.
 
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