How to Calibrate or Verify Screw Pitch Gages

Jim Wynne

Staff member
Admin
#11
Re: screw pitch gage

I think the quickest and easiest way is to compare it against a known good gage (read: one that hasn't been abused) with the optical comparator, maybe stack them, mesh the teeth together, or make tracing paper overlays with a pencil and straight edge?
While the method makes sense from a strictly pragmatic point of view, if your customer is expecting NIST-traceability ( which is likely the case if he's asking for pitch gages to be calibrated) you might need to do better than using another pitch gage as a standard. Therein lies the rub--there might not be a traceable standard, and if that's the case there's probably no point in calibration from the customer's POV.
 
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F

fireonce

#12
Re: screw pitch gage

It may not need to be calibrated,
If necessary, it should be calibrated by a specific instrument.
 
3

32BAD45

#13
Got a thread pitch micrometer - need to know if anyone has a procedure or instruction to verify the calibration.

Thanks in advance!


Matt
 

Wayne

Gage Crib Worldwide
#15
...how to calibrate or verify screw pitch gages. Any ideas? My first thought is to slap it on an optical comparator and compare with an overlay- but where do I get do thread pitch overlays (or do they even exist?
I am entering this discussion way late, but here goes anyway.

Screw pitch gages are used by some machinists to verify threads that they have machined. When used in this manor they are referred to as profile gages. They are in common use with American Petroleum Institute (API) threads, and even kept as standard, on-the-shelf, items by two gage makers that I know of. They are available with NIST traceable certifications from the manufacturer.

That said, using a made-in-some-third-world-country, mass-produced, die-stamped, Screw Pitch Gage for cutting threads is a little scarey to me.:mg: I do not see the die stamped tool having much precision, but I still can visualize someone using it to check machined threads. Getting it calibrated may be a good thing for them. It is still cheaper than buying a thread gage. Some days it is anything to save a buck.

As for the optical comparator overlays, if you can define it I can get you an overlay. The design work may take a couple of weeks, or you can supply your own cad files for the overlay company to work from. There are standard screw thread overlays available for about US$130 with a 2 week lead-time. These overlays can be certified. There are four levels of certification and I expect the maximum level has NIST traceability.
 
A

ArlinRL

#16
Re: screw pitch gage

In the manufacturing world, we have to verify that our screw pitch gages are still accurate in order to verify that the parts we purchase meet quality standards and will fit into what we are producing. That said, how can this verification be done? Are there "standards tools" that can be used to verify the accuracy of our measuring gages?
 

Wayne

Gage Crib Worldwide
#17
Re: screw pitch gage

In the manufacturing world, we have to verify that our screw pitch gages are still accurate in order to verify that the parts we purchase meet quality standards and will fit into what we are producing. That said, how can this verification be done? Are there "standards tools" that can be used to verify the accuracy of our measuring gages?
:bigwave: Did you read my reply; the one posted right above this post? I made an attempt to answer this exact question.

:confused: Can you state your question with more specifics and then I can make an answer which may be better tailored for your needs.

:evidence: Can you attach a photo of your 'screw pitch gage' because there may be some difference in definition that a photo will help identify; which will result in a better response to your question.

I will try to help. :cool:
 
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